MECHANICAL ENGINEERING- PAGE 1
Mechanical Engineering MCQs- Page 1
1:-Indicated results are most accurate when the pointer in the analogue read out system lies
A:-around the mid-third of the scale
B:-in the first quarter of the scale
C:-in the second quarter of the scale
D:-around the full capacity of the scale
Ans: A
2:-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 the cycle is
A:-60%
B:-40%
C:-20%
D:-80%
Ans: C
3:-Collapsible toothpaste tubes are manufactured by
A:-Cupping
B:-Extrusion
C:-Cold rolling
D:-Deep drawing
Ans: B
4:-A large clearance volume in a reciprocating compressor results in
A:-lower suction pressure
B:-increased volume flow rate
C:-reduced volume flow rate
D:-lower delivery pressure
Ans: D
5:-The speed variation of the engine caused by the fluctuations of engine turning moment is controlled by
A:-Flywheel
B:-Throttle valve
C:-Governor
D:-D-slide valve
Ans: A
6:-If the tearing efficiency of a riveted joint is 60%, then the ratio of pitch of diameter of rivet is
A:-0.20
B:-0.33
C:-0.40
D:-0.50
Ans: C
7:-A bench vice has the following type of thread
A:-metric thread
B:-acme thread
C:-buttress thread
D:-square thread
Ans: B
8:-All the thread characteristics can be measured precisely with
A:-Thread gauge
B:-Screw pitch gauge
C:-Micrometer with anvil
D:-Tool room microscope
Ans: D
9:-A body cooling from 80°C to 70°C takes 10 minutes when left exposed to environmental conditions. If the body is to cool further from 70°C to 60°C under the same external conditions, it will take
A:-more than 10 minutes
B:-same time of 10 minutes
C:-less than 10 minutes
D:-none of these
Ans: A
10:-Which of the following is considered as comfort condition in air-conditioning?
A:-15°C DBT and 40% RH
B:-20°C DBT and 60% RH
C:-25°C DBT and 70% RH
D:-None of these
Ans: D
11:-Mechanical strain gauges can measure
A:-static and dynamic strains
B:-dynamic strains only
C:-static strains only
D:-static and quasi-static strains
Ans: D
12:-Efficiency of chimney draught is of the order of
A:-less than 1%
B:-2-3%
C:-5-6%
D:-8-10%
Ans: A
13:-A step cone pulley is provided on a lathe to
A:-reverse the direction of spindle rotation
B:-change the spindle speed
C:-drive the lead screw
D:-give desired direction of movement of lathe carriage
Ans: B
14:-Loam sand comprises of
A:-40% of clay and 10% moisture
B:-50% of clay and 10% moisture
C:-80% of clay and 20% moisture
D:-50% of clay and 18% moisture
Ans: A
15:-In tool signature, nose radius is indicated
A:-in the middle
B:-in the beginning
C:-not indicated
D:-at the end
Ans: D
16:-The primary tool force used in calculating the total power consumption in machining is
A:-radial force
B:-frictional force
C:-tangential force
D:-axial force
Ans: C
17:-The brazing process is carried out in the temperature range
A:-60-150°C
B:-350-500°C
C:-180-250°C
D:-600-750°C
Ans: B
18:-Steel balls are manufactured by
A:-casting
B:-sintering
C:-cold heading
D:-machining
Ans: C
19:-Process of austempering results in the formation of
A:-Bainite structure
B:-Martensitic structure
C:-Carburized structure
D:-None of these
Ans: A
20:-Which of the following has no unit?
A:-Surface tension
B:-Kinematic viscosity
C:-Strain
D:-Bulk modulus
Ans: C
A:-around the mid-third of the scale
B:-in the first quarter of the scale
C:-in the second quarter of the scale
D:-around the full capacity of the scale
Ans: A
2:-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 the cycle is
A:-60%
B:-40%
C:-20%
D:-80%
Ans: C
3:-Collapsible toothpaste tubes are manufactured by
A:-Cupping
B:-Extrusion
C:-Cold rolling
D:-Deep drawing
Ans: B
4:-A large clearance volume in a reciprocating compressor results in
A:-lower suction pressure
B:-increased volume flow rate
C:-reduced volume flow rate
D:-lower delivery pressure
Ans: D
5:-The speed variation of the engine caused by the fluctuations of engine turning moment is controlled by
A:-Flywheel
B:-Throttle valve
C:-Governor
D:-D-slide valve
Ans: A
6:-If the tearing efficiency of a riveted joint is 60%, then the ratio of pitch of diameter of rivet is
A:-0.20
B:-0.33
C:-0.40
D:-0.50
Ans: C
7:-A bench vice has the following type of thread
A:-metric thread
B:-acme thread
C:-buttress thread
D:-square thread
Ans: B
8:-All the thread characteristics can be measured precisely with
A:-Thread gauge
B:-Screw pitch gauge
C:-Micrometer with anvil
D:-Tool room microscope
Ans: D
9:-A body cooling from 80°C to 70°C takes 10 minutes when left exposed to environmental conditions. If the body is to cool further from 70°C to 60°C under the same external conditions, it will take
A:-more than 10 minutes
B:-same time of 10 minutes
C:-less than 10 minutes
D:-none of these
Ans: A
10:-Which of the following is considered as comfort condition in air-conditioning?
A:-15°C DBT and 40% RH
B:-20°C DBT and 60% RH
C:-25°C DBT and 70% RH
D:-None of these
Ans: D
11:-Mechanical strain gauges can measure
A:-static and dynamic strains
B:-dynamic strains only
C:-static strains only
D:-static and quasi-static strains
Ans: D
12:-Efficiency of chimney draught is of the order of
A:-less than 1%
B:-2-3%
C:-5-6%
D:-8-10%
Ans: A
13:-A step cone pulley is provided on a lathe to
A:-reverse the direction of spindle rotation
B:-change the spindle speed
C:-drive the lead screw
D:-give desired direction of movement of lathe carriage
Ans: B
14:-Loam sand comprises of
A:-40% of clay and 10% moisture
B:-50% of clay and 10% moisture
C:-80% of clay and 20% moisture
D:-50% of clay and 18% moisture
Ans: A
15:-In tool signature, nose radius is indicated
A:-in the middle
B:-in the beginning
C:-not indicated
D:-at the end
Ans: D
16:-The primary tool force used in calculating the total power consumption in machining is
A:-radial force
B:-frictional force
C:-tangential force
D:-axial force
Ans: C
17:-The brazing process is carried out in the temperature range
A:-60-150°C
B:-350-500°C
C:-180-250°C
D:-600-750°C
Ans: B
18:-Steel balls are manufactured by
A:-casting
B:-sintering
C:-cold heading
D:-machining
Ans: C
19:-Process of austempering results in the formation of
A:-Bainite structure
B:-Martensitic structure
C:-Carburized structure
D:-None of these
Ans: A
20:-Which of the following has no unit?
A:-Surface tension
B:-Kinematic viscosity
C:-Strain
D:-Bulk modulus
Ans: C
21:-Gas turbine works on
A:-Brayton cycle
B:-Rankine cycle
C:-Carnot cycle
D:-None of these
Ans: A
22:-The melting point of mild steel is about
A:-1250°C
B:-1500°C
C:-850°C
D:-1750°C
Ans: B
23:-The angle between the flanks of British Standard Whitworth (BSW) thread is
A:-1250°C
B:-47.5°C
C:-55°C
D:-60°C
Ans: C
24:-Thermal efficiency of a simple gas turbine for a given turbine inlet temperature
A:-increases
B:-decreases
C:-first increases and then decreases
D:-remains the same
Ans: D
25:-Which of the following parameters remains constant during adiabatic saturation process on unsaturated air?
A:-Dew point temperature
B:-Dry bulb temperature
C:-Wet bulb temperature
D:-Relative humidity
Ans: C
26:-Queuing theory deals with problems of
A:-effective use of machines
B:-reducing the waiting time
C:-material handling
D:-none of these
Ans: B
27:-Job evaluation is the method of determining the
A:-Contribution of a job
B:-Contribution of a worker
C:-Relative worth of jobs
D:-Skills required by a worker
Ans: C
28:-Knocking tendency in an SI engine reduces with increasing
A:-Supercharging
B:-Wall temperature
C:-Compression ratio
D:-Engine speed
Ans: D
29:-Which is not a part of magneto-ignition system?
A:-Condenser
B:-Battery
C:-Circuit breaker
D:-Induction coil
Ans: B
30:-Superheating in a refrigeration cycle
A:-Decreases COP
B:-Increases COP
C:-COP remains unchanged
D:-Unpredictable
Ans: D
31:-Change of resistance with intensity of light takes place in
A:-Photo-voltaic cell
B:-Photo-emissive cell
C:-Photo-conductive cell
D:-None of these
Ans: C
32:-The diameter of a round bar with close tolerance is quickly measured by
A:-External micro meter
B:-Slip gauge
C:-Vernier caliper
D:-Snap gauge
Ans: D
33:-In Electrolux refrigerator
A:-Ammonia evaporates in hydrogen
B:-Hydrogen evaporates in ammonia
C:-Hydrogen is absorbed in ammonia
D:-Hydrogen is absorbed in water
Ans: A
34:-Free convection heat flow depends on all of the following except
A:-Coefficient of viscosity
B:-Velocity
C:-Density
D:-Gravitational force
Ans: B
35:-Major constituents of satellite are
A:-Nickel, copper and zinc
B:-Zinc, lead and tin
C:-Cobalt, vanadium and nickel
D:-Cobalt, chromium and tungsten
Ans: D
36:-Typewriter constitutes
A:-Structure
B:-Machine
C:-Inversion
D:-Mechanism
Ans: D
37:-The equation PV=mRT is essentially valid for
A:-Perfect gas
B:-Real gas
C:-Monoatomic gas
D:-Mixture of gases
Ans: A
38:-Cavitation in centrifugal pumps can be reduced by
A:-Throttling the discharge
B:-Increasing the flow velocity
C:-Reducing the discharge
D:-Reducing the suction head
Ans: D
39:-In low carbon steels, the presence of small quantities of sulphur improves
A:-Formability
B:-Machinability
C:-Weldability
D:-Hardenability
Ans: B
40:-Moment of inertia of a body does not depend on
A:-Axis of rotation of the body
B:-Mass of the body
C:-Angular velocity of the body
D:-Distribution of mass in the body
Ans: C
41:-Which of the following does not pertain to inventory management?
A:-Production schedule
B:-State of merchandise
C:-Control of stock
D:-Effective running of stores
Ans: A
42:-In value engineering, the term value refers to
A:-relation between productivity and cost
B:-market value
C:-relation between cost and efficiency
D:-relation between function and cost
Ans: D
43:-The throttling operation in a refrigeration cycle is carried out in
A:-evaporator
B:-capillary tube
C:-discharge valve
D:-expansion valve
Ans: B
44:-The amount of moisture in air can be measured by
A:-Sling psychrometer
B:-Mass spectrometer
C:-Photometer
D:-Thermistor
Ans: A
45:-Which of the following is not a correct statement?
A:-The balls in a ball bearing remain in position due to centrifugal force
B:-Cage is made hardest of all parts in ball bearings
C:-Spherical roller bearings have the capacity for self-alignment
D:-Roller bearings have higher load capacity than that of ball bearings for a given overall size
Ans: A
46:-Which of the following thermocouples can measure temperature in a comparatively higher range?
A:-Chromel-alumel
B:-Iron-constantan
C:-Iridium-rhodium
D:-Platinum-rhodium
Ans: C
47:-Gears produced by die casting are generally used for
A:-high torque transmission
B:-light duty
C:-low temperature application
D:-high axial thrust transmission
Ans: B
48:-The difference between the maximum material limits of mating parts is known as
A:-Deviation
B:-Clearance
C:-Allowance
D:-Tolerance
Ans: C
49:-Trimming is the process associated with
A:-Forging
B:-Press work
C:-Polishing of metals
D:-Electroplating
Ans: B
50:-A dead weight tester is used for
A:-accurate measurement of load
B:-producing high pressure
C:-testing the magnitude of given weight
D:-calibrating pressure measuring instruments
Ans: D
51:-With the percentage increase of carbon in steel
A:-Brittleness of steel decreases
B:-Strength of steel decreases
C:-Ductility of steel decreases
D:-Hardness of steel decreases
Ans: C
52:-The refrigerant used in commercial ice plant is
A:-Air
B:-Carbon dioxide
C:-Ammonia
D:-Freon-12
Ans: C
53:-The process of discovering and identifying the pertinent information relative to the nature of a specific job is known as
A:-Job analysis
B:-Job description
C:-Job classification
D:-Job identification
Ans: A
54:-Plug rolling is used to
A:-produce seamless tube
B:-reduce wall thickness and increase diameter of tubes
C:-produce collapsible tubes
D:-increase wall thickness of tubes
Ans: B
55:-A circular shaft can transmit a torque of 5 kNm. If the torque is reduced to 4 kNm, then the maximum value of bending moment that can be applied to the shaft is
A:-1 kNm
B:-2 kNm
C:-3 kNm
D:-4 kNm
Ans: C
56:-Which of the following is not a scalar quantity?
A:-Mass
B:-Volume
C:-Time
D:-Acceleration
Ans: D
57:-Kinematic viscosity is equal to
A:-Density/dynamic viscosity
B:-Dynamic viscosity/density
C:-Dynamic viscosity × density
D:-None of these
Ans: B
58:-A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of `"1.5 MN/m^2"` . Then the hoop stress will be
A:-`"50 MN/m^2"`
B:-`"30 MN/m^2"
C:-`"100 MN/m^2"
D:-`"200 MN/m^2"
Ans: C
59:-The cutting tool in a milling machine is mounted on
A:-Tool holder
B:-Arbor
C:-Column
D:-Spindle
Ans: B
60:-Fusible plug is fitted in a boiler to
A:-extinguish fire in case of low water level
B:-prevent leakage of steam from boiler
C:-allow passage of only super heated steam from the boiler
D:-keep the boiler pressure within the prescribed limits
Ans: A
61:-Which of the following is an amorphous material?
A:-Lead
B:-Rubber
C:-Mica
D:-Glass
Ans: D
62:-Which of the following is used for bearing liner?
A:-Bronze
B:-Babbit metal
C:-Gun metal
D:-Brass
Ans: B
63:-The weight of oxygen in atmospheric air is
A:-21%
B:-19%
C:-23%
D:-31%
Ans: C
64:-A Pelton wheel turbine is ideally suited for
A:-High head and low discharge
B:-High head and high discharge
C:-Low head and low discharge
D:-Medium head and medium discharge
Ans: A
65:-Which of the following is not the part of a shaper?
A:-Ram
B:-Table
C:-Cross slide
D:-Clapper box
Ans: C
66:-Which of the following materials require the largest size of riser for the same size of casting?
A:-Cast iron
B:-Aluminium
C:-Steel
D:-Copper
Ans: B
67:-On a psychrometric chart, the relative humidity lines are represented by
A:-uniformly spaced inclined lines
B:-uniformly spaced horizontal lines
C:-non-uniformly spaced inclined lines
D:-curved lines
Ans: D
68:-The mathematical technique for finding the best use of limited resources in an optimum manner is known as
A:-Queuing theory
B:-Linear programming
C:-Operation research
D:-Network analysis
Ans: B
69:-Rate of change of momentum takes place in the direction
A:-of applied force
B:-of motion
C:-opposite to the direction of applied force
D:-perpendicular to the direction of motion
Ans: A
70:-Lean air-fuel mixture is required for
A:-acceleration
B:-idling
C:-starting
D:-cruising
Ans: D
71:-A 100 cc engine has the following parameter as 100 cc
A:-cylinder volume
B:-clearance volume
C:-swept volume
D:-full tank capacity
Ans: C
72:-Which of the following has maximum malleability?
A:-Lead
B:-Brass
C:-Wrought iron
D:-Aluminium
Ans: A
73:-The ratio of actual damping coefficient to the critical damping coefficient is called as
A:-Magnification factor
B:-Damping factor
C:-Critical damping ratio
D:-Logarithmic decrement
Ans: B
74:-Dehumidification is the process of removing moisture from air with dry bulb temperature
A:-decreasing
B:-increasing
C:-changing in any direction
D:-Remaining constant
Ans: D
75:-Centrifugal pump is started with its delivery valve
A:-Kept fully closed
B:-Kept fully open
C:-Kept 50% open
D:-None of these
Ans: A
76:-Bending operation should be performed
A:-At 30° to the grain direction
B:-Parallel to the grain direction
C:-There is no such criteria
D:-At right angle to the grain direction
Ans: D
77:-De Lavel turbine is a
A:-simple impulse turbine
B:-multistage turbine
C:-simple reaction turbine
D:-velocity compounded impulse turbine
Ans: A
78:-The refrigerant R-744 is
A:-ammonia
B:-freon-12
C:-carbon dioxide
D:-sulphur dioxide
Ans: C
79:-The most flexible criteria for analysing an economic investmet is
A:-rate of return criteria
B:-salvage value
C:-present value method
D:-future value method
Ans: B
80:-Which of the following represents a group incentive plan?
A:-Rowan plan
B:-Bedaux plan
C:-Halsey premium plan
D:-Scanlon plan
Ans: D
A:-Brayton cycle
B:-Rankine cycle
C:-Carnot cycle
D:-None of these
Ans: A
22:-The melting point of mild steel is about
A:-1250°C
B:-1500°C
C:-850°C
D:-1750°C
Ans: B
23:-The angle between the flanks of British Standard Whitworth (BSW) thread is
A:-1250°C
B:-47.5°C
C:-55°C
D:-60°C
Ans: C
24:-Thermal efficiency of a simple gas turbine for a given turbine inlet temperature
A:-increases
B:-decreases
C:-first increases and then decreases
D:-remains the same
Ans: D
25:-Which of the following parameters remains constant during adiabatic saturation process on unsaturated air?
A:-Dew point temperature
B:-Dry bulb temperature
C:-Wet bulb temperature
D:-Relative humidity
Ans: C
26:-Queuing theory deals with problems of
A:-effective use of machines
B:-reducing the waiting time
C:-material handling
D:-none of these
Ans: B
27:-Job evaluation is the method of determining the
A:-Contribution of a job
B:-Contribution of a worker
C:-Relative worth of jobs
D:-Skills required by a worker
Ans: C
28:-Knocking tendency in an SI engine reduces with increasing
A:-Supercharging
B:-Wall temperature
C:-Compression ratio
D:-Engine speed
Ans: D
29:-Which is not a part of magneto-ignition system?
A:-Condenser
B:-Battery
C:-Circuit breaker
D:-Induction coil
Ans: B
30:-Superheating in a refrigeration cycle
A:-Decreases COP
B:-Increases COP
C:-COP remains unchanged
D:-Unpredictable
Ans: D
31:-Change of resistance with intensity of light takes place in
A:-Photo-voltaic cell
B:-Photo-emissive cell
C:-Photo-conductive cell
D:-None of these
Ans: C
32:-The diameter of a round bar with close tolerance is quickly measured by
A:-External micro meter
B:-Slip gauge
C:-Vernier caliper
D:-Snap gauge
Ans: D
33:-In Electrolux refrigerator
A:-Ammonia evaporates in hydrogen
B:-Hydrogen evaporates in ammonia
C:-Hydrogen is absorbed in ammonia
D:-Hydrogen is absorbed in water
Ans: A
34:-Free convection heat flow depends on all of the following except
A:-Coefficient of viscosity
B:-Velocity
C:-Density
D:-Gravitational force
Ans: B
35:-Major constituents of satellite are
A:-Nickel, copper and zinc
B:-Zinc, lead and tin
C:-Cobalt, vanadium and nickel
D:-Cobalt, chromium and tungsten
Ans: D
36:-Typewriter constitutes
A:-Structure
B:-Machine
C:-Inversion
D:-Mechanism
Ans: D
37:-The equation PV=mRT is essentially valid for
A:-Perfect gas
B:-Real gas
C:-Monoatomic gas
D:-Mixture of gases
Ans: A
38:-Cavitation in centrifugal pumps can be reduced by
A:-Throttling the discharge
B:-Increasing the flow velocity
C:-Reducing the discharge
D:-Reducing the suction head
Ans: D
39:-In low carbon steels, the presence of small quantities of sulphur improves
A:-Formability
B:-Machinability
C:-Weldability
D:-Hardenability
Ans: B
40:-Moment of inertia of a body does not depend on
A:-Axis of rotation of the body
B:-Mass of the body
C:-Angular velocity of the body
D:-Distribution of mass in the body
Ans: C
41:-Which of the following does not pertain to inventory management?
A:-Production schedule
B:-State of merchandise
C:-Control of stock
D:-Effective running of stores
Ans: A
42:-In value engineering, the term value refers to
A:-relation between productivity and cost
B:-market value
C:-relation between cost and efficiency
D:-relation between function and cost
Ans: D
43:-The throttling operation in a refrigeration cycle is carried out in
A:-evaporator
B:-capillary tube
C:-discharge valve
D:-expansion valve
Ans: B
44:-The amount of moisture in air can be measured by
A:-Sling psychrometer
B:-Mass spectrometer
C:-Photometer
D:-Thermistor
Ans: A
45:-Which of the following is not a correct statement?
A:-The balls in a ball bearing remain in position due to centrifugal force
B:-Cage is made hardest of all parts in ball bearings
C:-Spherical roller bearings have the capacity for self-alignment
D:-Roller bearings have higher load capacity than that of ball bearings for a given overall size
Ans: A
46:-Which of the following thermocouples can measure temperature in a comparatively higher range?
A:-Chromel-alumel
B:-Iron-constantan
C:-Iridium-rhodium
D:-Platinum-rhodium
Ans: C
47:-Gears produced by die casting are generally used for
A:-high torque transmission
B:-light duty
C:-low temperature application
D:-high axial thrust transmission
Ans: B
48:-The difference between the maximum material limits of mating parts is known as
A:-Deviation
B:-Clearance
C:-Allowance
D:-Tolerance
Ans: C
49:-Trimming is the process associated with
A:-Forging
B:-Press work
C:-Polishing of metals
D:-Electroplating
Ans: B
50:-A dead weight tester is used for
A:-accurate measurement of load
B:-producing high pressure
C:-testing the magnitude of given weight
D:-calibrating pressure measuring instruments
Ans: D
51:-With the percentage increase of carbon in steel
A:-Brittleness of steel decreases
B:-Strength of steel decreases
C:-Ductility of steel decreases
D:-Hardness of steel decreases
Ans: C
52:-The refrigerant used in commercial ice plant is
A:-Air
B:-Carbon dioxide
C:-Ammonia
D:-Freon-12
Ans: C
53:-The process of discovering and identifying the pertinent information relative to the nature of a specific job is known as
A:-Job analysis
B:-Job description
C:-Job classification
D:-Job identification
Ans: A
54:-Plug rolling is used to
A:-produce seamless tube
B:-reduce wall thickness and increase diameter of tubes
C:-produce collapsible tubes
D:-increase wall thickness of tubes
Ans: B
55:-A circular shaft can transmit a torque of 5 kNm. If the torque is reduced to 4 kNm, then the maximum value of bending moment that can be applied to the shaft is
A:-1 kNm
B:-2 kNm
C:-3 kNm
D:-4 kNm
Ans: C
56:-Which of the following is not a scalar quantity?
A:-Mass
B:-Volume
C:-Time
D:-Acceleration
Ans: D
57:-Kinematic viscosity is equal to
A:-Density/dynamic viscosity
B:-Dynamic viscosity/density
C:-Dynamic viscosity × density
D:-None of these
Ans: B
58:-A boiler shell 200 cm diameter and plate thickness 1.5 cm is subjected to internal pressure of `"1.5 MN/m^2"` . Then the hoop stress will be
A:-`"50 MN/m^2"`
B:-`"30 MN/m^2"
C:-`"100 MN/m^2"
D:-`"200 MN/m^2"
Ans: C
59:-The cutting tool in a milling machine is mounted on
A:-Tool holder
B:-Arbor
C:-Column
D:-Spindle
Ans: B
60:-Fusible plug is fitted in a boiler to
A:-extinguish fire in case of low water level
B:-prevent leakage of steam from boiler
C:-allow passage of only super heated steam from the boiler
D:-keep the boiler pressure within the prescribed limits
Ans: A
61:-Which of the following is an amorphous material?
A:-Lead
B:-Rubber
C:-Mica
D:-Glass
Ans: D
62:-Which of the following is used for bearing liner?
A:-Bronze
B:-Babbit metal
C:-Gun metal
D:-Brass
Ans: B
63:-The weight of oxygen in atmospheric air is
A:-21%
B:-19%
C:-23%
D:-31%
Ans: C
64:-A Pelton wheel turbine is ideally suited for
A:-High head and low discharge
B:-High head and high discharge
C:-Low head and low discharge
D:-Medium head and medium discharge
Ans: A
65:-Which of the following is not the part of a shaper?
A:-Ram
B:-Table
C:-Cross slide
D:-Clapper box
Ans: C
66:-Which of the following materials require the largest size of riser for the same size of casting?
A:-Cast iron
B:-Aluminium
C:-Steel
D:-Copper
Ans: B
67:-On a psychrometric chart, the relative humidity lines are represented by
A:-uniformly spaced inclined lines
B:-uniformly spaced horizontal lines
C:-non-uniformly spaced inclined lines
D:-curved lines
Ans: D
68:-The mathematical technique for finding the best use of limited resources in an optimum manner is known as
A:-Queuing theory
B:-Linear programming
C:-Operation research
D:-Network analysis
Ans: B
69:-Rate of change of momentum takes place in the direction
A:-of applied force
B:-of motion
C:-opposite to the direction of applied force
D:-perpendicular to the direction of motion
Ans: A
70:-Lean air-fuel mixture is required for
A:-acceleration
B:-idling
C:-starting
D:-cruising
Ans: D
71:-A 100 cc engine has the following parameter as 100 cc
A:-cylinder volume
B:-clearance volume
C:-swept volume
D:-full tank capacity
Ans: C
72:-Which of the following has maximum malleability?
A:-Lead
B:-Brass
C:-Wrought iron
D:-Aluminium
Ans: A
73:-The ratio of actual damping coefficient to the critical damping coefficient is called as
A:-Magnification factor
B:-Damping factor
C:-Critical damping ratio
D:-Logarithmic decrement
Ans: B
74:-Dehumidification is the process of removing moisture from air with dry bulb temperature
A:-decreasing
B:-increasing
C:-changing in any direction
D:-Remaining constant
Ans: D
75:-Centrifugal pump is started with its delivery valve
A:-Kept fully closed
B:-Kept fully open
C:-Kept 50% open
D:-None of these
Ans: A
76:-Bending operation should be performed
A:-At 30° to the grain direction
B:-Parallel to the grain direction
C:-There is no such criteria
D:-At right angle to the grain direction
Ans: D
77:-De Lavel turbine is a
A:-simple impulse turbine
B:-multistage turbine
C:-simple reaction turbine
D:-velocity compounded impulse turbine
Ans: A
78:-The refrigerant R-744 is
A:-ammonia
B:-freon-12
C:-carbon dioxide
D:-sulphur dioxide
Ans: C
79:-The most flexible criteria for analysing an economic investmet is
A:-rate of return criteria
B:-salvage value
C:-present value method
D:-future value method
Ans: B
80:-Which of the following represents a group incentive plan?
A:-Rowan plan
B:-Bedaux plan
C:-Halsey premium plan
D:-Scanlon plan
Ans: D
81. In a boiler, feed water supplied per hour is 215 kg, while coal fired per hour is 25 kg. Net enthalpy rise per kg of water is 150 kJ. If the calorific value of coal is 2000 kJ/kg, determine the boiler efficiency.
A 25%
B 50%
C 64.5%
D 100%
Ans: C
82. A spark ignition engine operates at compression ratio 7.5 to produce (24 x 105 x vc)J work per cycle, where vc is clearance volume (in m3). Determine the indicated mean effective pressure in the cylinder.
A 1.23 bar
B 2.46 bar
C 3.69 bar
D 4.92 bar
Ans: C
83: In an Otto cycle, air is compressed adiabatically from 270C and 1 bar to 16 bar. Heat is supplied at constant volume until the pressure rises to 40 bar. For the air, r=1.4, Cv=0.718 kJ/kg K and R = 0.2872 kJ/kg K. The mean effective pressure of the cycle is:
A 2.63 bar
B 5.26 bar
C 7.89 bar
D None of these
Ans: B
84: A single cylinder C.I. engine has 35% brake thermal efficiency and 75% mechanical efficiency. It is supplied with high speed diesel oil of 40 MJ/kg calorific value. The brake specific fuel consumption (BSFC) and Indicated specific fuel consumption (IFSC) respectively is :
A 0.257 kg/h-kW, 0.193 kg/h-kW
B 0.128 kg/h-kW, 0.193 kg/h-kW
C 0.257 kg/h-kW, 0.097 kg/h-kW
D None of these
Ans: A
85: In air-standard Otto cycle, the compression ratio is 10 .The condition at the beginning of the compression is 100 kPa and 27oC . Heat added at constant volume is 1500 kJ/kg , while 700 kJ/kg of heat is rejected during the other constant volume process in the cycle . Specific gas constant for air = 0.287 kJ/kg K. The mean effective pressure (kPa) of the cycle is
A 103.23 kPa
B 1032.3 kPa
C 2064.6 kPa
D none of these
Ans: B
86: A hydraulic turbine develops 1000 kW power for a head of 40 m. If the head is reduced to 20m, the power developed (kW) is
A 177.33
B 353.55
C 505.44
D 707.77
Ans: B
87: In case of a Diesel cycle , increasing the cut-off ratio will increase
A Efficiency
B Mean effective pressure
C Maximum weight
D The engine weight
Ans: B
88: The bore and stroke of the cylinder of a 6-cylinder engine working on an Otto-cycle are 17 cm and 30 cm, respectively .Total clearance volume is 9225 cm3, then what is the compression ratio ?
A 7.8
B 6.2
C 15.8
D 5.4
Ans: D
89: The air-fuel ratio for idling speed of an automobile petrol engine is closer to
A 10:1
B 15:1
C 17:1
D 21:1
Ans: A
90: In the operation of four-stoke Diesel engine , the term 'Squish ' refers to
A injection of fuel in pre-combustion chamber
B discharge of gases from the combustion chamber
C entry of air into the combustion chamber
D Stripping of fuel from the core.
Ans: C
91: A multiple automatic centre performs four operations with times 100, 120, 135 and 155 seconds at each of its work centers. Determine the cycle time (time required to manufacture one work piece) of the work centre.
A 100 sec
B 120 sec
C 135 sec
D 155 sec
Ans: D
92: NC contouring is an example of
A Continuous path positioning
B Point -to - point positioning
C Absolute positioning
D Incremental positioning
Ans: A
93: Which type of motor is not used in spindle drives of CNC machine tools?
A Induction motor
B Stepper motor
C DC servo motor
D Linear servo motor
Ans: A
94: A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2 mm depth by a cutter of 10 mm diameter: between points (0,0) and (100, 100) on the XY plane (dimensions in mm) .The feed rate used for milling is 50 mm /min. Milling time for the slot is
A 121.1 sec
B 170 sec
C 181.7 sec
D 240 sec
Ans: C
95: A CNC program block, N002 G02 G91 X40 Z40 ------ G02 and G91 refer to
A Circular interpolation in counter clock wise direction and incremental dimension
B Circular interpolation in counter clock wise direction and absolute dimension
C Circular interpolation in clock wise direction and incremental dimension
D Circular interpolation in clock wise direction and absolute dimension
Ans: C
96: In a CAD package mirror image of a 2D point P(5,10) is to be obtained about a line which passes through the origin and makes an angle of 45 degree counter clock-wise with X-axis. The coordinates of the transformed point will be
A 7.5,5
B 10,5
C 7.5,-5
D 10,-5
Ans: B
97: Current major commercial CAD/CAM systems include
A Uni graphics
B Pro/E
C IDEAS
D All of these
Ans: D
98: In a CNC machine tool , encoder is used to sense and control
A Table position
B Table velocity
C Spindle speed
D Coolant flow
Ans: A
99: The work table of a positioning system is driven by a lead screw having pitch = 8 mm. Lead screw is connected to the output shaft of a stepper motor through gear box whose ratio is 6 :1.The stepper motor has 48 step angles. Determine the no. of pulses and speed of stepper motor required to move the table a distance of 200 mm from its present position at a linear velocity of 440 mm/min.
A 7920, 330 rpm
B 792, 33.0 rpm
C 79.2, 33.0 rpm
D 79200, 3300 rpm
Ans: A
100: In summer air conditioning, the condition of air passing through the space undergoes a process of
A Sensible cooling
B Sensible heating
C Cooling and dehumidification
D Heating and humidification
Ans: C
A 25%
B 50%
C 64.5%
D 100%
Ans: C
82. A spark ignition engine operates at compression ratio 7.5 to produce (24 x 105 x vc)J work per cycle, where vc is clearance volume (in m3). Determine the indicated mean effective pressure in the cylinder.
A 1.23 bar
B 2.46 bar
C 3.69 bar
D 4.92 bar
Ans: C
83: In an Otto cycle, air is compressed adiabatically from 270C and 1 bar to 16 bar. Heat is supplied at constant volume until the pressure rises to 40 bar. For the air, r=1.4, Cv=0.718 kJ/kg K and R = 0.2872 kJ/kg K. The mean effective pressure of the cycle is:
A 2.63 bar
B 5.26 bar
C 7.89 bar
D None of these
Ans: B
84: A single cylinder C.I. engine has 35% brake thermal efficiency and 75% mechanical efficiency. It is supplied with high speed diesel oil of 40 MJ/kg calorific value. The brake specific fuel consumption (BSFC) and Indicated specific fuel consumption (IFSC) respectively is :
A 0.257 kg/h-kW, 0.193 kg/h-kW
B 0.128 kg/h-kW, 0.193 kg/h-kW
C 0.257 kg/h-kW, 0.097 kg/h-kW
D None of these
Ans: A
85: In air-standard Otto cycle, the compression ratio is 10 .The condition at the beginning of the compression is 100 kPa and 27oC . Heat added at constant volume is 1500 kJ/kg , while 700 kJ/kg of heat is rejected during the other constant volume process in the cycle . Specific gas constant for air = 0.287 kJ/kg K. The mean effective pressure (kPa) of the cycle is
A 103.23 kPa
B 1032.3 kPa
C 2064.6 kPa
D none of these
Ans: B
86: A hydraulic turbine develops 1000 kW power for a head of 40 m. If the head is reduced to 20m, the power developed (kW) is
A 177.33
B 353.55
C 505.44
D 707.77
Ans: B
87: In case of a Diesel cycle , increasing the cut-off ratio will increase
A Efficiency
B Mean effective pressure
C Maximum weight
D The engine weight
Ans: B
88: The bore and stroke of the cylinder of a 6-cylinder engine working on an Otto-cycle are 17 cm and 30 cm, respectively .Total clearance volume is 9225 cm3, then what is the compression ratio ?
A 7.8
B 6.2
C 15.8
D 5.4
Ans: D
89: The air-fuel ratio for idling speed of an automobile petrol engine is closer to
A 10:1
B 15:1
C 17:1
D 21:1
Ans: A
90: In the operation of four-stoke Diesel engine , the term 'Squish ' refers to
A injection of fuel in pre-combustion chamber
B discharge of gases from the combustion chamber
C entry of air into the combustion chamber
D Stripping of fuel from the core.
Ans: C
91: A multiple automatic centre performs four operations with times 100, 120, 135 and 155 seconds at each of its work centers. Determine the cycle time (time required to manufacture one work piece) of the work centre.
A 100 sec
B 120 sec
C 135 sec
D 155 sec
Ans: D
92: NC contouring is an example of
A Continuous path positioning
B Point -to - point positioning
C Absolute positioning
D Incremental positioning
Ans: A
93: Which type of motor is not used in spindle drives of CNC machine tools?
A Induction motor
B Stepper motor
C DC servo motor
D Linear servo motor
Ans: A
94: A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2 mm depth by a cutter of 10 mm diameter: between points (0,0) and (100, 100) on the XY plane (dimensions in mm) .The feed rate used for milling is 50 mm /min. Milling time for the slot is
A 121.1 sec
B 170 sec
C 181.7 sec
D 240 sec
Ans: C
95: A CNC program block, N002 G02 G91 X40 Z40 ------ G02 and G91 refer to
A Circular interpolation in counter clock wise direction and incremental dimension
B Circular interpolation in counter clock wise direction and absolute dimension
C Circular interpolation in clock wise direction and incremental dimension
D Circular interpolation in clock wise direction and absolute dimension
Ans: C
96: In a CAD package mirror image of a 2D point P(5,10) is to be obtained about a line which passes through the origin and makes an angle of 45 degree counter clock-wise with X-axis. The coordinates of the transformed point will be
A 7.5,5
B 10,5
C 7.5,-5
D 10,-5
Ans: B
97: Current major commercial CAD/CAM systems include
A Uni graphics
B Pro/E
C IDEAS
D All of these
Ans: D
98: In a CNC machine tool , encoder is used to sense and control
A Table position
B Table velocity
C Spindle speed
D Coolant flow
Ans: A
99: The work table of a positioning system is driven by a lead screw having pitch = 8 mm. Lead screw is connected to the output shaft of a stepper motor through gear box whose ratio is 6 :1.The stepper motor has 48 step angles. Determine the no. of pulses and speed of stepper motor required to move the table a distance of 200 mm from its present position at a linear velocity of 440 mm/min.
A 7920, 330 rpm
B 792, 33.0 rpm
C 79.2, 33.0 rpm
D 79200, 3300 rpm
Ans: A
100: In summer air conditioning, the condition of air passing through the space undergoes a process of
A Sensible cooling
B Sensible heating
C Cooling and dehumidification
D Heating and humidification
Ans: C
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