MECHANICAL ENGINEERING-PUMP OPERATION
MECHANICAL ENGINEERING- PUMP OPERATION MCQs
1. Second law of thermodynamics defines
(A) Heat (B) Work
(C) Enthalpy (D) Entropy
Ans: D
2. In a throttling process
(A) Volume remains constant (B) Pressure remains constant (C) Temperature remains constant (D) All the three remain constant
Ans: C
3. Spring index is
(A) Indication of quality of spring
(B) Load required to produce unit deflection
(C) Its capability of storing energy
(D) Ratio of coil diameter to wire diameter
Ans: D
4. The value of universal gas constant (Ru) is
(A) 8314 J/kgK (B) 8.314 J/kgK (C) 83.14 J/kgK (D) 831.4 J/kgK
Ans: A
5. For a reversible adiabatic process, change in entropy is
(A) Minimum (B) Maximum (C) Zero (D) Unpredictable
Ans: C
6. An isothermal process is governed by (A) Charle's law (B) Boyle's law (C) Joule's law (D) Gay-Lussac law
Ans: B
7. Which of the following processes is not associated with Diesel cycle? (A) Constant volume (B) Constant pressure (C) Adiabatic (D) Isothermal
Ans: D
8. Morse test is conducted only on (A) Variable speed engine (B) Low power engine (C) Multi-cylinder engine (D) Water cooled engine
Ans: C
9. Which of the following is the extensive property of the system? (A) Volume (B) Pressure (C) Temperature (D) Density
Ans: A
10. In a system, neither mass nor energy is allowed to cross the boundary of the system which is known as (A) Isentropic system (B) Isolated system (C) Isothermal system (D) Closed system
Ans: B
11. Unit of refrigeration is expressed in (A) Kilo joule (B) Kilo watt (C) Ton (D) Kilo pascal
Ans: C
12. Which part of the vapour compression refrigeration cycle produces the refrigeration effect? (A) Compressor (B) Condenser (C) Evaporator (D) None of the above
Ans: C
13. The wet bulb temperature is a measure of
(A) Relative humidity (B) Absolute humidity (C) Specific humidity (D) None of the above
Ans: B
14. Brine is always used as a secondary refrigerant in
(A) Milk chilling plants (B) Cold storage plants (C) Central air-conditioning plants (D) Ice plants
Ans: D
15. Mass of water vapour present in 1 kg of dry air is known as
(A) Relative humidity (B) Absolute humidity (C) Humidity ratio (D) Percentage humidity
Ans: C
16. Density of water is maximum at
(A) 0°C (B) 0°K (C) 100°C (D) 4°C
Ans: D
17. Stefan Boltzmann law is applicable for heat transfer by
(A) Conduction (B) Convection (C) Radiation (D) Conduction and radiation combined
Ans: C
18. If a body transmits all the radiations incident on it, then it is known as a
(A) Black body (B) White body (C) Grey body (D) Transparent body
Ans: D
19. Overall coefficient of heat transfer is used in case of
(A) Conduction (B) Convection (C) Radiation (D) Conduction & convection
Ans: D
20. The heat of Sun reaches Earth according to
(A) Conduction (B) Convection (C) Radiation (D) All of the above
Ans: C
21. Fluid is a substance which offers no resistance to change of
(A) Pressure (B) Flow (C) Shape (D) Volume
Ans: C
22. Surface tension has the unit of (A) N/m2 (B) N/m (C) N (D) Nm
Ans: B
23. The ratio of absolute viscosity to mass density is known as
(A) Kinematic viscosity (B) Specific viscosity (C) Viscosity index (D) Coefficient of viscosity
Ans: A
24. The centre of gravity of the volume of the liquid displaced by an immersed body is called
(A) Meta-centre (B) Centre of buoyancy (C) Centre of pressure (D) Centre of gravity
Ans: B
25. Manometer is used to measure
(A) Velocity of the fluid (B) Discharge of the fluid
(C) Density of the fluid (D) Pressure of the fluid
Ans: D
26. Bernoulli's equation deals with the law of conservation of
(A) Mass (B) Momentum
(C) Energy (D) Work
Ans: C
27. Maximum efficiency of transmission of power through a pipe is
(A) 100% (B) 33.3%
(C) 50% (D) 66.6%
Ans: D
28. Centrifugal pump is started with its delivery valve
(A) Kept fully closed (B) Kept fully open
(C) Kept 50% open (D) Irrespective of any position
Ans: A
29. For small discharge at high pressure, following pump is preferred
(A) Centrifugal (B) Axial flow
(C) Mixed flow (D) Reciprocating
Ans: D
30. Series operation of a centrifugal pump results in
(A) High head (B) High discharge
(C) High speed (D) Reduced power consumption
Ans: A
31. The pump to be used for pumping highly viscous fluids belongs to
(A) Centrifugal pump (B) Plunger pump
(C) Screw pump (D) Turbine pump
Ans: C
32. Slip is a term associated with
(A) Centrifugal pump (B) Submersible pump
(C) Reciprocating pump (D) Jet pump
Ans: C
33. The property of a material which allows it to be drawn into small section is called
(A) Plasticity (B) Elasticity
(C) Ductility (D) Malleability
Ans: C
34. Gear box of a car utilizes
(A) Simple train (B) Complex train
(C) Epicyclic gears (D) Compound train
Ans: D
35. Jet pumps are often used in process industry for their
(A) High efficiency (B) Large capacity (C) Easy maintenance (D) None of the above
Ans: C
36. Which pump would you select for pumping sewage?
(A) Reciprocating pump (B) Open impeller centrifugal pump (C) Multistage centrifugal pump (D) Screw pump
Ans: B
37. Pelton wheel turbine is
(A) Axial flow impulse turbine (B) Inward flow impulse turbine (C) Outward flow impulse turbine (D) Tangential flow impule turbine
Ans: D
38. A draft tube is used with
(A) Impulse turbine (B) Pelton wheel turbine (C) Reaction turbine (D) Axial turbine pumps
Ans: C
39. A material capable of absorbing large amount of energy before fracture is known as
(A) Ductility (B) Toughness (C) Resilience (D) Plasticity
Ans: B
40. The ratio of direct stress to volumetric strain is known as
(A) Bulk modulus (B) Modulus of rigidity (C) Poisson's ratio (D) Modulus of elasticity
Ans: A
41. When a close coiled spring is subjected to axial load, its axial deflection is directly proportional to
(A) Diameter of the wire
(B) Modulus of rigidity of the spring material
(C) Modulus of elasticity of the spring material
(D) Mean radius of the coil of the spring
Ans: D
42. The ratio of limiting friction to normal reaction between two bodies
(A) Static friction (B) Dynamic friction (C) Coefficient of friction (D) Limiting friction
Ans: C
43. Moment of inertia of an area is always least with respect to
(A) Bottom-most axis (B) Radius of gyration (C) Central axis (D) Centroidal axis
Ans: D
44. A cantilever beam of length 'I' carries a point load 'w' at the free end. The shear force diagram seems to be in the shape as
(A) A triangle (B) A rectangle
(C) Two equal and opposite triangles (D) Two equal and opposite rectangles
Ans: B
45. Impulse turbine is used for
(A) High head (B) Low head
(C) Medium head (D) High flow
Ans: A
46. Hoop stress in thin walled cylinder is
(A) Compressive stress (B) Radial stress (C) Circumferential tensile stress (D) Longitudinal stress
Ans: C
47. If d = diameter of the rivets and t = thickness of the plates to be riveted, then Unwin's formula can be expressed as
(A) d = 4√ t (B) d = 6√ t (C) d = 8√ t (D) d = 2√ t
Ans: B
48. A long column fails by
(A) Crushing (B) Tension (C) Shearing (D) Buckling
Ans: D
49. Cam size depends upon
(A) Base circle (B) Pitch circle (C) Prime circle (D) Outer circle
Ans: A
50. The ratio of number of teeth and pitch circle diameter is called
(A) Pitch (B) Circular pitch (C) Diametral pitch (D) Module
Ans: C
(A) Heat (B) Work
(C) Enthalpy (D) Entropy
Ans: D
2. In a throttling process
(A) Volume remains constant (B) Pressure remains constant (C) Temperature remains constant (D) All the three remain constant
Ans: C
3. Spring index is
(A) Indication of quality of spring
(B) Load required to produce unit deflection
(C) Its capability of storing energy
(D) Ratio of coil diameter to wire diameter
Ans: D
4. The value of universal gas constant (Ru) is
(A) 8314 J/kgK (B) 8.314 J/kgK (C) 83.14 J/kgK (D) 831.4 J/kgK
Ans: A
5. For a reversible adiabatic process, change in entropy is
(A) Minimum (B) Maximum (C) Zero (D) Unpredictable
Ans: C
6. An isothermal process is governed by (A) Charle's law (B) Boyle's law (C) Joule's law (D) Gay-Lussac law
Ans: B
7. Which of the following processes is not associated with Diesel cycle? (A) Constant volume (B) Constant pressure (C) Adiabatic (D) Isothermal
Ans: D
8. Morse test is conducted only on (A) Variable speed engine (B) Low power engine (C) Multi-cylinder engine (D) Water cooled engine
Ans: C
9. Which of the following is the extensive property of the system? (A) Volume (B) Pressure (C) Temperature (D) Density
Ans: A
10. In a system, neither mass nor energy is allowed to cross the boundary of the system which is known as (A) Isentropic system (B) Isolated system (C) Isothermal system (D) Closed system
Ans: B
11. Unit of refrigeration is expressed in (A) Kilo joule (B) Kilo watt (C) Ton (D) Kilo pascal
Ans: C
12. Which part of the vapour compression refrigeration cycle produces the refrigeration effect? (A) Compressor (B) Condenser (C) Evaporator (D) None of the above
Ans: C
13. The wet bulb temperature is a measure of
(A) Relative humidity (B) Absolute humidity (C) Specific humidity (D) None of the above
Ans: B
14. Brine is always used as a secondary refrigerant in
(A) Milk chilling plants (B) Cold storage plants (C) Central air-conditioning plants (D) Ice plants
Ans: D
15. Mass of water vapour present in 1 kg of dry air is known as
(A) Relative humidity (B) Absolute humidity (C) Humidity ratio (D) Percentage humidity
Ans: C
16. Density of water is maximum at
(A) 0°C (B) 0°K (C) 100°C (D) 4°C
Ans: D
17. Stefan Boltzmann law is applicable for heat transfer by
(A) Conduction (B) Convection (C) Radiation (D) Conduction and radiation combined
Ans: C
18. If a body transmits all the radiations incident on it, then it is known as a
(A) Black body (B) White body (C) Grey body (D) Transparent body
Ans: D
19. Overall coefficient of heat transfer is used in case of
(A) Conduction (B) Convection (C) Radiation (D) Conduction & convection
Ans: D
20. The heat of Sun reaches Earth according to
(A) Conduction (B) Convection (C) Radiation (D) All of the above
Ans: C
21. Fluid is a substance which offers no resistance to change of
(A) Pressure (B) Flow (C) Shape (D) Volume
Ans: C
22. Surface tension has the unit of (A) N/m2 (B) N/m (C) N (D) Nm
Ans: B
23. The ratio of absolute viscosity to mass density is known as
(A) Kinematic viscosity (B) Specific viscosity (C) Viscosity index (D) Coefficient of viscosity
Ans: A
24. The centre of gravity of the volume of the liquid displaced by an immersed body is called
(A) Meta-centre (B) Centre of buoyancy (C) Centre of pressure (D) Centre of gravity
Ans: B
25. Manometer is used to measure
(A) Velocity of the fluid (B) Discharge of the fluid
(C) Density of the fluid (D) Pressure of the fluid
Ans: D
26. Bernoulli's equation deals with the law of conservation of
(A) Mass (B) Momentum
(C) Energy (D) Work
Ans: C
27. Maximum efficiency of transmission of power through a pipe is
(A) 100% (B) 33.3%
(C) 50% (D) 66.6%
Ans: D
28. Centrifugal pump is started with its delivery valve
(A) Kept fully closed (B) Kept fully open
(C) Kept 50% open (D) Irrespective of any position
Ans: A
29. For small discharge at high pressure, following pump is preferred
(A) Centrifugal (B) Axial flow
(C) Mixed flow (D) Reciprocating
Ans: D
30. Series operation of a centrifugal pump results in
(A) High head (B) High discharge
(C) High speed (D) Reduced power consumption
Ans: A
31. The pump to be used for pumping highly viscous fluids belongs to
(A) Centrifugal pump (B) Plunger pump
(C) Screw pump (D) Turbine pump
Ans: C
32. Slip is a term associated with
(A) Centrifugal pump (B) Submersible pump
(C) Reciprocating pump (D) Jet pump
Ans: C
33. The property of a material which allows it to be drawn into small section is called
(A) Plasticity (B) Elasticity
(C) Ductility (D) Malleability
Ans: C
34. Gear box of a car utilizes
(A) Simple train (B) Complex train
(C) Epicyclic gears (D) Compound train
Ans: D
35. Jet pumps are often used in process industry for their
(A) High efficiency (B) Large capacity (C) Easy maintenance (D) None of the above
Ans: C
36. Which pump would you select for pumping sewage?
(A) Reciprocating pump (B) Open impeller centrifugal pump (C) Multistage centrifugal pump (D) Screw pump
Ans: B
37. Pelton wheel turbine is
(A) Axial flow impulse turbine (B) Inward flow impulse turbine (C) Outward flow impulse turbine (D) Tangential flow impule turbine
Ans: D
38. A draft tube is used with
(A) Impulse turbine (B) Pelton wheel turbine (C) Reaction turbine (D) Axial turbine pumps
Ans: C
39. A material capable of absorbing large amount of energy before fracture is known as
(A) Ductility (B) Toughness (C) Resilience (D) Plasticity
Ans: B
40. The ratio of direct stress to volumetric strain is known as
(A) Bulk modulus (B) Modulus of rigidity (C) Poisson's ratio (D) Modulus of elasticity
Ans: A
41. When a close coiled spring is subjected to axial load, its axial deflection is directly proportional to
(A) Diameter of the wire
(B) Modulus of rigidity of the spring material
(C) Modulus of elasticity of the spring material
(D) Mean radius of the coil of the spring
Ans: D
42. The ratio of limiting friction to normal reaction between two bodies
(A) Static friction (B) Dynamic friction (C) Coefficient of friction (D) Limiting friction
Ans: C
43. Moment of inertia of an area is always least with respect to
(A) Bottom-most axis (B) Radius of gyration (C) Central axis (D) Centroidal axis
Ans: D
44. A cantilever beam of length 'I' carries a point load 'w' at the free end. The shear force diagram seems to be in the shape as
(A) A triangle (B) A rectangle
(C) Two equal and opposite triangles (D) Two equal and opposite rectangles
Ans: B
45. Impulse turbine is used for
(A) High head (B) Low head
(C) Medium head (D) High flow
Ans: A
46. Hoop stress in thin walled cylinder is
(A) Compressive stress (B) Radial stress (C) Circumferential tensile stress (D) Longitudinal stress
Ans: C
47. If d = diameter of the rivets and t = thickness of the plates to be riveted, then Unwin's formula can be expressed as
(A) d = 4√ t (B) d = 6√ t (C) d = 8√ t (D) d = 2√ t
Ans: B
48. A long column fails by
(A) Crushing (B) Tension (C) Shearing (D) Buckling
Ans: D
49. Cam size depends upon
(A) Base circle (B) Pitch circle (C) Prime circle (D) Outer circle
Ans: A
50. The ratio of number of teeth and pitch circle diameter is called
(A) Pitch (B) Circular pitch (C) Diametral pitch (D) Module
Ans: C
51. The quality of a governor can be judged by its (A) Stability (B) Sensitivity (C) Effort and power (D) None of the aboveAns: D
52. In a flat belt drive, the belt is subjected to maximum tension 'T' and a centrifugal tension Tc. For maximum power transmission (A) T = Tc (B) T = 2Tc (C) T = 3Tc (D) T = 4Tc
Ans: C
53. Maximum efficiency of a Screw jack is a function of (A) Angle of friction (B) Load lifted (C) Helix angle (D) Effort
Ans: A
54. Pure iron is the structure of (A) Ferrite (B) Pearlite (C) Austenite (D) Ferrite and pearlite
Ans: A
55. The crystal structure of a gamma iron is (A) BCC (B) FCC (C) HCP (D) Cubic structure
Ans: B
56. Balls for ball bearings are made of (A) Cast iron (B) Mild steel (C) Stainless steel (D) Carbon-chrome steel
Ans: D
57. Pearlite is a combination of (A) Cementite and gamma iron (B) Ferrite and cementite (C) Ferrite and austenite (D) Ferrite and iron graphite
Ans: B
58. Indicator diagram of reciprocating pump is a graph between
(A) Flow vs swept volume
(B) Pressure in cylinder vs swept volume
(C) Flow vs speed
(D) Pressure vs speed
Ans: B
59. The product of Coupola furnace is called (A) Pig iron (B) Cast iron (C) Mild steel (D) Wrought iron
Ans: B
60. The material used for coating the electrode is called (A) Binder (B) Slag (C) Flux (D) Protective layer
Ans: C
61. Grey cast iron is best welded by (A) TIG Welding (B) MIG Welding (C) Arc Welding (D) Oxy-acetylene Welding
Ans: D
62. The following welding process uses consumable electrode (A) TIG Welding (B) MIG Welding (C) Thermit Welding (D) Gas Welding
Ans: B
63. Which of the following is not a heat treatment process? (A) Austempering (B) Martempering (C) Parkerizing (D) Cyaniding
Ans: C
64. Slag inclusion in casting is a (A) Surface defect (B) Internal defect (C) Crack (D) Notch
Ans: A
65. The stress-strain relation of the Newtonian fluid is (A) Linear (B) Parabolic (C) Hyperbolic (D) Inverse type
Ans: A
66. Lathe bed is usually made of (A) Structural steel (B) Stainless steel (C) Cast iron (D) Mild steel
Ans: C
67. Crater wear takes place in a single point cutting tool at (A) Flank (B) Side rake (C) Face (D) Tip
Ans: C
68. The arbor of the milling machine is used to hold (A) Cutting tool (B) Spindle (C) Work piece (D) Mandrel
Ans: A
69. Basic tool in work study is (A) Graph paper (B) Process chart (C) Planning chart (D) Stop watch
Ans: D
70. The most commonly used flame in gas welding is (A) Neutral (B) Oxidising (C) Carburising (D) All of the above
Ans: A
71. Gantt charts are used for (A) Forecasting sales (B) Production schedule (C) Scheduling and Routing (D) Linear Programming
Ans: B
72. Acceptance sampling is widely used in (A) Batch production (B) Job production (C) Mass production (D) All of the above
Ans: C
73. CPM is a technique which depends on (A) Time (B) Event (C) Activity (D) Work
Ans: C
74. The probability distribution of activity times in PERT follows the following distribution: (A) Normal (B) Beta (C) Binomial (D) Exponential
Ans: B
75. Simplex method is used for (A) Linear programming (B) Queuing theory (C) Network analysis (D) Value Engineering
Ans: A
76. Father of time study is (A) H.L. Gantt (B) F.W. Taylor (C) F.B. Gilberth (D) R.M. Barnes
Ans: B
77. ABC analysis deals with which of the following? (A) Controlling inventory costs money (B) Flow of material (C) Ordering schedule of job (D) None of the above
Ans: A
78. Bar charts are suitable for (A) Large projects (B) Major projects (C) Minor projects (D) None of the above
Ans: C
79. Lead screw with half nuts in a lathe free to rotate in both directions has (A) Whitworth threads (B) V-threads (C) Buttress threads (D) ACME threads
Ans: D
80. From the following, which term is connected with shaping machine? (A) Gear cutting mechanism (B) Quick return mechanism (C) Lead screw mechanism (D) Half nut mechanism
Ans: B
81. Heat and work are (A) Point functions (B) Path functions (C) Intensive properties (D) Extensive properties
Ans: B
82. A perfect gas at 27°C is heated at constant pressure till its volume is doubled. The final temperature is (A) 54°C (B) 108°C (C) 327°C (D) 600°C
Ans: C
83. In an isothermal process, the internal energy of gas molecules (A) Increases (B) Decreases (C) May increase or decrease (D) Remains constant
Ans: D
84. The operation of forcing additional air under pressure in the engine cylinder is known as (A) Supercharging (B) Scavenging (C) Turbulence (D) Pre-ignition
Ans: A
85. Ignition quality of petrol is expressed by (A) Octane number (B) Cetane number (C) Calorific value (D) Self-ignition temperature
Ans: A
86. A two-stroke engine is usually identified by (A) Size of flywheel (B) Weight of engine (C) Type of lubrication system (D) Absence of valves
Ans: D
87. Gas turbine works on (A) Carnot cycle (B) Brayton cycle (C) Rankine cycle (D) Erricson cycle
Ans: B
88. Critical temperature is the temperature above which (A) A gas will immediately liquefy (B) A gas will never liquefy (C) Water will evaporate (D) Water will never evaporate
Ans: B
89. Presence of moisture in a refrigerant affects the working of (A) Compressor (B) Condenser (C) Expansion valve (D) Evaporator
Ans: C
52. In a flat belt drive, the belt is subjected to maximum tension 'T' and a centrifugal tension Tc. For maximum power transmission (A) T = Tc (B) T = 2Tc (C) T = 3Tc (D) T = 4Tc
Ans: C
53. Maximum efficiency of a Screw jack is a function of (A) Angle of friction (B) Load lifted (C) Helix angle (D) Effort
Ans: A
54. Pure iron is the structure of (A) Ferrite (B) Pearlite (C) Austenite (D) Ferrite and pearlite
Ans: A
55. The crystal structure of a gamma iron is (A) BCC (B) FCC (C) HCP (D) Cubic structure
Ans: B
56. Balls for ball bearings are made of (A) Cast iron (B) Mild steel (C) Stainless steel (D) Carbon-chrome steel
Ans: D
57. Pearlite is a combination of (A) Cementite and gamma iron (B) Ferrite and cementite (C) Ferrite and austenite (D) Ferrite and iron graphite
Ans: B
58. Indicator diagram of reciprocating pump is a graph between
(A) Flow vs swept volume
(B) Pressure in cylinder vs swept volume
(C) Flow vs speed
(D) Pressure vs speed
Ans: B
59. The product of Coupola furnace is called (A) Pig iron (B) Cast iron (C) Mild steel (D) Wrought iron
Ans: B
60. The material used for coating the electrode is called (A) Binder (B) Slag (C) Flux (D) Protective layer
Ans: C
61. Grey cast iron is best welded by (A) TIG Welding (B) MIG Welding (C) Arc Welding (D) Oxy-acetylene Welding
Ans: D
62. The following welding process uses consumable electrode (A) TIG Welding (B) MIG Welding (C) Thermit Welding (D) Gas Welding
Ans: B
63. Which of the following is not a heat treatment process? (A) Austempering (B) Martempering (C) Parkerizing (D) Cyaniding
Ans: C
64. Slag inclusion in casting is a (A) Surface defect (B) Internal defect (C) Crack (D) Notch
Ans: A
65. The stress-strain relation of the Newtonian fluid is (A) Linear (B) Parabolic (C) Hyperbolic (D) Inverse type
Ans: A
66. Lathe bed is usually made of (A) Structural steel (B) Stainless steel (C) Cast iron (D) Mild steel
Ans: C
67. Crater wear takes place in a single point cutting tool at (A) Flank (B) Side rake (C) Face (D) Tip
Ans: C
68. The arbor of the milling machine is used to hold (A) Cutting tool (B) Spindle (C) Work piece (D) Mandrel
Ans: A
69. Basic tool in work study is (A) Graph paper (B) Process chart (C) Planning chart (D) Stop watch
Ans: D
70. The most commonly used flame in gas welding is (A) Neutral (B) Oxidising (C) Carburising (D) All of the above
Ans: A
71. Gantt charts are used for (A) Forecasting sales (B) Production schedule (C) Scheduling and Routing (D) Linear Programming
Ans: B
72. Acceptance sampling is widely used in (A) Batch production (B) Job production (C) Mass production (D) All of the above
Ans: C
73. CPM is a technique which depends on (A) Time (B) Event (C) Activity (D) Work
Ans: C
74. The probability distribution of activity times in PERT follows the following distribution: (A) Normal (B) Beta (C) Binomial (D) Exponential
Ans: B
75. Simplex method is used for (A) Linear programming (B) Queuing theory (C) Network analysis (D) Value Engineering
Ans: A
76. Father of time study is (A) H.L. Gantt (B) F.W. Taylor (C) F.B. Gilberth (D) R.M. Barnes
Ans: B
77. ABC analysis deals with which of the following? (A) Controlling inventory costs money (B) Flow of material (C) Ordering schedule of job (D) None of the above
Ans: A
78. Bar charts are suitable for (A) Large projects (B) Major projects (C) Minor projects (D) None of the above
Ans: C
79. Lead screw with half nuts in a lathe free to rotate in both directions has (A) Whitworth threads (B) V-threads (C) Buttress threads (D) ACME threads
Ans: D
80. From the following, which term is connected with shaping machine? (A) Gear cutting mechanism (B) Quick return mechanism (C) Lead screw mechanism (D) Half nut mechanism
Ans: B
81. Heat and work are (A) Point functions (B) Path functions (C) Intensive properties (D) Extensive properties
Ans: B
82. A perfect gas at 27°C is heated at constant pressure till its volume is doubled. The final temperature is (A) 54°C (B) 108°C (C) 327°C (D) 600°C
Ans: C
83. In an isothermal process, the internal energy of gas molecules (A) Increases (B) Decreases (C) May increase or decrease (D) Remains constant
Ans: D
84. The operation of forcing additional air under pressure in the engine cylinder is known as (A) Supercharging (B) Scavenging (C) Turbulence (D) Pre-ignition
Ans: A
85. Ignition quality of petrol is expressed by (A) Octane number (B) Cetane number (C) Calorific value (D) Self-ignition temperature
Ans: A
86. A two-stroke engine is usually identified by (A) Size of flywheel (B) Weight of engine (C) Type of lubrication system (D) Absence of valves
Ans: D
87. Gas turbine works on (A) Carnot cycle (B) Brayton cycle (C) Rankine cycle (D) Erricson cycle
Ans: B
88. Critical temperature is the temperature above which (A) A gas will immediately liquefy (B) A gas will never liquefy (C) Water will evaporate (D) Water will never evaporate
Ans: B
89. Presence of moisture in a refrigerant affects the working of (A) Compressor (B) Condenser (C) Expansion valve (D) Evaporator
Ans: C