**MECHANICAL ENGINEERING- PAGE 2**

**Mechanical Engineering MCQs- Page 2**

1:-If Poisson's ration for a material is 0.5, then the elastic modulus for material is

A:-Three times its shear modulus

B:-Four times its shear modulus

C:-Equal to its shear modulus

D:-Indeterminate

Ans: A

2:-Production cost refers to prim cost plus

A:-Factory overheads

B:-Factory and administration overheads

C:-Factory, administration and sales overheads

D:-Factory, administration and sales overheads and profit

Ans: A

3:-In a CNC program block, N002 G03 G91 X40 Z40....,G02 and G91 refer to

A:-Circular interpolation in counter clockwise direction and incremental dimension

B:-Circular interpolation in counter clockwise direction and absolute dimension

C:-Circular interpolation in clockwise direction and incremental dimension

D:-Circular interpolation in clockwise direction and absolute dimension

Ans: A

4:-If the arrival takes place every 10 minutes with a service time of 4 minutes per unit then the mean arrival rate, mean service rate and the probability that one would have to wait will he respectively

A:-10, 4 and 0.25

B:-0.1, 0.25 and 0.4

C:-10, 0.4 and 0.25

D:-0.1, 0.25 and 0.1

Ans: B

5:-It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 rpm, then the speed of the lead screw will be the material is rigid

A:-10 rpm

B:-120 rpm

C:-20 rpm

D:-180 rpm

Ans: C

6:-For adiabatic expansion with friction through a nozzle, the following remains constant

A:-Stagnation enthalpy

B:-Entropy

C:-Static enthalpy

D:-Stagnation pressure

Ans: A

7:-A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mk. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mk and thickness

A:-0.05 m

B:-0.1 m

C:-0.2 m

D:-0.5 m

Ans: B

8:-A heat exchanger with heat transfer surface area `A` and overall transfer coefficient `U` handles two fluids of heat capacitors `"C_{max}"` and `"C_{min}"` . The parameter NTU (number of transfer units) used in the analysis of heat exchanger is specified as

A:-`(AC_min)/(U)`

B:-`(U)/(AC_min)`

C:-`AUC_min`

D:-`(AU)/(C_min)`

Ans: D

9:-Effective temperature is that temperature of saturated air which gives the same degree of comfort as the air at given

A:-DBT, WBT and incidental solar radiation

B:-WBT, incidental solar radiation and air flow rate

C:-DBT, solar temperature and air flow rate

D:-DBT, WBT and air flow rate

Ans: D

10:-In a saturated air-water vapour mixture, the

A:-Dry bulb temperature is higher than the wet bulb temperature

B:-Dew point temperature is lower than the wet bulb temperature

C:-Dry bulb, wet bulb and dew point temperature are the same

D:-Dry bulb temperature is higher than the dew point temperature

Ans: C

11:-The value engineering technique in which experts of the same rank assemble for product development is called

A:-Delphi

B:-Brain storming

C:-Morphological analysis

D:-Direct expert comparison

Ans: B

12:-A gas engine has a swept volume of 300 cc and clearance volume of 25 cc. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. What is the volume to the mixture taken in, per stroke?

A:-248 cc

B:-252 cc

C:-264 cc

D:-286 cc

Ans: C

13:-In time study, the rating factor is applied to determine

A:-Standard time of a job

B:-Merit rating of the worker

C:-Fixation of incentive rate

D:-Normal time of job

Ans: B

14:-In Manufacturing management, the term ''Dispatching'' is used to describe

A:-Dispatch of sales order

B:-Dispatch of factory mail

C:-Dispatch of finished product to the user

D:-Dispatch of work orders through shop floor

Ans: D

15:-A slender shaft supported on two bearings at its ends carries a disc with an eccentricity ''e'' from the axis of rotation. The critical speed of the shaft is N. If the disc is replaced by a second one of same weight but mounted with an eccentricity ''2e''. Critical speed of the shaft in the second case is

A:-`(N)/(2`

B:-`(N)/(sqrt(2))`

C:-`N`

D:-`2N `

Ans: B

16:-The gear train usually employed in clocks is a

A:-reverted gear train

B:-simple gear train

C:-sun and planet gear

D:-differential gear

Ans: A

17:-Group technology brings together and organizes

A:-Part and simulation analysis

B:-Documentation and analysis

C:-Automation and tool production

D:-Common parts, problems and tasks

Ans: D

18:-The function of shackle with a leaf spring is to

A:-allow the spring length to change

B:-allow pivoting of spring end

C:-provide good traction

D:-Prevent squeaking sound

Ans: A

19:-The curve shown in the given figure below is a characteristic of diesel engines. What does the Y-axis represent?

A:-Efficiency

B:-Specific fuel consumption

C:-Air-fuel ratio

D:-Total fuel consumption

Ans: D

20:-The equation given below represents `m (d^2x)/(dt^2) +c(dx)/(dt) + kx =0`

A:-free vibrations

B:-forced vibrations

C:-periodically forced vibrations

D:-free vibrations with viscous damping

Ans: D

A:-Three times its shear modulus

B:-Four times its shear modulus

C:-Equal to its shear modulus

D:-Indeterminate

Ans: A

2:-Production cost refers to prim cost plus

A:-Factory overheads

B:-Factory and administration overheads

C:-Factory, administration and sales overheads

D:-Factory, administration and sales overheads and profit

Ans: A

3:-In a CNC program block, N002 G03 G91 X40 Z40....,G02 and G91 refer to

A:-Circular interpolation in counter clockwise direction and incremental dimension

B:-Circular interpolation in counter clockwise direction and absolute dimension

C:-Circular interpolation in clockwise direction and incremental dimension

D:-Circular interpolation in clockwise direction and absolute dimension

Ans: A

4:-If the arrival takes place every 10 minutes with a service time of 4 minutes per unit then the mean arrival rate, mean service rate and the probability that one would have to wait will he respectively

A:-10, 4 and 0.25

B:-0.1, 0.25 and 0.4

C:-10, 0.4 and 0.25

D:-0.1, 0.25 and 0.1

Ans: B

5:-It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 rpm, then the speed of the lead screw will be the material is rigid

A:-10 rpm

B:-120 rpm

C:-20 rpm

D:-180 rpm

Ans: C

6:-For adiabatic expansion with friction through a nozzle, the following remains constant

A:-Stagnation enthalpy

B:-Entropy

C:-Static enthalpy

D:-Stagnation pressure

Ans: A

7:-A furnace is made of a red brick wall of thickness 0.5 m and conductivity 0.7 W/mk. For the same heat loss and temperature drop, this can be replaced by a layer of diatomite earth of conductivity 0.14 W/mk and thickness

A:-0.05 m

B:-0.1 m

C:-0.2 m

D:-0.5 m

Ans: B

8:-A heat exchanger with heat transfer surface area `A` and overall transfer coefficient `U` handles two fluids of heat capacitors `"C_{max}"` and `"C_{min}"` . The parameter NTU (number of transfer units) used in the analysis of heat exchanger is specified as

A:-`(AC_min)/(U)`

B:-`(U)/(AC_min)`

C:-`AUC_min`

D:-`(AU)/(C_min)`

Ans: D

9:-Effective temperature is that temperature of saturated air which gives the same degree of comfort as the air at given

A:-DBT, WBT and incidental solar radiation

B:-WBT, incidental solar radiation and air flow rate

C:-DBT, solar temperature and air flow rate

D:-DBT, WBT and air flow rate

Ans: D

10:-In a saturated air-water vapour mixture, the

A:-Dry bulb temperature is higher than the wet bulb temperature

B:-Dew point temperature is lower than the wet bulb temperature

C:-Dry bulb, wet bulb and dew point temperature are the same

D:-Dry bulb temperature is higher than the dew point temperature

Ans: C

11:-The value engineering technique in which experts of the same rank assemble for product development is called

A:-Delphi

B:-Brain storming

C:-Morphological analysis

D:-Direct expert comparison

Ans: B

12:-A gas engine has a swept volume of 300 cc and clearance volume of 25 cc. Its volumetric efficiency is 0.88 and mechanical efficiency is 0.90. What is the volume to the mixture taken in, per stroke?

A:-248 cc

B:-252 cc

C:-264 cc

D:-286 cc

Ans: C

13:-In time study, the rating factor is applied to determine

A:-Standard time of a job

B:-Merit rating of the worker

C:-Fixation of incentive rate

D:-Normal time of job

Ans: B

14:-In Manufacturing management, the term ''Dispatching'' is used to describe

A:-Dispatch of sales order

B:-Dispatch of factory mail

C:-Dispatch of finished product to the user

D:-Dispatch of work orders through shop floor

Ans: D

15:-A slender shaft supported on two bearings at its ends carries a disc with an eccentricity ''e'' from the axis of rotation. The critical speed of the shaft is N. If the disc is replaced by a second one of same weight but mounted with an eccentricity ''2e''. Critical speed of the shaft in the second case is

A:-`(N)/(2`

B:-`(N)/(sqrt(2))`

C:-`N`

D:-`2N `

Ans: B

16:-The gear train usually employed in clocks is a

A:-reverted gear train

B:-simple gear train

C:-sun and planet gear

D:-differential gear

Ans: A

17:-Group technology brings together and organizes

A:-Part and simulation analysis

B:-Documentation and analysis

C:-Automation and tool production

D:-Common parts, problems and tasks

Ans: D

18:-The function of shackle with a leaf spring is to

A:-allow the spring length to change

B:-allow pivoting of spring end

C:-provide good traction

D:-Prevent squeaking sound

Ans: A

19:-The curve shown in the given figure below is a characteristic of diesel engines. What does the Y-axis represent?

A:-Efficiency

B:-Specific fuel consumption

C:-Air-fuel ratio

D:-Total fuel consumption

Ans: D

20:-The equation given below represents `m (d^2x)/(dt^2) +c(dx)/(dt) + kx =0`

A:-free vibrations

B:-forced vibrations

C:-periodically forced vibrations

D:-free vibrations with viscous damping

Ans: D

21:-Morse test is conducted to find

A:-Brake power of a single cylinder engine

B:-Indicated power of a single cylinder engine

C:-Indicated power of a multi-cylinder engine

D:-Frictional power of a single cylinder engine

Ans: C

22:-Relationship between shear stress, velocity gradient and dynamic viscosity of a fluid is

A:-Velocity gradient = shear stress * dynamic viscosity

B:-Dynamic viscosity = shear stress * velocity gradient

C:-Velocity gradient = shear stress / dynamic viscosity

D:-Shear stress = velocity gradient * dynamic viscosity

Ans: D

23:-For stability of the floating body meta-centric height must be

A:-Below the centre of gravity

B:-Above the centre of gravity

C:-Meta centre and centre of gravity must coincided

D:-Must be in same horizontal plane

Ans: B

24:-Compression ratio is of a reciprocating compressor id defined as

A:-volume after compression to volume before compression

B:-Pressure before compression to pressure after compression

C:-pressure after compression to pressure before compression

D:-Volume before compression to volume after compression

Ans: D

25:-In a hole basis system of fit

A:-The fundamental deviation of hole is not zero

B:-The fundamental deviation of shaft is zero

C:-The fundamental deviation of hole is zero

D:-None of the above

Ans: C

26:-Bernoulli's equation represents the

A:-Forces at any point in the field and obtained by integrating the momentum equation for viscous flows

B:-Energies in any point in the flow field and is obtained by integrating the Euler equation

C:-Momentum at any point in the flow field and is obtained by integrating continuity equation

D:-Moment of momentum and is obtained by integrating the energy equation

Ans: B

27:-Property of the material which enable is to absorb energy without fracture is known as

A:-Hardness

B:-Toughness

C:-Brittleness

D:-All the above

Ans: B

28:-Which of the following tool material retain their hot hardness at highest temperature?

A:-Carbide

B:-Cermets

C:-Ceramic

D:-Borazon

Ans: D

29:-Herringbone gears are used to

A:-To counter balance the end thrust

B:-To increase axial thrust

C:-Connect two non-intersecting shafts

D:-None of these

Ans: A

30:-Provision of fins on a given heat transfer surface will be more if there are

A:-Fewer number of thick fins

B:-Fewer number of thin fins

C:-Large number of thin fins

D:-Large number of thick fins

Ans: C

31:-A good refrigerant should have

A:-High latent heat of vaporization and low freezing point

B:-High operating pressure and freezing point

C:-High specific volume and high latent heat of vaporization

D:-Low COP and low freezing point

Ans: A

32:-In value engineering the term value refers to

A:-Relation between function and cost

B:-Relation between cost and efficiency

C:-Market Value

D:-Relation between productivity and cost

Ans: A

33:-Which of the following plans guarantee minimum wage to a works and bonus based on fixed percentage of time saved?

A:-Gantt plan

B:-Halsey plan

C:-Powan plan

D:-Bedaux plan

Ans: C

34:-Addition of which of the following improves machining of copper?

A:-Sulphur

B:-Vanadium

C:-Tin

D:-Zinc

Ans: A

35:-The curve traced by a point on the circumference of a circle which rolls along the inside of a fixed circle is known as

A:-Epicycloids

B:-Hypocycloid

C:-Cardioids

D:-Involutes

Ans: B

36:-In gear hobbing

A:-Only hob rotates

B:-Only gear blank

C:-Both hob and gear blank rotate

D:-Neither hob nor gear blank rotates

Ans: C

37:-The buckling load will be maximum for a column if

A:-One end of the column is clamped and the other end is free

B:-Both ends of the column are clamped

C:-Both ends of the column are hinged

D:-One end of the column is hinged and the other end is free

Ans: B

38:-Reference fuels for knock rating of SI engine fuels would include

A:-Iso-octane and alpha methyl naphthalene

B:-Normal octane and aniline

C:-Iso-octane and n-hexane

D:-n-heptane and iso-octane

Ans: D

39:-If speed of a centrifugal pump is doubled, then

A:-Power required to operate it is doubled

B:-The volumetric discharge is increased 4 times

C:-The head becomes 4 times as great

D:-Specific speed becomes 4 times

Ans: C

40:-If the depth of a rectangular beam is halved the deflection for a beam carrying a mid point load shall be

A:-Halved

B:-Doubled

C:-Four times

D:-Eight times

Ans: D

A:-Brake power of a single cylinder engine

B:-Indicated power of a single cylinder engine

C:-Indicated power of a multi-cylinder engine

D:-Frictional power of a single cylinder engine

Ans: C

22:-Relationship between shear stress, velocity gradient and dynamic viscosity of a fluid is

A:-Velocity gradient = shear stress * dynamic viscosity

B:-Dynamic viscosity = shear stress * velocity gradient

C:-Velocity gradient = shear stress / dynamic viscosity

D:-Shear stress = velocity gradient * dynamic viscosity

Ans: D

23:-For stability of the floating body meta-centric height must be

A:-Below the centre of gravity

B:-Above the centre of gravity

C:-Meta centre and centre of gravity must coincided

D:-Must be in same horizontal plane

Ans: B

24:-Compression ratio is of a reciprocating compressor id defined as

A:-volume after compression to volume before compression

B:-Pressure before compression to pressure after compression

C:-pressure after compression to pressure before compression

D:-Volume before compression to volume after compression

Ans: D

25:-In a hole basis system of fit

A:-The fundamental deviation of hole is not zero

B:-The fundamental deviation of shaft is zero

C:-The fundamental deviation of hole is zero

D:-None of the above

Ans: C

26:-Bernoulli's equation represents the

A:-Forces at any point in the field and obtained by integrating the momentum equation for viscous flows

B:-Energies in any point in the flow field and is obtained by integrating the Euler equation

C:-Momentum at any point in the flow field and is obtained by integrating continuity equation

D:-Moment of momentum and is obtained by integrating the energy equation

Ans: B

27:-Property of the material which enable is to absorb energy without fracture is known as

A:-Hardness

B:-Toughness

C:-Brittleness

D:-All the above

Ans: B

28:-Which of the following tool material retain their hot hardness at highest temperature?

A:-Carbide

B:-Cermets

C:-Ceramic

D:-Borazon

Ans: D

29:-Herringbone gears are used to

A:-To counter balance the end thrust

B:-To increase axial thrust

C:-Connect two non-intersecting shafts

D:-None of these

Ans: A

30:-Provision of fins on a given heat transfer surface will be more if there are

A:-Fewer number of thick fins

B:-Fewer number of thin fins

C:-Large number of thin fins

D:-Large number of thick fins

Ans: C

31:-A good refrigerant should have

A:-High latent heat of vaporization and low freezing point

B:-High operating pressure and freezing point

C:-High specific volume and high latent heat of vaporization

D:-Low COP and low freezing point

Ans: A

32:-In value engineering the term value refers to

A:-Relation between function and cost

B:-Relation between cost and efficiency

C:-Market Value

D:-Relation between productivity and cost

Ans: A

33:-Which of the following plans guarantee minimum wage to a works and bonus based on fixed percentage of time saved?

A:-Gantt plan

B:-Halsey plan

C:-Powan plan

D:-Bedaux plan

Ans: C

34:-Addition of which of the following improves machining of copper?

A:-Sulphur

B:-Vanadium

C:-Tin

D:-Zinc

Ans: A

35:-The curve traced by a point on the circumference of a circle which rolls along the inside of a fixed circle is known as

A:-Epicycloids

B:-Hypocycloid

C:-Cardioids

D:-Involutes

Ans: B

36:-In gear hobbing

A:-Only hob rotates

B:-Only gear blank

C:-Both hob and gear blank rotate

D:-Neither hob nor gear blank rotates

Ans: C

37:-The buckling load will be maximum for a column if

A:-One end of the column is clamped and the other end is free

B:-Both ends of the column are clamped

C:-Both ends of the column are hinged

D:-One end of the column is hinged and the other end is free

Ans: B

38:-Reference fuels for knock rating of SI engine fuels would include

A:-Iso-octane and alpha methyl naphthalene

B:-Normal octane and aniline

C:-Iso-octane and n-hexane

D:-n-heptane and iso-octane

Ans: D

39:-If speed of a centrifugal pump is doubled, then

A:-Power required to operate it is doubled

B:-The volumetric discharge is increased 4 times

C:-The head becomes 4 times as great

D:-Specific speed becomes 4 times

Ans: C

40:-If the depth of a rectangular beam is halved the deflection for a beam carrying a mid point load shall be

A:-Halved

B:-Doubled

C:-Four times

D:-Eight times

Ans: D

41: Manufacturing of a product requires fixed investment of Rs 1,20,000 in a particular year. The estimated sales for this period is 4,00,000 units. The variable cost per unit product is Rs 6. Determine the break even point of production if unit price of product is

Rs 30.

A 2000

B 3000

C 5000

D 10000

Ans: C

42: The sale of cycles in a shop in four consecutive months are 70,68,82 & 95. Exponentially smoothing average method with a smoothing factor of 0.4 is used in forecasting. The expected number of sales of cycles in the next (i.e. 5th) month is

A 73.52

B 37.25

C 36.76

D 18.38

Ans: A

43: When 3-2-1 principal is used to support and locate a three dimensional work piece during machining, the number of degree of freedom that are restricted is

A 7

B 8

C 9

D 10

Ans: C

44: In MRP system, component demand is

A Forecasted

B Established by the master production schedule

C Calculated by the MRP system for the master production schedule

D Ignored

Ans: C

44: The maximum level of inventory of an item is 100 and it is achieved with infinite replenishment rate. The inventory becomes Zero over one and half month due to consumption at a uniform rate. This cycle continues throughout the year. Ordering cost is Rs. 100 per order and inventory carrying cost is Rs. 10 per item per month. Annual cost (Rs.) of the plan, neglecting the material cost is

A 1200

B 2400

C 4800

D 6800

Ans: C

45: In PERT analysis, a critical activity has

A Maximum float

B Zero float

C Maximum cost

D Minimum cost

Ans: B

46: A project has six activities (A to F) with respective activity durations 7,5,6,6,8,4 days. The network has three paths A-B, C-D, and E-F. All the activities can be crashed with the same crash cost per day. The number of activities that need to be crushed to reduce the project duration by one day is

A 1

B 2

C 3

D 6

Ans: C

47: A heat pump is used to heat a house in winter and then reversed to cool in the summer. The inside temperature of the house is to be maintained at 20 degree C. The heat transfer through the house walls is 7.9 kJ/s and the outside temperature in winter is 5 degree C. Calculate the approximate minimum power required to drive the heat pump.

A 101.11 W

B 202.22 W

C 303.33 W

D 404.44 W

Ans: D

48: If a closed system is undergoing an irreversible process, the entropy of the system

A Must increase

B Always remains constant

C Must decrease

D May increase or decrease

Ans: D

49: Heat and work are

A Intensive properties

B Extensive properties

C Point functions

D Path functions

Ans: D

50: A single acting two-stage compressor with complete inter cooling delivers air at 16 bar. Assuming an intake stage of 1 bar at 15 degree

C, the pressure ratio per stage is

A 16

B 8

C 4

D 2

Ans: C

51: In a gas turbine cycle, the turbine output is 600 kJ/kg, the compressor work is 400 kJ/kg and the heat supplied is 1000 kJ/kg. The

thermal efficiency of cycle is

A 80%

B 60%

C 40%

D 20%

Ans: D

52: A gas turbine works on which one of the following cycles?

A Brayton

B Rankine

C Stirling

D Otto

Ans: A

53: A circular annular plate having outer and inner diameter of 2.5 m and 1.25 m respectively, is immersed in water with its plane making an angle of 45 degree with the horizontal. The center of circular annular plate is 2.0 m below the free surface. What is the hydrostatic thrust on one side of the plate?

A 72.2 kN

B 36.1 kN

C 18.1 kN

D 144.4 kN

Ans: A

54: A pitot tube is used to measure the velocity of air having density 1.2 kg/m3 .At a point, the difference in the stagnation and static

pressures of a pitot(static) tube is found to be 450 Pa. Determine the velocity of air at the point in m/s.

A 27.38 m/s

B 18.69 m/s

C 9.34 m/s

D 54.76 m/s

Ans: A

55: For the stability of a floating body, under the influence of gravity alone, which of the following is true?

A Metacentre should be below center of gravity

B Metacentre should be above center of gravity

C Metacentre and center of gravity must lie on same horizontal line.

D Metacentre and center of gravity must lie on the same vertical line.

Ans: B

56: A U-tube open on both ends and made of 8 mm diameter glass tube has mercury up to a height of 10 cm in both the limbs. If 19 cm3 of water is added to one of the limbs, what is the approximate difference in mercury level in the two limbs at equilibrium?

A 4.5 mm

B 1.0 mm

C 2.8 mm

D 3.2 mm

Ans: C

57: An aeroplane is cruising at a speed of 750 kmph at an altitude, where the air temperature is 5oC. Calculate the flight Mach

number at this speed.

A 0.31

B 0.62

C 0.93

D None of these

Ans: B

58: An impulse turbine has nozzle efficiency 0.85, blade velocity ratio 0.6 and mean blade velocity 225 m/s. calculate the isentropic

heat (in kJ/kg) drop in the nozzle.

A 41.36 kJ/kg

B 82.72 kJ/kg

C 20.68 kJ/Kg

D 62.04 kJ/kg

Ans: B

59: In order to have maximum power from a Pelton turbine, the bucket speed must be

A Equal to the jet speed

B Equal to half of jet speed

C Equal to twice of jet speed

D Equal to three time of jet speed

Ans: B

60: A moist air is maintained at 1 bar such that its dry bulb temperature is 20 deg C and dew point temperature is 5 deg C.The values of

saturation pressure of steam at 20 deg C & 5 deg C are 0.02339 bar and 0.00872 bar, respectively. Calculate the relative humidity of the

moist air.

A 37.28%

B 36.7%

C 18.2%

D None of these

Ans: A

61: A furnace is made of a red brick wall of thickness 250cm and conductivity 1.2 W/mK. Determine the thickness of a layer of diatomic earth of conductivity 0.15 W/mK that can be used to replace the brick wall for the same heat loss and temperature drop.

A 3.12 cm

B 6.24 cm

C 9.36 cm

D 12.48 cm

Ans: A

62: A wire of 18mm diameter is exposed to air where convective heat transfer coefficient is h = 25 W/m2K. The wire is to be laid with an insulating layer of thermal conductivity 0.6 W/mK. Determine the thickness of the insulation for the maximum heat dissipation

A 5 mm

B 10 mm

C 15 mm

D 20 mm

Ans: C

63: Determine the heat transfer coefficient from a 120 mm diameter steel pipe placed horizontally in ambient at 25 deg C. Nusselt number is 30 and thermal conductivity of air is 0.05 W/mK.

A 12.5 W/m2K

B 5.0 W/m2K

C 15.2 W/m2K

D 20.0 W/m2K

Ans: A

64: A fin has 5 mm diameter and 100 mm length. The thermal conductivity of fin material is 400 W/mK. One end of the fin is maintained at 130 deg C and its remaining surface is exposed to ambient air at 30 deg C. If the convective heat transfer coefficient is 40 W/m2K, the heat loss (W) from the fin is:

A 0.08

B 5.02

C 7.02

D 7.82

Ans: C

65: In an condenser of a power plant, the steam condenses at a temp of 60 deg C. The cooling water enters at 30 deg C and leaves at 45 deg C. LMTD of the condenser is

A 16.2 deg C

B 21.6 deg C

C 30 deg C

D 37.5 deg C

Ans: B

66: A moist air sample has dry bulb temperature of 30 deg C and specific humidity of 11.5 g water vapour per kg dry air.Assume molecular weight of air as 28.93. If the saturation vapour pressure of water at 30 deg C is 4.24 kPa and total pressure is 90kPa, then the relative humidity (%) of air sample is

A 50.5

B 38.5

C 56.5

D 68.5

Ans: B

67: If a mass of moist air in airtight vessel is heated to a higher temperature, then

A Specific humidity of air increases

B Specific humidity of air decreases

C Relative humidity of air increases

D Relative humidity of air decreases

Ans: D

68. A shaft rotating at N=420 rpm is supported by a thrust bearing having external and internal diameter do = 400 mm & di = 240 mm, respectively. Axial load on the bearing is W=150 kN while the intensity of pressure is limited to p=325 kN/m2 . Determine the power lost in overcoming the friction if the coefficient of friction is µ= 0.05 .

A 53.87 kW

B 35.78 kW

C 200.12 kW

D 135.41 kW

Ans: A

Rs 30.

A 2000

B 3000

C 5000

D 10000

Ans: C

42: The sale of cycles in a shop in four consecutive months are 70,68,82 & 95. Exponentially smoothing average method with a smoothing factor of 0.4 is used in forecasting. The expected number of sales of cycles in the next (i.e. 5th) month is

A 73.52

B 37.25

C 36.76

D 18.38

Ans: A

43: When 3-2-1 principal is used to support and locate a three dimensional work piece during machining, the number of degree of freedom that are restricted is

A 7

B 8

C 9

D 10

Ans: C

44: In MRP system, component demand is

A Forecasted

B Established by the master production schedule

C Calculated by the MRP system for the master production schedule

D Ignored

Ans: C

44: The maximum level of inventory of an item is 100 and it is achieved with infinite replenishment rate. The inventory becomes Zero over one and half month due to consumption at a uniform rate. This cycle continues throughout the year. Ordering cost is Rs. 100 per order and inventory carrying cost is Rs. 10 per item per month. Annual cost (Rs.) of the plan, neglecting the material cost is

A 1200

B 2400

C 4800

D 6800

Ans: C

45: In PERT analysis, a critical activity has

A Maximum float

B Zero float

C Maximum cost

D Minimum cost

Ans: B

46: A project has six activities (A to F) with respective activity durations 7,5,6,6,8,4 days. The network has three paths A-B, C-D, and E-F. All the activities can be crashed with the same crash cost per day. The number of activities that need to be crushed to reduce the project duration by one day is

A 1

B 2

C 3

D 6

Ans: C

47: A heat pump is used to heat a house in winter and then reversed to cool in the summer. The inside temperature of the house is to be maintained at 20 degree C. The heat transfer through the house walls is 7.9 kJ/s and the outside temperature in winter is 5 degree C. Calculate the approximate minimum power required to drive the heat pump.

A 101.11 W

B 202.22 W

C 303.33 W

D 404.44 W

Ans: D

48: If a closed system is undergoing an irreversible process, the entropy of the system

A Must increase

B Always remains constant

C Must decrease

D May increase or decrease

Ans: D

49: Heat and work are

A Intensive properties

B Extensive properties

C Point functions

D Path functions

Ans: D

50: A single acting two-stage compressor with complete inter cooling delivers air at 16 bar. Assuming an intake stage of 1 bar at 15 degree

C, the pressure ratio per stage is

A 16

B 8

C 4

D 2

Ans: C

51: In a gas turbine cycle, the turbine output is 600 kJ/kg, the compressor work is 400 kJ/kg and the heat supplied is 1000 kJ/kg. The

thermal efficiency of cycle is

A 80%

B 60%

C 40%

D 20%

Ans: D

52: A gas turbine works on which one of the following cycles?

A Brayton

B Rankine

C Stirling

D Otto

Ans: A

53: A circular annular plate having outer and inner diameter of 2.5 m and 1.25 m respectively, is immersed in water with its plane making an angle of 45 degree with the horizontal. The center of circular annular plate is 2.0 m below the free surface. What is the hydrostatic thrust on one side of the plate?

A 72.2 kN

B 36.1 kN

C 18.1 kN

D 144.4 kN

Ans: A

54: A pitot tube is used to measure the velocity of air having density 1.2 kg/m3 .At a point, the difference in the stagnation and static

pressures of a pitot(static) tube is found to be 450 Pa. Determine the velocity of air at the point in m/s.

A 27.38 m/s

B 18.69 m/s

C 9.34 m/s

D 54.76 m/s

Ans: A

55: For the stability of a floating body, under the influence of gravity alone, which of the following is true?

A Metacentre should be below center of gravity

B Metacentre should be above center of gravity

C Metacentre and center of gravity must lie on same horizontal line.

D Metacentre and center of gravity must lie on the same vertical line.

Ans: B

56: A U-tube open on both ends and made of 8 mm diameter glass tube has mercury up to a height of 10 cm in both the limbs. If 19 cm3 of water is added to one of the limbs, what is the approximate difference in mercury level in the two limbs at equilibrium?

A 4.5 mm

B 1.0 mm

C 2.8 mm

D 3.2 mm

Ans: C

57: An aeroplane is cruising at a speed of 750 kmph at an altitude, where the air temperature is 5oC. Calculate the flight Mach

number at this speed.

A 0.31

B 0.62

C 0.93

D None of these

Ans: B

58: An impulse turbine has nozzle efficiency 0.85, blade velocity ratio 0.6 and mean blade velocity 225 m/s. calculate the isentropic

heat (in kJ/kg) drop in the nozzle.

A 41.36 kJ/kg

B 82.72 kJ/kg

C 20.68 kJ/Kg

D 62.04 kJ/kg

Ans: B

59: In order to have maximum power from a Pelton turbine, the bucket speed must be

A Equal to the jet speed

B Equal to half of jet speed

C Equal to twice of jet speed

D Equal to three time of jet speed

Ans: B

60: A moist air is maintained at 1 bar such that its dry bulb temperature is 20 deg C and dew point temperature is 5 deg C.The values of

saturation pressure of steam at 20 deg C & 5 deg C are 0.02339 bar and 0.00872 bar, respectively. Calculate the relative humidity of the

moist air.

A 37.28%

B 36.7%

C 18.2%

D None of these

Ans: A

61: A furnace is made of a red brick wall of thickness 250cm and conductivity 1.2 W/mK. Determine the thickness of a layer of diatomic earth of conductivity 0.15 W/mK that can be used to replace the brick wall for the same heat loss and temperature drop.

A 3.12 cm

B 6.24 cm

C 9.36 cm

D 12.48 cm

Ans: A

62: A wire of 18mm diameter is exposed to air where convective heat transfer coefficient is h = 25 W/m2K. The wire is to be laid with an insulating layer of thermal conductivity 0.6 W/mK. Determine the thickness of the insulation for the maximum heat dissipation

A 5 mm

B 10 mm

C 15 mm

D 20 mm

Ans: C

63: Determine the heat transfer coefficient from a 120 mm diameter steel pipe placed horizontally in ambient at 25 deg C. Nusselt number is 30 and thermal conductivity of air is 0.05 W/mK.

A 12.5 W/m2K

B 5.0 W/m2K

C 15.2 W/m2K

D 20.0 W/m2K

Ans: A

64: A fin has 5 mm diameter and 100 mm length. The thermal conductivity of fin material is 400 W/mK. One end of the fin is maintained at 130 deg C and its remaining surface is exposed to ambient air at 30 deg C. If the convective heat transfer coefficient is 40 W/m2K, the heat loss (W) from the fin is:

A 0.08

B 5.02

C 7.02

D 7.82

Ans: C

65: In an condenser of a power plant, the steam condenses at a temp of 60 deg C. The cooling water enters at 30 deg C and leaves at 45 deg C. LMTD of the condenser is

A 16.2 deg C

B 21.6 deg C

C 30 deg C

D 37.5 deg C

Ans: B

66: A moist air sample has dry bulb temperature of 30 deg C and specific humidity of 11.5 g water vapour per kg dry air.Assume molecular weight of air as 28.93. If the saturation vapour pressure of water at 30 deg C is 4.24 kPa and total pressure is 90kPa, then the relative humidity (%) of air sample is

A 50.5

B 38.5

C 56.5

D 68.5

Ans: B

67: If a mass of moist air in airtight vessel is heated to a higher temperature, then

A Specific humidity of air increases

B Specific humidity of air decreases

C Relative humidity of air increases

D Relative humidity of air decreases

Ans: D

68. A shaft rotating at N=420 rpm is supported by a thrust bearing having external and internal diameter do = 400 mm & di = 240 mm, respectively. Axial load on the bearing is W=150 kN while the intensity of pressure is limited to p=325 kN/m2 . Determine the power lost in overcoming the friction if the coefficient of friction is µ= 0.05 .

A 53.87 kW

B 35.78 kW

C 200.12 kW

D 135.41 kW

Ans: A

69: In a simple truss, the total number of members is : (n = total number of joints)

A m = 2n-2

B m = 2n

C m = 2n-3

D m = 2n+3

Ans: C

70: According to principle of virtual work, the work done on a rigid body or a system of rigid bodies for any virtual displacements compatible with the constraints of the system in equilibrium is

A Zero

B Maximum

C Minimum

D None of these

Ans: A

71: For fixed support , total number of unknowns are :

A Zero

B One

C Two

D Three

Ans: D

72: A solid shaft of diameter 150 mm, length 1200 mm can be subjected to maximum shear stress 80 MPa. A hole of 75 mm diameter is now drilled throughout the length of the shaft. The percentage reduction in torque-carrying capacity of the shaft for the same maximum shear stress is :

A 6.25%

B 16.25%

C 26.25%

D 36.25%

Ans: A

73 : A compression spring is made of music wire of 2 mm diameter having a shear strength and share modulus of 800 MPa and 80 GPa respectively . The mean coil diameter is 20 mm, free length 40 mm , and the number of active coils is 10. If the mean coil diameter is reduced to 10 mm the stiffness of spring is approximately

A decreased by 8 times

B decreased by 2 times

C increased by 2 times

D increased by 8 times

Ans: D

74 : A thin walled spherical shell is subjected to an internal pressure. If the radius of shell is increased by 1% and thickness is reduced by 1 % with the internal pressure remaining the same, the % change in circumferential (hoop) stress is

A 0

B 1.01

C 1.08

D 2.02

Ans: D

75 : A solid shaft can resist a bending moment of 3 kNm and a twisting moment of 4 kNm together , then the maximum torque that can be applied is :

A 7.0 kNm

B 3.5 kNm

C 4.5 kNm

D 5.0 kNm

Ans: D

76: A column has a rectangular cross-section of 10 mm x 20 mm, and length of 1 m . The slenderness ratio of the column is close to:

A 173

B 346

C 519

D 692

Ans: B

77: A belt drive is to be designed for transmission of 10.5 kW power from a pulley 800mm in diameter running at 360 rpm . The angle embraced is 165 deg and coefficient of friction between belt & pulley is 0.3. Safe working stress for leather belt is 2.5 MPa and its density is 1000 kg/m3 . Thickness of belt is 12 mm . Determine the width of belt taking into account the effect of centrifugal tension in the belt.

A 60 mm

B 131 mm

C 262 mm

D 393 mm

Ans: B

78: 20° full depth involute profiled 19-tooth pinion and 37-tooth gear are in mesh. If the module is 5 mm, the centre distance between the gear pair will be :

A 280 mm

B 140 mm

C 150 mm

D 300 mm

Ans: B

79: A disc clutch is required to transmit 5 kW at 2000 rpm. The disc has a friction lining with coefficient of friction equal to 0.25. Bore radius of friction lining is 25mm. Assuming uniform contact pressure of 1 MPa , find the value of outside radius of friction lining.

A 39.41 mm

B 19.71 mm

C 78.82 mm

D 59.12 mm

Ans: A

80: Tooth interference in an external involute spur gear pair can be reduced by

A decreasing centre distance between gear pair

B decreasing the module

C decreasing the pressure angle

D increasing the number of gear teeth

Ans: D

81: Circular disc of uniform thickness 20 mm, radius 200 mm and mass 20 kg is used as fly wheel. If it rotates at 600 rpm the Kinetic

energy of fly wheel (in Joules) is approximately:

A 395

B 790

C 1580

D 3950

Ans: B

82: Balancing of a rigid rotor can be achieved by appropriately balancing masses in

A A single plane

B Two planes

C Three planes

D Four planes

Ans: B

83: Velocity ratio between pinion and gear in a gear drive is 2.3, module of teeth is 2.0 mm and sum of number of teeth on pinion and

gear is 99. What is the centre distance between pinion & gear ?

A 49.5 mm

B 99 mm

C 148.5 mm

D 198 mm

Ans: B

84: In a flat belt drive, if the slip between driver and belt is 1%, and between belt and follower is 3%. The driver & follower pulley diameters are equal, the velocity ratio of the drive will be

A 0.99

B 0.98

C 0.97

D 0.96

Ans: D

85: In the multiple disc clutch, if there are 6 discs on the driving shaft and 5 discs on the driven shaft, then number of pairs of contact

surfaces will be equal to

A 11

B 12

C 10

D 22

Ans: C

86: The life of a ball bearing at a load of 15 kN is 10,000 hours. Determine the life (in hours), if the load is increased to 20 kN for the

same operating condition.

A 10,000 hours

B 8,000 hours

C 4,218 hours

D 2,109 hours

Ans: C

87: A 26-teeth, 5 mm module, 20o full depth pinion receives 5.1 kW at 750 rpm. Determine the tangential force on the gear.

A 1kN

B 2kN

C 3kN

D 4kN

Ans: A

88: Two mating spur gears have 40 and 120 teeth (pinion) respectively. The pinion rotates at 1200 rpm and transmits a torque of 20

Nm. The torque transmitted by the gear is

A 6.6 Nm

20 NmB C

40 Nm

D 60 Nm

Ans: D

89: A 60 mm long and 6mm thick fillet weld carries a steady load of 15 kN along the weld. The shear strength of the weld material is

200 MPa. The factor of safety is

A 1.13

B 2.26

C 3.39

D 4.52

Ans: C

90: A ball bearing operating at a load F has 8000 hours of life. The life of bearing, in hours, when load is doubled to 2F is

A 8000

B 6000

C 4000

D 1000

Ans: D

91: A band brake having band-width of 80 mm, drum dia. of 250mm, coefficient of friction 0.25 and angle of wrap of 270 deg is required to exert a friction torque of 1000Nm. The maximum tension (kN) developed in the band is approximately :

A 1.88

B 3.56

C 6.12

D 11.56

Ans: D

92: A solid circular shaft needs to be designed to transmit a torque of 50Nm. If the allowable shear stress of the material is 140 MPa,

assuming a factor of safety of 2, the minimum allowable design diameter(mm) is

A 8

B 16

C 24

D 32

Ans: B

93: Eight bolts are to be selected for fixing the cover plate of a cylinder subjected to a maximum load of 980 kN. If the design stress

for the bolt material is 315N/mm2, what is the diameter of each bolt ?(consider the closest option)

A 11 mm

B 22.2 mm

C 33 mm

D 44.4 mm

Ans: B

94: In the assembly design of shaft, pulley and key, the weakest member is

A Pulley

B Key

C Shaft

D None of these

Ans: B

95: In an orthogonal cutting, rake angle of the tool is 25° and friction angle is 27°. Using Merchant's shear angle relationship, calculate the value of shear angle.

A 44°

B 33°

C 22°

D 11°

Ans: A

96: Through holes of 12mm diameter are to be drilled in a steel plate of 25mm thickness. Drill spindle speed in 240 rpm, feed 0.25mm/rev and drill point angle is 120°. Assuming over travel of drill as 3mm, find the approximate time required for machining of the hole.

A 10.45 seconds

B 15.73 seconds

C 31.46 seconds

D 26.18 seconds

Ans: C

97: The rake angle of cutting tool is 10°,shear angle 35° and cutting velocity 25m/min. Calculate the chip velocity along the face(m/min)

A 7.91

B 15.82

C 45.82

D 31.64

Ans: B

98: Orthogonal cutting of mild steel has the given data: cutting speed = 35m/min, depth of cut = 0.25mm, tool rake angle = 10°, chip

thickness = 0.8mm, cutting force = 925N, thrust force = 475 N. Using Merchant analysis, find the friction angle(approximately).

A 10°

B 27°

C 37°

D 48°

Ans: C

99: A batch of 10 cutting tools could produce 500 components while working at 50 rpm with a tool feed of 0.25 mm/rev. and depth

of cut =1mm. A similar batch of 10 tools of the same specifications could produce 122 components while working at 80 rpm with

a feed of 0.25 mm/rev and 1mm depth of cut. How many components can be produced with one cutting tool at 60 rpm? (consider

closest option).

A 29

B 31

C 37

D 42

Ans: A

100: Internal gear cutting operation can be performed by

A Milling

B Shaping with rack cutter

C Shaping with pinion cutter

D Hobbing

Ans: C

A m = 2n-2

B m = 2n

C m = 2n-3

D m = 2n+3

Ans: C

70: According to principle of virtual work, the work done on a rigid body or a system of rigid bodies for any virtual displacements compatible with the constraints of the system in equilibrium is

A Zero

B Maximum

C Minimum

D None of these

Ans: A

71: For fixed support , total number of unknowns are :

A Zero

B One

C Two

D Three

Ans: D

72: A solid shaft of diameter 150 mm, length 1200 mm can be subjected to maximum shear stress 80 MPa. A hole of 75 mm diameter is now drilled throughout the length of the shaft. The percentage reduction in torque-carrying capacity of the shaft for the same maximum shear stress is :

A 6.25%

B 16.25%

C 26.25%

D 36.25%

Ans: A

73 : A compression spring is made of music wire of 2 mm diameter having a shear strength and share modulus of 800 MPa and 80 GPa respectively . The mean coil diameter is 20 mm, free length 40 mm , and the number of active coils is 10. If the mean coil diameter is reduced to 10 mm the stiffness of spring is approximately

A decreased by 8 times

B decreased by 2 times

C increased by 2 times

D increased by 8 times

Ans: D

74 : A thin walled spherical shell is subjected to an internal pressure. If the radius of shell is increased by 1% and thickness is reduced by 1 % with the internal pressure remaining the same, the % change in circumferential (hoop) stress is

A 0

B 1.01

C 1.08

D 2.02

Ans: D

75 : A solid shaft can resist a bending moment of 3 kNm and a twisting moment of 4 kNm together , then the maximum torque that can be applied is :

A 7.0 kNm

B 3.5 kNm

C 4.5 kNm

D 5.0 kNm

Ans: D

76: A column has a rectangular cross-section of 10 mm x 20 mm, and length of 1 m . The slenderness ratio of the column is close to:

A 173

B 346

C 519

D 692

Ans: B

77: A belt drive is to be designed for transmission of 10.5 kW power from a pulley 800mm in diameter running at 360 rpm . The angle embraced is 165 deg and coefficient of friction between belt & pulley is 0.3. Safe working stress for leather belt is 2.5 MPa and its density is 1000 kg/m3 . Thickness of belt is 12 mm . Determine the width of belt taking into account the effect of centrifugal tension in the belt.

A 60 mm

B 131 mm

C 262 mm

D 393 mm

Ans: B

78: 20° full depth involute profiled 19-tooth pinion and 37-tooth gear are in mesh. If the module is 5 mm, the centre distance between the gear pair will be :

A 280 mm

B 140 mm

C 150 mm

D 300 mm

Ans: B

79: A disc clutch is required to transmit 5 kW at 2000 rpm. The disc has a friction lining with coefficient of friction equal to 0.25. Bore radius of friction lining is 25mm. Assuming uniform contact pressure of 1 MPa , find the value of outside radius of friction lining.

A 39.41 mm

B 19.71 mm

C 78.82 mm

D 59.12 mm

Ans: A

80: Tooth interference in an external involute spur gear pair can be reduced by

A decreasing centre distance between gear pair

B decreasing the module

C decreasing the pressure angle

D increasing the number of gear teeth

Ans: D

81: Circular disc of uniform thickness 20 mm, radius 200 mm and mass 20 kg is used as fly wheel. If it rotates at 600 rpm the Kinetic

energy of fly wheel (in Joules) is approximately:

A 395

B 790

C 1580

D 3950

Ans: B

82: Balancing of a rigid rotor can be achieved by appropriately balancing masses in

A A single plane

B Two planes

C Three planes

D Four planes

Ans: B

83: Velocity ratio between pinion and gear in a gear drive is 2.3, module of teeth is 2.0 mm and sum of number of teeth on pinion and

gear is 99. What is the centre distance between pinion & gear ?

A 49.5 mm

B 99 mm

C 148.5 mm

D 198 mm

Ans: B

84: In a flat belt drive, if the slip between driver and belt is 1%, and between belt and follower is 3%. The driver & follower pulley diameters are equal, the velocity ratio of the drive will be

A 0.99

B 0.98

C 0.97

D 0.96

Ans: D

85: In the multiple disc clutch, if there are 6 discs on the driving shaft and 5 discs on the driven shaft, then number of pairs of contact

surfaces will be equal to

A 11

B 12

C 10

D 22

Ans: C

86: The life of a ball bearing at a load of 15 kN is 10,000 hours. Determine the life (in hours), if the load is increased to 20 kN for the

same operating condition.

A 10,000 hours

B 8,000 hours

C 4,218 hours

D 2,109 hours

Ans: C

87: A 26-teeth, 5 mm module, 20o full depth pinion receives 5.1 kW at 750 rpm. Determine the tangential force on the gear.

A 1kN

B 2kN

C 3kN

D 4kN

Ans: A

88: Two mating spur gears have 40 and 120 teeth (pinion) respectively. The pinion rotates at 1200 rpm and transmits a torque of 20

Nm. The torque transmitted by the gear is

A 6.6 Nm

20 NmB C

40 Nm

D 60 Nm

Ans: D

89: A 60 mm long and 6mm thick fillet weld carries a steady load of 15 kN along the weld. The shear strength of the weld material is

200 MPa. The factor of safety is

A 1.13

B 2.26

C 3.39

D 4.52

Ans: C

90: A ball bearing operating at a load F has 8000 hours of life. The life of bearing, in hours, when load is doubled to 2F is

A 8000

B 6000

C 4000

D 1000

Ans: D

91: A band brake having band-width of 80 mm, drum dia. of 250mm, coefficient of friction 0.25 and angle of wrap of 270 deg is required to exert a friction torque of 1000Nm. The maximum tension (kN) developed in the band is approximately :

A 1.88

B 3.56

C 6.12

D 11.56

Ans: D

92: A solid circular shaft needs to be designed to transmit a torque of 50Nm. If the allowable shear stress of the material is 140 MPa,

assuming a factor of safety of 2, the minimum allowable design diameter(mm) is

A 8

B 16

C 24

D 32

Ans: B

93: Eight bolts are to be selected for fixing the cover plate of a cylinder subjected to a maximum load of 980 kN. If the design stress

for the bolt material is 315N/mm2, what is the diameter of each bolt ?(consider the closest option)

A 11 mm

B 22.2 mm

C 33 mm

D 44.4 mm

Ans: B

94: In the assembly design of shaft, pulley and key, the weakest member is

A Pulley

B Key

C Shaft

D None of these

Ans: B

95: In an orthogonal cutting, rake angle of the tool is 25° and friction angle is 27°. Using Merchant's shear angle relationship, calculate the value of shear angle.

A 44°

B 33°

C 22°

D 11°

Ans: A

96: Through holes of 12mm diameter are to be drilled in a steel plate of 25mm thickness. Drill spindle speed in 240 rpm, feed 0.25mm/rev and drill point angle is 120°. Assuming over travel of drill as 3mm, find the approximate time required for machining of the hole.

A 10.45 seconds

B 15.73 seconds

C 31.46 seconds

D 26.18 seconds

Ans: C

97: The rake angle of cutting tool is 10°,shear angle 35° and cutting velocity 25m/min. Calculate the chip velocity along the face(m/min)

A 7.91

B 15.82

C 45.82

D 31.64

Ans: B

98: Orthogonal cutting of mild steel has the given data: cutting speed = 35m/min, depth of cut = 0.25mm, tool rake angle = 10°, chip

thickness = 0.8mm, cutting force = 925N, thrust force = 475 N. Using Merchant analysis, find the friction angle(approximately).

A 10°

B 27°

C 37°

D 48°

Ans: C

99: A batch of 10 cutting tools could produce 500 components while working at 50 rpm with a tool feed of 0.25 mm/rev. and depth

of cut =1mm. A similar batch of 10 tools of the same specifications could produce 122 components while working at 80 rpm with

a feed of 0.25 mm/rev and 1mm depth of cut. How many components can be produced with one cutting tool at 60 rpm? (consider

closest option).

A 29

B 31

C 37

D 42

Ans: A

100: Internal gear cutting operation can be performed by

A Milling

B Shaping with rack cutter

C Shaping with pinion cutter

D Hobbing

Ans: C