MECHANICAL ENGINEERING- PAGE 9
Mechanical Engineering MCQs- Page 9
1. V-blocks are available in grades of
(A) 0 and 1 (B) 1 and 2 (C) A1 and A2 (D) A and B
Ans: D
2. Where is pin hook spanner used ?
(A) Circular nut having slot (B) Hexagonal nut (C) Square nut (D) None of the above
Ans: A
3. The best way of avoiding accident is by
(A) Doing work in ancient way (B) Observing safety rules related to job, machine and work piece
(C) Doing work in one’s own way (D) Using safety equipment
Ans: B
4. A 6H7 holes is to be reamed in a steel work piece. What size of drill will be required ?
(A) 5.5 mm (B) 5.8 mm (C) 6.0 mm (D) 6.2 mm
Ans: B
5. Gun metal is an alloy of
(A) copper, tin and zinc (B) copper, lead and zinc
(C) iron, zinc and nickel (D) aluminum, lead and nickel
Ans: A
6. An oily floor should be cleaned by
(A) Cotton waste (B) Putting water (C) Putting saw dust (D) Spraying carbon dioxide or sand
Ans: C
7. The point angle of twist drill depends upon the
(A) cutting speed (B) type of drilling machine (C) size of drill (D) material to be drilled
Ans: D
8. Carbon content in cold chisel is
(A) 0.6 to 0.7% (B) 1.2 to 1.4% (C) 0.3 to 0.5% (D) 0.9 to 1.1%
Ans: D
9.If D is the initial diameter d is the finished diameter in lathe work, then the depth of cut is
(A) (D – d)/2 (B) (D + d)/2
(C) (d – D)/2 (D) None of these
Ans: A
(A) 0 and 1 (B) 1 and 2 (C) A1 and A2 (D) A and B
Ans: D
2. Where is pin hook spanner used ?
(A) Circular nut having slot (B) Hexagonal nut (C) Square nut (D) None of the above
Ans: A
3. The best way of avoiding accident is by
(A) Doing work in ancient way (B) Observing safety rules related to job, machine and work piece
(C) Doing work in one’s own way (D) Using safety equipment
Ans: B
4. A 6H7 holes is to be reamed in a steel work piece. What size of drill will be required ?
(A) 5.5 mm (B) 5.8 mm (C) 6.0 mm (D) 6.2 mm
Ans: B
5. Gun metal is an alloy of
(A) copper, tin and zinc (B) copper, lead and zinc
(C) iron, zinc and nickel (D) aluminum, lead and nickel
Ans: A
6. An oily floor should be cleaned by
(A) Cotton waste (B) Putting water (C) Putting saw dust (D) Spraying carbon dioxide or sand
Ans: C
7. The point angle of twist drill depends upon the
(A) cutting speed (B) type of drilling machine (C) size of drill (D) material to be drilled
Ans: D
8. Carbon content in cold chisel is
(A) 0.6 to 0.7% (B) 1.2 to 1.4% (C) 0.3 to 0.5% (D) 0.9 to 1.1%
Ans: D
9.If D is the initial diameter d is the finished diameter in lathe work, then the depth of cut is
(A) (D – d)/2 (B) (D + d)/2
(C) (d – D)/2 (D) None of these
Ans: A
10. The algebraic sum of moments of two unlike parallel forces about any point in their plane will be
1) Zero
2) Constant
3) Always anticlockwise
4) Always clockwise
Ans: 2
11. If the number of members (m) in a frame having joints (j) is more than that required by the equation m=2j-3, then such frames called
1) Ideal frame
2) Imperfect frame
3) Perfect frame
4) Redundant frame
Ans: 4
12. Hoop stress for a wooden wheel with steel flat tyre in terms of outside diameter of the wheel D, inside diameter of the tyre d and Young’s modulus E is
1) E(D-d)/d
2) E(D/d)
3) E(D/(D-d))
4) E(d/D)
Ans: 1
13. Relation between the elastic constants E and C for poisson’s ratio of 0.25 is
1) E=10C
2) E=5C
3) E=2.5C
4) E=0.25C
Ans: 3
14. The radius of Mohr’s circle represents
1) Minimum normal stress
2) Maximum normal stress
3) Minimum shear stress
4) Maximum shear stress
Ans: 4
15. For an inclined plane in a rectangular block subjected to two mutually perpendicular normal stresses 1000 MPa and 400 MPa and shear stresses 400 MPa, the maximum normal stress will be
1) 1200 MPa
2) 700 MPa
3) 600 MPa
4) 200 MPa
Ans: 1
16. At a hinge in a beam
1) Shear force is zero
2) Bending moment is maximum
3) Bending moment is zero
4) Bending moment changes sign
Ans: 3
17. The bending moment for a beam with equal overhangs and carrying equal point loads each of P at the free ends, the shear force for the beam portion between the supports is
1) Zero
2) equal to P
3) Linearly varying from –P to +P
4) Linearly varying from 0 to P
Ans: 1
18. Assumption made in the theory of bending is
1) Radius of curvature is small
2) Radius of curvature is large
3) Transverse sections of the beam do not remain plane after
bending
4) Doesn’t follow Hook’s law in bending
Ans: 2
19. In a beam of rectangular cross section, the ratio of the maximum shear stress to the average shear stress is
1) 2.50
2) 2.00
3) 1.50
4) 1.33
Ans: 3
20. The slenderness ratio of free standing column of length 4 m and 40mm x 40mm section is
1) 115.2
2) 230.4
3) 692.8
4) 346.8
Ans: 3
21. The ratio of maximum shear stress of a solid shaft of diameter D to that of a hollow shaft having external diameter D and internal diameter 0.5D is
1) 0.50
2) 1.00
3) 1.50
4) 0.94
Ans: 4
22. The reaction at a roller support of beam will be
1) Tangential to support
2) Normal to support
3) Unknown in direction
4) Inclined to support
Ans: 2
23. For a beam subjected to point loads, the shear force between point loads
1) is constant
2) varies linearly
3) has parabolic variation
4) always remain zero
Ans: 1
24. The method in which a single equation is formed for all loads on the beam and the equation constructed in such a way that the integral constants apply to all the sections of the beam is
1) Moment area method
2) Conjugate beam method
3) Macaulay’s method
4) 6method of super position
Ans: 3
25. What is poise?
1) Unit of viscosity
2) Dyne-sec/cm2
3) 0.1 times Ns/m2
4) All the above.
Ans: 4
26. Surface tension has the units of
1) Nm
2) N/m
3) N/m2
4) N/m3
Ans: 2
27. The ratio of specific heat of a gas at constant pressure and the specific heat of the gas at constant volume
1) is always constant
2) varies with temperature
3) varies with pressure
4) is not constant
Ans: 1
28. A perfect gas obeys
1) Boyle’s law only
2) Charles’ law only
3) both Boyle’s law and Charles’ law
4) None of the above
Ans: 3
29. The thermal efficiency of an engine, which is supplied heat at the rate of 15000 Nm/s and gives an output of 4500 W is
1) 45%
2) 50%
3) 30%
4) 33%
Ans: 3
30. Micro-manometer is used to
1) determine low pressure difference
2) determine higher pressure difference
3) pressure measurement for gases only
4) measure pressure in congested areas
Ans: 1
31. Prandlt’s Pitot tube measures
1) Stagnation head only
2) Pressure head only
3) Velocity head and Stagnation head
4) Pressure head and Stagnation head
Ans: 4
32. Based on principle of conservation of energy, the equation derived for an ideal fluid is
1) Bernoulle’s Equation
2) Newton’s Law of Viscosity
3) Impulse – momentum equation
4) Continuity equation
Ans: 1
33. Mouthpiece has increased net head when compared to small orifice due to
1) turbulence in the tube
2) vena contracta occurred within the tube
3) smaller length of the tube
4) smooth boundary of the tube
Ans: 2
34. If Velocity potential satisfies Laplace equation the flow will be
1) Irrotational flow
2) Free vortex flow
3) Continuous flow
4) Forced vortex flow
Ans: 3
35. The ratio of viscous forces to inertial forces is called
1) Mach number
2) Weber number
3) Reynolds number
4) Froude number
Ans: 3
36. If the position of meta centre remain lower than centre of gravity of the floating body, the body will remain in a state of
1) Stable equilibrium
2) Unstable equilibrium
3) Neutral equilibrium
4) None of the above
Ans: 2
37. The discharge from a centrifugal pump is 100 lpm and the leakage is 11 lpm. Then the volumetric efficiency of the pump is
1) 89%
2) 90%
3) 99%
4) 80%
Ans: 2
38. Draft tube for a reaction turbine is arranged for
1) Safety purpose only
2) Increasing velocity head
3) Converting kinetic head into pressure head
4) Diverting water only
Ans: 3
39. Which hydraulic turbine more efficient at part load operation?
1) Pelton wheel
2) Francis turbine
3) Propeller turbine
4) Kaplan turbine
Ans: 4
40. The cavitation parameter σ is defined in terms of net positive suction head (NPSH) and net head H as
1) NPSH/√H
2) H/NPSH
3) H/√NPSH
4) NPSH/H
Ans: 4
41. The momentum correction factor is used to account for
1) Change in direction of flow
2) Change in pressure
3) Non uniform distribution of velocity
4) Unsteady flow
Ans: 3
42. Centre of Pressure is
1) Always below the centroid of the submerged plane
2) Always at the centroid of the submerged plane
3) Always above the centroid of the submerged plane
4) Anywhere with respect to the centroid of the submerged plane
Ans: 1
43. What is a condition for a hydraulically efficient channel?
1) Minimum flow rate.
2) Maximum wetted perimeter
3) Constant velocity.
4) Minimum wetted perimeter.
Ans: 4
1) Zero
2) Constant
3) Always anticlockwise
4) Always clockwise
Ans: 2
11. If the number of members (m) in a frame having joints (j) is more than that required by the equation m=2j-3, then such frames called
1) Ideal frame
2) Imperfect frame
3) Perfect frame
4) Redundant frame
Ans: 4
12. Hoop stress for a wooden wheel with steel flat tyre in terms of outside diameter of the wheel D, inside diameter of the tyre d and Young’s modulus E is
1) E(D-d)/d
2) E(D/d)
3) E(D/(D-d))
4) E(d/D)
Ans: 1
13. Relation between the elastic constants E and C for poisson’s ratio of 0.25 is
1) E=10C
2) E=5C
3) E=2.5C
4) E=0.25C
Ans: 3
14. The radius of Mohr’s circle represents
1) Minimum normal stress
2) Maximum normal stress
3) Minimum shear stress
4) Maximum shear stress
Ans: 4
15. For an inclined plane in a rectangular block subjected to two mutually perpendicular normal stresses 1000 MPa and 400 MPa and shear stresses 400 MPa, the maximum normal stress will be
1) 1200 MPa
2) 700 MPa
3) 600 MPa
4) 200 MPa
Ans: 1
16. At a hinge in a beam
1) Shear force is zero
2) Bending moment is maximum
3) Bending moment is zero
4) Bending moment changes sign
Ans: 3
17. The bending moment for a beam with equal overhangs and carrying equal point loads each of P at the free ends, the shear force for the beam portion between the supports is
1) Zero
2) equal to P
3) Linearly varying from –P to +P
4) Linearly varying from 0 to P
Ans: 1
18. Assumption made in the theory of bending is
1) Radius of curvature is small
2) Radius of curvature is large
3) Transverse sections of the beam do not remain plane after
bending
4) Doesn’t follow Hook’s law in bending
Ans: 2
19. In a beam of rectangular cross section, the ratio of the maximum shear stress to the average shear stress is
1) 2.50
2) 2.00
3) 1.50
4) 1.33
Ans: 3
20. The slenderness ratio of free standing column of length 4 m and 40mm x 40mm section is
1) 115.2
2) 230.4
3) 692.8
4) 346.8
Ans: 3
21. The ratio of maximum shear stress of a solid shaft of diameter D to that of a hollow shaft having external diameter D and internal diameter 0.5D is
1) 0.50
2) 1.00
3) 1.50
4) 0.94
Ans: 4
22. The reaction at a roller support of beam will be
1) Tangential to support
2) Normal to support
3) Unknown in direction
4) Inclined to support
Ans: 2
23. For a beam subjected to point loads, the shear force between point loads
1) is constant
2) varies linearly
3) has parabolic variation
4) always remain zero
Ans: 1
24. The method in which a single equation is formed for all loads on the beam and the equation constructed in such a way that the integral constants apply to all the sections of the beam is
1) Moment area method
2) Conjugate beam method
3) Macaulay’s method
4) 6method of super position
Ans: 3
25. What is poise?
1) Unit of viscosity
2) Dyne-sec/cm2
3) 0.1 times Ns/m2
4) All the above.
Ans: 4
26. Surface tension has the units of
1) Nm
2) N/m
3) N/m2
4) N/m3
Ans: 2
27. The ratio of specific heat of a gas at constant pressure and the specific heat of the gas at constant volume
1) is always constant
2) varies with temperature
3) varies with pressure
4) is not constant
Ans: 1
28. A perfect gas obeys
1) Boyle’s law only
2) Charles’ law only
3) both Boyle’s law and Charles’ law
4) None of the above
Ans: 3
29. The thermal efficiency of an engine, which is supplied heat at the rate of 15000 Nm/s and gives an output of 4500 W is
1) 45%
2) 50%
3) 30%
4) 33%
Ans: 3
30. Micro-manometer is used to
1) determine low pressure difference
2) determine higher pressure difference
3) pressure measurement for gases only
4) measure pressure in congested areas
Ans: 1
31. Prandlt’s Pitot tube measures
1) Stagnation head only
2) Pressure head only
3) Velocity head and Stagnation head
4) Pressure head and Stagnation head
Ans: 4
32. Based on principle of conservation of energy, the equation derived for an ideal fluid is
1) Bernoulle’s Equation
2) Newton’s Law of Viscosity
3) Impulse – momentum equation
4) Continuity equation
Ans: 1
33. Mouthpiece has increased net head when compared to small orifice due to
1) turbulence in the tube
2) vena contracta occurred within the tube
3) smaller length of the tube
4) smooth boundary of the tube
Ans: 2
34. If Velocity potential satisfies Laplace equation the flow will be
1) Irrotational flow
2) Free vortex flow
3) Continuous flow
4) Forced vortex flow
Ans: 3
35. The ratio of viscous forces to inertial forces is called
1) Mach number
2) Weber number
3) Reynolds number
4) Froude number
Ans: 3
36. If the position of meta centre remain lower than centre of gravity of the floating body, the body will remain in a state of
1) Stable equilibrium
2) Unstable equilibrium
3) Neutral equilibrium
4) None of the above
Ans: 2
37. The discharge from a centrifugal pump is 100 lpm and the leakage is 11 lpm. Then the volumetric efficiency of the pump is
1) 89%
2) 90%
3) 99%
4) 80%
Ans: 2
38. Draft tube for a reaction turbine is arranged for
1) Safety purpose only
2) Increasing velocity head
3) Converting kinetic head into pressure head
4) Diverting water only
Ans: 3
39. Which hydraulic turbine more efficient at part load operation?
1) Pelton wheel
2) Francis turbine
3) Propeller turbine
4) Kaplan turbine
Ans: 4
40. The cavitation parameter σ is defined in terms of net positive suction head (NPSH) and net head H as
1) NPSH/√H
2) H/NPSH
3) H/√NPSH
4) NPSH/H
Ans: 4
41. The momentum correction factor is used to account for
1) Change in direction of flow
2) Change in pressure
3) Non uniform distribution of velocity
4) Unsteady flow
Ans: 3
42. Centre of Pressure is
1) Always below the centroid of the submerged plane
2) Always at the centroid of the submerged plane
3) Always above the centroid of the submerged plane
4) Anywhere with respect to the centroid of the submerged plane
Ans: 1
43. What is a condition for a hydraulically efficient channel?
1) Minimum flow rate.
2) Maximum wetted perimeter
3) Constant velocity.
4) Minimum wetted perimeter.
Ans: 4
44. Work done in a free expansion process is
a. Maximum
b. Negative
c. Positive
d. Zero
Ans: d
45. Which of the following is not a path function
a. Thermal conductivity
b. Kinetic Energy
c. Heat
d. Work
Ans: a
46. Under ideal conditions, isothermal, isobaric, isochoric and adiabatic process a
a. Stable process
b. Quasi static process
c. Thermodynamic process
d. Dynamic process
Ans: b
47. Carnot cycle has maximum efficiency for
a. Petrol Engine
b. Diesel Engine
c. Reversible Engine
d. Irreversible Engine
Ans: c
48. Change of entropy depends upon change of
a. Heat
b. Specific heats
d. Temperature
e. Mass
Ans: a
49. A petrol engine theoretically operates
a. Constant Temperature Cycle
b. Constant Volume Cycle
c. Constant Pressure Cycle
d. Mixed cycle of constant pressure and constant volume
Ans: b
50. Insulation in cavity walls is
a. Cork
b. Wood
c. Air
d. Water
Ans: c
a. Maximum
b. Negative
c. Positive
d. Zero
Ans: d
45. Which of the following is not a path function
a. Thermal conductivity
b. Kinetic Energy
c. Heat
d. Work
Ans: a
46. Under ideal conditions, isothermal, isobaric, isochoric and adiabatic process a
a. Stable process
b. Quasi static process
c. Thermodynamic process
d. Dynamic process
Ans: b
47. Carnot cycle has maximum efficiency for
a. Petrol Engine
b. Diesel Engine
c. Reversible Engine
d. Irreversible Engine
Ans: c
48. Change of entropy depends upon change of
a. Heat
b. Specific heats
d. Temperature
e. Mass
Ans: a
49. A petrol engine theoretically operates
a. Constant Temperature Cycle
b. Constant Volume Cycle
c. Constant Pressure Cycle
d. Mixed cycle of constant pressure and constant volume
Ans: b
50. Insulation in cavity walls is
a. Cork
b. Wood
c. Air
d. Water
Ans: c
51. In a refrigeration cycle heat is ______________by a refrigerant in evaporator and heat is _______________by refrigerant in a condenser.
a. Absorbed, Absorbed
b. Absorbed, Rejected
c. Rejected, Absorbed
d. Rejected, Rejected
Ans: b
52. Moisture in Freon refrigeration system causes
a. Ineffective refrigeration
b. Breakdown of refrigerant
c. Corrosion of whole system
d. Freezing automatic regulating valve
Ans: d
53. The purpose of installing a flash chamber in the refrigeration circuit is to
a. Improve overall heat transfer coefficient
b. Reduce pressure losses through evaporator
c. Reduce the size of evaporator by avoiding vapours going to evaporator
d. All the above
Ans: d
54. The saturation temperature of the water at the partial pressure of water vapour in the air vapour mixture is known as
a. Dry bulb temperature
b. Wet bulb temperature
c. Dew point temperature
d. Saturation temperature
Ans: c
55. Fouling factor is used
a. In heat exchanger design as a safety factor
b. In case of Newtonian fluids
c. When a liquid exchanges heat with a gas.
d. None of the above
Ans: a
56. The formation of frost on cooling coils in a refrigerator
a. Increases heat transfer
b. Improves C.O.P. of the system
c. Reduces power consumption
d. Increases power consumption
Ans: d
57. The capacity of a refrigerator is one tone. This means that the heat removing capacity of the refrigerator is
a. 1000 kCal/hr
b. 2000 kCal/hr
c. 3000 kCal/hr
d. 4000 kCal/hr
Ans: c
58. De laval turbine is used for applications requiring
a. Low power, low speed
b. Low power, high speed
c. High power, high speed
d. High power, low speed
Ans: b
59. Phenomenon of Chocking in compressor means
a. No flow of air
b. Fixed mass flow rate regardless of pressure ratio
c. Reducing mass flow rate with increasing pressure ratio
d. Increased inclination of chord with air steam
Ans: b
60. The number of fire tubes in a Cochran boiler are
a. 75
b. 115
c. 165
d. 225
Ans: c
61. In case of Worm Wheel and Worm the maximum efficiency is obtained when
a. Either Worm or Worm Wheel is driver
b. Worm Wheel is driver
c. Worm is driver
d. Depends on other factors
Ans: a
62. Idler Pulley is used for
a. For running during idle periods only
b. Changing Direction of rotation
c. For stopping motion frequently
d. Maintaining Belt Tension
Ans: d
63. The throw of a Cam is the maximum distance of the follower from
a. Root Circle
b. Base circle
c. Pitch circle
d. Staring to finish
Ans: b
64. The sum of the tensions when the belt is running on the pulley is
a. Less than the initial tension
b. More than the initial tension
c. Half the initial tension
d. More than twice the initial tension
Ans: d
65. Which of the following key transmits power through frictional resistance only
a. Woodruff key
b. Sunk key
c. Saddle key
d. Tangent key
Ans: c
66. For the analysis of thick cylinders, the theory applicable is
a. Lame’s theory
b. Rankine’s theory
c. Poisson’s theory
d. Courbon’s theory
Ans: a
67. Stress concentration may be caused by
a. Change in cross sectional area
b. Change in shape
c. Change in dimension
d. A hole or a notch in the body
Ans: d
68. The Solderberg line for ductile materials gives upper limit for
a. Any combination of mean and alternating stress.
b. Alternating Compressive stress
c. Alternating tensile stress
d. Mean stress
Ans: a
69. Gears of watches are generally manufactured by
a. Powder Metallurgy
b. Machining on Gear Shaper
c. Die Casting
d. Stamping
Ans: d
70. Autofrettage is a
a. Surface coating process
b. A means of inducing favorable residual stress in pressure vessels
c. Extra cover provided on seamless tubes
d. A heat treatment for pressure vessels subjected to low temperature
Ans: b
71. Hot tear
a. Is a physical property of non ferrous metals
b. Is a process involving heat
c. Is a phenomenon occurring in materials exposed
d. Is a defect in casting
Ans: d
72. The loss of strength in compression which occurs when there is a gain in strength in the tension due to over loading is
a. Isostrain
b. Relaxation
c. Hysteresis
d. Shock absorption
Ans: c
73. Cold heading is a process as
a. Chipless machining
b. Explosive forming
c. High energy ratio forming
d. Electro machining process
Ans: a
74. Cores are used
a. In symmetrical casting only
b. To get smooth surface on casting
c. To get cavity or recess in cavity
d. To strengthen mould
Ans: d
75. A soldering iron is used mainly to
a. Heat the metal
b. Melt the solder
c. Heat the flex
d. None
Ans: b
76. The accuracy of a limit gauge can be checked by
a. Sine bar
b. Micrometer
c. Slip gauge
d. Vernier calipers
Ans: c
77. A piercing operation in which the entire contour is not cut is known as
a. Burnishing
b. Broaching
c. Notching
d. Lancing
Ans: d
78. In which one of the following machining manual part programming is done?
a. NC machining
b. CNC machining
c. DNC machining
d. FMS machining
Ans: a
79. Production Flow Analysis (PFA) is a method of identifying part families that uses data from
a. Engineering drawings
b. Production schedule
c. Bill of material
d. Route sheets
Ans: b
80. Flexible manufacturing systems are generally applied in
a. High variety and low volume production
b. High variety and high volume production
c. Low variety and low volume production
d. Medium volume and medium variety production
Ans: d
81. Which of the following is not a part of inventory carrying cost
a. Cost of inwards goods inspection
b. Cost of obsolescence
c. Cost of insurance
d. Cost of storage space
Ans: a
82. Which two disciplines are usually tied by a common data base
a. Documentation and geometric modeling
b. Drafting and documentation
c. CAD and CAM
d. Testing and analysis.
Ans: c
83. Group Technology brings together and organizes
a. Common parts, problems and tasks
b. Automation and tool production
c. Documentation and analysis
d. Parts and simulation analysis.
Ans: a
84. A display of a 3-dimensional model that shows all of its edges is known as
a. 2-D model
b. 3-D model
c. Wire frame
d. Solid model
Ans: c
85. Which one of the following statements is not correct?
a. PERT is probabilistic and CPM is deterministic
b. In PERT, events are used and in CPM activities are used.
c. In CPM, crashing is carried out
d. In CPM, the probability to complete the project in a given duration is calculated.
Ans: d
86. In time study, the rating factor is applied to determine
a. Standard time of a job
b. Normal time of a job
c. Merit rating of the worker
d. Fixation of incentive rate
Ans: b
87. Only two symbols are used to draw the following chart
a. Flow process chart
b. Man-machine chart
c. Outline process chart
d. Two-handed chart
Ans: c
88. The subdivision of an operation into Therbligs and their analysis is known as
a. Work study
b. Time study
c. Micro motion study
d. None
Ans: c
89. According to the Emerson plan, a worker gets a bonus whenever the efficiency of a worker is more than
a. 50%
b. 55%
c. 60%
d. 66.67%
Ans: d
a. Absorbed, Absorbed
b. Absorbed, Rejected
c. Rejected, Absorbed
d. Rejected, Rejected
Ans: b
52. Moisture in Freon refrigeration system causes
a. Ineffective refrigeration
b. Breakdown of refrigerant
c. Corrosion of whole system
d. Freezing automatic regulating valve
Ans: d
53. The purpose of installing a flash chamber in the refrigeration circuit is to
a. Improve overall heat transfer coefficient
b. Reduce pressure losses through evaporator
c. Reduce the size of evaporator by avoiding vapours going to evaporator
d. All the above
Ans: d
54. The saturation temperature of the water at the partial pressure of water vapour in the air vapour mixture is known as
a. Dry bulb temperature
b. Wet bulb temperature
c. Dew point temperature
d. Saturation temperature
Ans: c
55. Fouling factor is used
a. In heat exchanger design as a safety factor
b. In case of Newtonian fluids
c. When a liquid exchanges heat with a gas.
d. None of the above
Ans: a
56. The formation of frost on cooling coils in a refrigerator
a. Increases heat transfer
b. Improves C.O.P. of the system
c. Reduces power consumption
d. Increases power consumption
Ans: d
57. The capacity of a refrigerator is one tone. This means that the heat removing capacity of the refrigerator is
a. 1000 kCal/hr
b. 2000 kCal/hr
c. 3000 kCal/hr
d. 4000 kCal/hr
Ans: c
58. De laval turbine is used for applications requiring
a. Low power, low speed
b. Low power, high speed
c. High power, high speed
d. High power, low speed
Ans: b
59. Phenomenon of Chocking in compressor means
a. No flow of air
b. Fixed mass flow rate regardless of pressure ratio
c. Reducing mass flow rate with increasing pressure ratio
d. Increased inclination of chord with air steam
Ans: b
60. The number of fire tubes in a Cochran boiler are
a. 75
b. 115
c. 165
d. 225
Ans: c
61. In case of Worm Wheel and Worm the maximum efficiency is obtained when
a. Either Worm or Worm Wheel is driver
b. Worm Wheel is driver
c. Worm is driver
d. Depends on other factors
Ans: a
62. Idler Pulley is used for
a. For running during idle periods only
b. Changing Direction of rotation
c. For stopping motion frequently
d. Maintaining Belt Tension
Ans: d
63. The throw of a Cam is the maximum distance of the follower from
a. Root Circle
b. Base circle
c. Pitch circle
d. Staring to finish
Ans: b
64. The sum of the tensions when the belt is running on the pulley is
a. Less than the initial tension
b. More than the initial tension
c. Half the initial tension
d. More than twice the initial tension
Ans: d
65. Which of the following key transmits power through frictional resistance only
a. Woodruff key
b. Sunk key
c. Saddle key
d. Tangent key
Ans: c
66. For the analysis of thick cylinders, the theory applicable is
a. Lame’s theory
b. Rankine’s theory
c. Poisson’s theory
d. Courbon’s theory
Ans: a
67. Stress concentration may be caused by
a. Change in cross sectional area
b. Change in shape
c. Change in dimension
d. A hole or a notch in the body
Ans: d
68. The Solderberg line for ductile materials gives upper limit for
a. Any combination of mean and alternating stress.
b. Alternating Compressive stress
c. Alternating tensile stress
d. Mean stress
Ans: a
69. Gears of watches are generally manufactured by
a. Powder Metallurgy
b. Machining on Gear Shaper
c. Die Casting
d. Stamping
Ans: d
70. Autofrettage is a
a. Surface coating process
b. A means of inducing favorable residual stress in pressure vessels
c. Extra cover provided on seamless tubes
d. A heat treatment for pressure vessels subjected to low temperature
Ans: b
71. Hot tear
a. Is a physical property of non ferrous metals
b. Is a process involving heat
c. Is a phenomenon occurring in materials exposed
d. Is a defect in casting
Ans: d
72. The loss of strength in compression which occurs when there is a gain in strength in the tension due to over loading is
a. Isostrain
b. Relaxation
c. Hysteresis
d. Shock absorption
Ans: c
73. Cold heading is a process as
a. Chipless machining
b. Explosive forming
c. High energy ratio forming
d. Electro machining process
Ans: a
74. Cores are used
a. In symmetrical casting only
b. To get smooth surface on casting
c. To get cavity or recess in cavity
d. To strengthen mould
Ans: d
75. A soldering iron is used mainly to
a. Heat the metal
b. Melt the solder
c. Heat the flex
d. None
Ans: b
76. The accuracy of a limit gauge can be checked by
a. Sine bar
b. Micrometer
c. Slip gauge
d. Vernier calipers
Ans: c
77. A piercing operation in which the entire contour is not cut is known as
a. Burnishing
b. Broaching
c. Notching
d. Lancing
Ans: d
78. In which one of the following machining manual part programming is done?
a. NC machining
b. CNC machining
c. DNC machining
d. FMS machining
Ans: a
79. Production Flow Analysis (PFA) is a method of identifying part families that uses data from
a. Engineering drawings
b. Production schedule
c. Bill of material
d. Route sheets
Ans: b
80. Flexible manufacturing systems are generally applied in
a. High variety and low volume production
b. High variety and high volume production
c. Low variety and low volume production
d. Medium volume and medium variety production
Ans: d
81. Which of the following is not a part of inventory carrying cost
a. Cost of inwards goods inspection
b. Cost of obsolescence
c. Cost of insurance
d. Cost of storage space
Ans: a
82. Which two disciplines are usually tied by a common data base
a. Documentation and geometric modeling
b. Drafting and documentation
c. CAD and CAM
d. Testing and analysis.
Ans: c
83. Group Technology brings together and organizes
a. Common parts, problems and tasks
b. Automation and tool production
c. Documentation and analysis
d. Parts and simulation analysis.
Ans: a
84. A display of a 3-dimensional model that shows all of its edges is known as
a. 2-D model
b. 3-D model
c. Wire frame
d. Solid model
Ans: c
85. Which one of the following statements is not correct?
a. PERT is probabilistic and CPM is deterministic
b. In PERT, events are used and in CPM activities are used.
c. In CPM, crashing is carried out
d. In CPM, the probability to complete the project in a given duration is calculated.
Ans: d
86. In time study, the rating factor is applied to determine
a. Standard time of a job
b. Normal time of a job
c. Merit rating of the worker
d. Fixation of incentive rate
Ans: b
87. Only two symbols are used to draw the following chart
a. Flow process chart
b. Man-machine chart
c. Outline process chart
d. Two-handed chart
Ans: c
88. The subdivision of an operation into Therbligs and their analysis is known as
a. Work study
b. Time study
c. Micro motion study
d. None
Ans: c
89. According to the Emerson plan, a worker gets a bonus whenever the efficiency of a worker is more than
a. 50%
b. 55%
c. 60%
d. 66.67%
Ans: d
90. The method of calculating the various quantities and expenditure in particular job or process is called :
(A) Planning (B) Processing
(C) Estimation (D) None of these
Ans: C
91. In turning centre the spindle axis designated as :
(A) X axis (B) Y axis
(C) Imaginary axis (D) Z axis
Ans: D
92. In CNC machine operation work offset is also known as :
(A) Geometrical offset (B) Wear offset
(C) Zero offset (D) None of these
Ans: C
93. The CNC lathe bed ways are made of :
(A) Cast Iron (B) Wrought Iron
(C) High speed steel (D) None of these
Ans: A
94. The carbon percentage in high carbon steel is :
(A) 0.1 to 0.25% (B) 0.3 to 0.7%
(C) 0.15 to 0.3% (D) 0.7 to 1.4%
Ans: D
95. The property of material to retain its hardness at elevated temperature is known as :
(A) Vickers hardness (B) Cold hardness
(C) Brinell hardness (D) Red hardness
Ans: D
96. Milling cutter is mounded on :
(A) Spindle (B) Arbor
(C) Tool post (D) Saddle
Ans: B
97. Which feed is used for rough cutting?
(A) Large feed (B) Small feed
(C) Moderate feed (D) None of these
Ans: A
98. High speed steel contain :
(A) 18% chromium 4% tungsten 1% vanadium
(B) 18% tungsten 4% chromium 1% vanadium
(C) 18% tungsten 4% vanadium 1% chromium
(D) 18% vanadium 4% tungsten 1% chromium
Ans: C
99. Bin cards are used for
(a) Machine loading (b) Stores (c) Accounts (d) None of these
Ans: B
100. What does symbol "D" imply in work study ?
(a) Operation (b) Inspection (c) Transport (d) Permanent Storage
Ans: B
(A) Planning (B) Processing
(C) Estimation (D) None of these
Ans: C
91. In turning centre the spindle axis designated as :
(A) X axis (B) Y axis
(C) Imaginary axis (D) Z axis
Ans: D
92. In CNC machine operation work offset is also known as :
(A) Geometrical offset (B) Wear offset
(C) Zero offset (D) None of these
Ans: C
93. The CNC lathe bed ways are made of :
(A) Cast Iron (B) Wrought Iron
(C) High speed steel (D) None of these
Ans: A
94. The carbon percentage in high carbon steel is :
(A) 0.1 to 0.25% (B) 0.3 to 0.7%
(C) 0.15 to 0.3% (D) 0.7 to 1.4%
Ans: D
95. The property of material to retain its hardness at elevated temperature is known as :
(A) Vickers hardness (B) Cold hardness
(C) Brinell hardness (D) Red hardness
Ans: D
96. Milling cutter is mounded on :
(A) Spindle (B) Arbor
(C) Tool post (D) Saddle
Ans: B
97. Which feed is used for rough cutting?
(A) Large feed (B) Small feed
(C) Moderate feed (D) None of these
Ans: A
98. High speed steel contain :
(A) 18% chromium 4% tungsten 1% vanadium
(B) 18% tungsten 4% chromium 1% vanadium
(C) 18% tungsten 4% vanadium 1% chromium
(D) 18% vanadium 4% tungsten 1% chromium
Ans: C
99. Bin cards are used for
(a) Machine loading (b) Stores (c) Accounts (d) None of these
Ans: B
100. What does symbol "D" imply in work study ?
(a) Operation (b) Inspection (c) Transport (d) Permanent Storage
Ans: B
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