MECHANICAL ENGINEERING- PAGE 21
Mechanical Engineering MCQs- Page 21
1. A hemispherical shape of diameter 1.5 m is provided in the bottom of a tank. If the depth of water above the horizontal floor of tank is 5 m. What is the magnitude of resultant force on hemisphere ?
A:-78 KN
B:-74 KN
C:-76 KN
D:-75 KN
Ans: A
2.Design of shafts made of brittle material is based on
A:-Guest's theory
B:-St. Venant's theory
C:-Von-mises theory
D:-Rankine's theory
Ans: D
3. The highest stress that a material can with stand for a specified length of time with out excessive deformation is called
A:-fatique strength
B:-endurance strength
C:-creep strength
D:-creep rupture strength
Ans: C
4. When the addenda of pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values then the length of path of contact is given by,
r pitch circle radius of pinion
R pitch circle radius of wheel
`Phi` pressure angle
A:-`((R+r) sinPhi)/(2)`
B:-`((R+r) cosPhi)/(2)`
C:-`((R+r) tanPhi)/(2)`
D:-`((R+r))/(2sinPhi```` ```
Ans: A
5. In a clock mechanism, the gear train used to connect minute hand to hour hand is
A:-Epicyclic gear train
B:-Reverted gear train
C:-Compound gear train
D:-Simple gear train
Ans: B
6. The angle between the direction of follower motion and a normal to pitch curve is called
A:-Pitch angle
B:-Prime angle
C:-Base angle
D:-Pressure angle
Ans: D
7. The ratio of height of Porter Governor (When length of arms and links are equal) to the height of Watt's Governor is m-mass of ball and M-mass of the load on sleeve.
A:-`(m)/(m+M)`
B:-`(M)/(m+M)`
C:-`(m+M)/(m)`
D:-`(m+M)/(M)`
Ans: C
8. To restore stable operating condition in a hydrodynamic journal bearing, when it encounters higher magnitude loads
A:-Oil viscosity is to be decreased
B:-Oil viscosity is to be increased
C:-Oil viscosity index is to be increased
D:-Oil viscosity index is to be decreased
Ans: B
9. A flywheel of moment of inertia 9-8 Kg`m^(2)` fluctuates by 30 rpm for a fluctuation of energy of 19360 J. The mean speed of the flywheel is in rpm
A:-600
B:-900
C:-968
D:-2940
Ans: A
10. The number of elastic constants for a completely anisotropic elastic material are
A:-3
B:-4
C:-21
D:-25
Ans: C
11. Angle on which strength of the tool depends is
A:-lip angle
B:-rake angle
C:-cutting angle
D:-clearance angle
Ans: B
12. Drilling can be termed as
A:-Oblique cutting
B:-Simple cutting
C:-Orthogonal cutting
D:-Uniform cutting
Ans: A
13. In APT language, the cutter motion in incremental cordinate mode is addressed as
A:-GO TO/...
B:-GO/TO...
C:-GO DL TA/...
D:-GO FWD/...
Ans: B
14. The critical depth of a rectangular channel of width 4 m and discharge of `12m^(3)`/sec is equal to
A:-0.972 mm
B:-300 mm
C:-30 mm
D:-674 mm
Ans: A
15. Flow can be considered as incompressible flow
A:-When mach number less than 0.3
B:-When mach number in between 0.3 and 1
C:-When mach number greater than 1
D:-When mach number equal to 1
Ans: A
16. In a doublet equipotential lines are
A:-Circles tangent to y-axis
B:-Circles tangent to x-axis
C:-Concentric circles with centre on y-axis
D:-Concentric circle with centre on x-axis
Ans: A
17. What is the value of momentum correction factor for a turbulant flow in a pipe ?
A:-greater than 1
B:-1.02-1.05
C:-1.33
D:-2.00
Ans: B
18. When maximum power is transmitted through the pipe, the relation between Total Head Supplied (H) and Head loss due to friction `(H_(L))` is
A:-`H_(L)` = `H//2`
B:-`H_(L)` = `H//4`
C:-`H_(L)` = `H//3`
D:-`H_(L)`= H
Ans: C
19. What will be the number of buckets on the periphery of Pelton Wheel Runner, If 'D' is the diameter of wheel and 'd' is the diameter of the jet ?
A:-`D//2d` + 10
B:-`(D)/(2d)` +12
C:-`(D)/(2d)`+14
D:-`(D)/(2d)`+15
Ans: D
20. What is the maximum efficiency of a jet striking a single plate moving in the direction of jet is
A:-`(4)/(27)`
B:-`(6)/(27)`
C:-`(1)/(2)`
D:-`8//27`
Ans: D
21. For Francis Turbine Thoma's critical cavitation factor `sigma_(C)` can be related to specific speed as
A:-0.30 + 0.0036 `((N_S)/(100))^(2.73)`
B:-0.30 + 0.0036 `((N_S)/(100))`
C:-0.0431 `((N_S)/(100))^(2)`
D:-0.0431`(N_S//100)`
Ans: C
22. What is the least diameter of impeller in a centrifugal pump to commense the flow, where Hm is the manometric head N is the speed of impeller ?
A:-`(97.7Hm)/(N)`
B:-`(97.7Hm)/(sqrt(N))`
C:-`(97.7sqrt(Hm))/(N)`
D:-`(97.7sqrt(N))/(Hm)`
Ans: C
23. When an air vessel is fitted in a double acting Reciprocating pump, percentage workdoneper stroke saved against friction is
A:-84.8%
B:-39.2%
C:-46.4%
D:-76.4%
Ans: B
24. Q `->` Discharge from supply tank to valve box
q `->` Discharge from valve box to delivery tank
H `->` Height of water in discharge tank above valve box
h `->` Height of water in supply tank above valve box
Then D' Aubuisson's efficiency of a hydraulic Ram is
A:-`(Qh)/(qH)`
B:-`(Qq)/(Hh)`
C:-`(qH)/((Q-q)h)`
D:-`(qH)/(Qh)`
Ans: D
25. The octane number of following fuel is 100 : (A) N heptane (B) butane (C) cetane (D) iso octane
Ans: D
26. The reversible engine has thermal efficiency of 20%. What will be the COP if it is used as a refrigerator with other conditions unchanged : (A) 2 (B) 3.33 (C) 4 (D) 4.5
Ans: C
27. The property which is valid for prediction but not valid for forecasting is : (A) Subjective (B) Reproducible (C) Scientific (D) None of the above
Ans: A
28. The component which is not always in contact with fly wheel is : (A) crank shaft (B) friction plate (C) pressure plate (D) clutch cover
Ans: B
29. Draft tube is not mandatory for the following turbine : (A) Francis turbine (B) Pelton turbine (C) Keplan turbine (D) Deraiz turbine
Ans: B
30. The wet bulb depression decreases as : (A) Humidity increases (B) Humidity decreases (C) Temperature become 0C (D) None of the above
Ans: A
31. The method of forecasting which is used when past data is not available is : (A) Delphi method (B) Trend line technique (C) Historical analogy (D) None of these
Ans: A
32. When the water level falls below the safe limit the following device will extinguish the fire in the furnace of the boiler? (A) fusible plug (B) safety valve (C) blow off cock (D) feed check valve
Ans: A
33. The ability of the material to withstand shock is called : (A) ductility (B) toughness (C) hardness (D) fatigue strength
Ans: B
34. The following alloying element will increase the corrosion resistance of steel : (A) Titanium (B) Nickel (C) Chromium (D) Manganese
Ans: C
35. The part used to support the core in mould is called : (A) Chaplet (B) Slick (C) Lifter (D) Binder
Ans: A
36. The angle at the point of drill bit is : (A) 102 (B) 118 (C) 130 (D) 135
Ans: B
37. The process of embossing the diamond shaped pattern on work piece is called : (A) chamfering (B) parting (C) facing (D) knurling
Ans: D
38. The process of reducing activity time by adding resources resulting in the increase of cost is called : (A) reducing (B) updating (C) optimising (D) crashing
Ans: D
39. The PERT has an optimistic time of 4 days pessimistic time of 16 days and expected time of 10 days. The likely time of activity is : (A) 14 (B) 12 (C) 10 (D) 8
Ans: C
40. In cam shaft drive mechanism camshaft rotates in the reverse direction of the crankshaft in
(A) gear drive (B) chain drive (C) belt drive (D) gear drive with idler gear
Ans: A
41. In a 4 stroke diesel engine the number of teeth of the camshaft sprocket is _____ the number of teeth of sprocket on crankshaft.
(A) same (B) double (C) half (D) none of these
Ans: B
42. The maximum wear of the bore occurred at
(A) top non-thrust side (B) top thrust side (C) bottom non-thrust side (D) bottom thrust side
Ans: B
43. At the end of combustion the temperature inside cylinder will reach approximately
(A) 400° C (B) 800° C (C) 2200° C (D) 100° C
Ans: C
44. In automobile engines the water pump used in cooling system is
(A) gear type (B) centrifugal type (C) plunger type (D) vane type
Ans: B
45. The _____ helps to bring the cold engine to working temperature quickly.
(A) thermostat (B) cooling fins (C) radiator (D) water pump
Ans: A
46. In higher altitude, the water boils at
(A) 100° C (B) below 100° C (C) above 100° C (D) 4° C
Ans: B
47. Oil pumps are driven by
(A) electricity (B) crank-shaft (C) cam-shaft (D) vacuum
Ans: C
48. To limit the max pressure of the oil in lubrication system
(A) pump stops when limit reached (B) relay provided to disconnect pump
(C) a pressure relief valve provided (D) none of these
Ans: C
49. In muffler assembly catalytic converter is provided to
(A) increase power (B) reduce noise (C) reduce pollution (D) none of these
Ans: C
50. Drive of the mechanical fuel pump is getting from _____
(A) crank-shaft (B) cam-shaft (C) connecting rod (D) timing gear
Ans: B
A:-78 KN
B:-74 KN
C:-76 KN
D:-75 KN
Ans: A
2.Design of shafts made of brittle material is based on
A:-Guest's theory
B:-St. Venant's theory
C:-Von-mises theory
D:-Rankine's theory
Ans: D
3. The highest stress that a material can with stand for a specified length of time with out excessive deformation is called
A:-fatique strength
B:-endurance strength
C:-creep strength
D:-creep rupture strength
Ans: C
4. When the addenda of pinion and wheel is such that the path of approach and path of recess are half of their maximum possible values then the length of path of contact is given by,
r pitch circle radius of pinion
R pitch circle radius of wheel
`Phi` pressure angle
A:-`((R+r) sinPhi)/(2)`
B:-`((R+r) cosPhi)/(2)`
C:-`((R+r) tanPhi)/(2)`
D:-`((R+r))/(2sinPhi```` ```
Ans: A
5. In a clock mechanism, the gear train used to connect minute hand to hour hand is
A:-Epicyclic gear train
B:-Reverted gear train
C:-Compound gear train
D:-Simple gear train
Ans: B
6. The angle between the direction of follower motion and a normal to pitch curve is called
A:-Pitch angle
B:-Prime angle
C:-Base angle
D:-Pressure angle
Ans: D
7. The ratio of height of Porter Governor (When length of arms and links are equal) to the height of Watt's Governor is m-mass of ball and M-mass of the load on sleeve.
A:-`(m)/(m+M)`
B:-`(M)/(m+M)`
C:-`(m+M)/(m)`
D:-`(m+M)/(M)`
Ans: C
8. To restore stable operating condition in a hydrodynamic journal bearing, when it encounters higher magnitude loads
A:-Oil viscosity is to be decreased
B:-Oil viscosity is to be increased
C:-Oil viscosity index is to be increased
D:-Oil viscosity index is to be decreased
Ans: B
9. A flywheel of moment of inertia 9-8 Kg`m^(2)` fluctuates by 30 rpm for a fluctuation of energy of 19360 J. The mean speed of the flywheel is in rpm
A:-600
B:-900
C:-968
D:-2940
Ans: A
10. The number of elastic constants for a completely anisotropic elastic material are
A:-3
B:-4
C:-21
D:-25
Ans: C
11. Angle on which strength of the tool depends is
A:-lip angle
B:-rake angle
C:-cutting angle
D:-clearance angle
Ans: B
12. Drilling can be termed as
A:-Oblique cutting
B:-Simple cutting
C:-Orthogonal cutting
D:-Uniform cutting
Ans: A
13. In APT language, the cutter motion in incremental cordinate mode is addressed as
A:-GO TO/...
B:-GO/TO...
C:-GO DL TA/...
D:-GO FWD/...
Ans: B
14. The critical depth of a rectangular channel of width 4 m and discharge of `12m^(3)`/sec is equal to
A:-0.972 mm
B:-300 mm
C:-30 mm
D:-674 mm
Ans: A
15. Flow can be considered as incompressible flow
A:-When mach number less than 0.3
B:-When mach number in between 0.3 and 1
C:-When mach number greater than 1
D:-When mach number equal to 1
Ans: A
16. In a doublet equipotential lines are
A:-Circles tangent to y-axis
B:-Circles tangent to x-axis
C:-Concentric circles with centre on y-axis
D:-Concentric circle with centre on x-axis
Ans: A
17. What is the value of momentum correction factor for a turbulant flow in a pipe ?
A:-greater than 1
B:-1.02-1.05
C:-1.33
D:-2.00
Ans: B
18. When maximum power is transmitted through the pipe, the relation between Total Head Supplied (H) and Head loss due to friction `(H_(L))` is
A:-`H_(L)` = `H//2`
B:-`H_(L)` = `H//4`
C:-`H_(L)` = `H//3`
D:-`H_(L)`= H
Ans: C
19. What will be the number of buckets on the periphery of Pelton Wheel Runner, If 'D' is the diameter of wheel and 'd' is the diameter of the jet ?
A:-`D//2d` + 10
B:-`(D)/(2d)` +12
C:-`(D)/(2d)`+14
D:-`(D)/(2d)`+15
Ans: D
20. What is the maximum efficiency of a jet striking a single plate moving in the direction of jet is
A:-`(4)/(27)`
B:-`(6)/(27)`
C:-`(1)/(2)`
D:-`8//27`
Ans: D
21. For Francis Turbine Thoma's critical cavitation factor `sigma_(C)` can be related to specific speed as
A:-0.30 + 0.0036 `((N_S)/(100))^(2.73)`
B:-0.30 + 0.0036 `((N_S)/(100))`
C:-0.0431 `((N_S)/(100))^(2)`
D:-0.0431`(N_S//100)`
Ans: C
22. What is the least diameter of impeller in a centrifugal pump to commense the flow, where Hm is the manometric head N is the speed of impeller ?
A:-`(97.7Hm)/(N)`
B:-`(97.7Hm)/(sqrt(N))`
C:-`(97.7sqrt(Hm))/(N)`
D:-`(97.7sqrt(N))/(Hm)`
Ans: C
23. When an air vessel is fitted in a double acting Reciprocating pump, percentage workdoneper stroke saved against friction is
A:-84.8%
B:-39.2%
C:-46.4%
D:-76.4%
Ans: B
24. Q `->` Discharge from supply tank to valve box
q `->` Discharge from valve box to delivery tank
H `->` Height of water in discharge tank above valve box
h `->` Height of water in supply tank above valve box
Then D' Aubuisson's efficiency of a hydraulic Ram is
A:-`(Qh)/(qH)`
B:-`(Qq)/(Hh)`
C:-`(qH)/((Q-q)h)`
D:-`(qH)/(Qh)`
Ans: D
25. The octane number of following fuel is 100 : (A) N heptane (B) butane (C) cetane (D) iso octane
Ans: D
26. The reversible engine has thermal efficiency of 20%. What will be the COP if it is used as a refrigerator with other conditions unchanged : (A) 2 (B) 3.33 (C) 4 (D) 4.5
Ans: C
27. The property which is valid for prediction but not valid for forecasting is : (A) Subjective (B) Reproducible (C) Scientific (D) None of the above
Ans: A
28. The component which is not always in contact with fly wheel is : (A) crank shaft (B) friction plate (C) pressure plate (D) clutch cover
Ans: B
29. Draft tube is not mandatory for the following turbine : (A) Francis turbine (B) Pelton turbine (C) Keplan turbine (D) Deraiz turbine
Ans: B
30. The wet bulb depression decreases as : (A) Humidity increases (B) Humidity decreases (C) Temperature become 0C (D) None of the above
Ans: A
31. The method of forecasting which is used when past data is not available is : (A) Delphi method (B) Trend line technique (C) Historical analogy (D) None of these
Ans: A
32. When the water level falls below the safe limit the following device will extinguish the fire in the furnace of the boiler? (A) fusible plug (B) safety valve (C) blow off cock (D) feed check valve
Ans: A
33. The ability of the material to withstand shock is called : (A) ductility (B) toughness (C) hardness (D) fatigue strength
Ans: B
34. The following alloying element will increase the corrosion resistance of steel : (A) Titanium (B) Nickel (C) Chromium (D) Manganese
Ans: C
35. The part used to support the core in mould is called : (A) Chaplet (B) Slick (C) Lifter (D) Binder
Ans: A
36. The angle at the point of drill bit is : (A) 102 (B) 118 (C) 130 (D) 135
Ans: B
37. The process of embossing the diamond shaped pattern on work piece is called : (A) chamfering (B) parting (C) facing (D) knurling
Ans: D
38. The process of reducing activity time by adding resources resulting in the increase of cost is called : (A) reducing (B) updating (C) optimising (D) crashing
Ans: D
39. The PERT has an optimistic time of 4 days pessimistic time of 16 days and expected time of 10 days. The likely time of activity is : (A) 14 (B) 12 (C) 10 (D) 8
Ans: C
40. In cam shaft drive mechanism camshaft rotates in the reverse direction of the crankshaft in
(A) gear drive (B) chain drive (C) belt drive (D) gear drive with idler gear
Ans: A
41. In a 4 stroke diesel engine the number of teeth of the camshaft sprocket is _____ the number of teeth of sprocket on crankshaft.
(A) same (B) double (C) half (D) none of these
Ans: B
42. The maximum wear of the bore occurred at
(A) top non-thrust side (B) top thrust side (C) bottom non-thrust side (D) bottom thrust side
Ans: B
43. At the end of combustion the temperature inside cylinder will reach approximately
(A) 400° C (B) 800° C (C) 2200° C (D) 100° C
Ans: C
44. In automobile engines the water pump used in cooling system is
(A) gear type (B) centrifugal type (C) plunger type (D) vane type
Ans: B
45. The _____ helps to bring the cold engine to working temperature quickly.
(A) thermostat (B) cooling fins (C) radiator (D) water pump
Ans: A
46. In higher altitude, the water boils at
(A) 100° C (B) below 100° C (C) above 100° C (D) 4° C
Ans: B
47. Oil pumps are driven by
(A) electricity (B) crank-shaft (C) cam-shaft (D) vacuum
Ans: C
48. To limit the max pressure of the oil in lubrication system
(A) pump stops when limit reached (B) relay provided to disconnect pump
(C) a pressure relief valve provided (D) none of these
Ans: C
49. In muffler assembly catalytic converter is provided to
(A) increase power (B) reduce noise (C) reduce pollution (D) none of these
Ans: C
50. Drive of the mechanical fuel pump is getting from _____
(A) crank-shaft (B) cam-shaft (C) connecting rod (D) timing gear
Ans: B
51. Drive of the high pressure pump in CRDI diesel engine is getting from
(A) crank-shaft (B) cam-shaft (C) flywheel (D) timing gear
Ans: A
52. The lubricating oil is diluted by
(A) water (B) fuel (C) dust (D) mixing of other particles
Ans: B
53. Oil cooler is provided in engine for
(A) cooling system (B) scavenging (C) crank case ventilation (D) cooling lubricating oil
Ans: D
54. In Modern vehicles the lubrication system commonly used are
(A) gravity feed (B) splash system (C) drip type (D) pressure lubricating type
Ans: D
55. The part which make the boiling point of engine increased
(A) water jacket (B) radiator (C) pressure cap (D) thermostat valve
Ans: C
56. A thermostat valve is opened
(A) almost 80° C (B) almost 100° C (C) 0° C (D) almost 4° C
Ans: A
57. Bleeding of fuel system means removing _____ from the system.
(A) water (B) dust (C) fuel (D) air
Ans: D
58. In two stage filter system, the material used as secondary filter is
(A) wire mesh (B) cloth (C) paper (D) nylon
Ans: C
59. The timing and quantity of the fuel sprayed is controlled by
(A) rotating plunger (B) rotating barrel (C) the governor (D) priming pump
Ans: A
60. The process of testing the pump for the accuracy of their supplying fuel at correct intervals is
(A) calibration (B) phasing (C) priming (D) governing
Ans: B
61. The _____ is a device for holding any speed steady between idling and maximum speed.
(A) injector (B) throttle pedal (C) governor (D) feed pump
Ans: C
62. The process of driving exhaust gas out of the cylinder and replacing it with fresh air is called
(A) exhaust stroke (B) scavenging (C) charging (D) injection
Ans: B
63. In CRDI engines, high pressure diesel pump develops the pressure up to
(A) 400 bar (B) 700 bar (C) 1600 bar (D) 40 bar
Ans: C
64. Radiator fan motor on at below
(A) 98° C (B) 93° C (C) 82° C (D) 76° C
Ans: A
65. Emissions from a diesel automobile is coming from
(A) the fuel tank (B) the crankcase (C) the exhaust (D) all the above
Ans: D
66. In compression ignition engines the particulates are caused by
(A) lack of turbulence (B) lack of oxygen (C) burning of lubricating oil (D) all of these
Ans: D
67. Lubrication and operation of fuel system components are done by natural lubricating properties of diesel fuel. It is improved by
(A) lead (B) sulphur (C) nitrogen (D) hydrocarbons
Ans: B
68. To reduce NOx (or nitrogen oxide) emissions that contribute to air pollution _____ is provided.
(A) PCV valve (B) EGR valve (C) DPF (D) EVAP
Ans: B
69. The _____ nozzle having an auxiliary spray hole for easy starting under cold condition.
(A) pintle type (B) delay type (C) multihole type (D) pintaux type
Ans: D
70. The number of diodes used in an alternator is
(A) one (B) two (C) three (D) six
Ans: D
71. Which part in an alternator protect battery from discharging ?
(A) regulator (B) rectifier diode (C) slip ring (D) rotor
Ans: B
72. The engine crankshaft must be rotated at a speed of minimum _____ r.p.m to start the engine.
(A) 100 (B) 400 (C) 1200 (D) 3000
Ans: A
73. A typical ratio between the flywheel ring gear and the starter pinion is
(A) 100 : 1 (B) 10 : 1 (C) 15 : 1 (D) 25 : 1
Ans: C
74. Specific gravity of the fully charged lead acid battery is
(A) 1.00 (B) 1.11 (C) 1.20 (D) 1.28
Ans: D
75. The oxygen sensor is fitted in
(A) inlet manifold (B) air cleaner (C) exhaust system (D) cylinder block
Ans: C
76. Heater plug is fitted in
(A) inlet manifold (B) combustion chamber (C) fuel feed pump (D) air cleaner
Ans: B
77. The turbo charger is rotated by
(A) exhaust gas (B) belt from crank-shaft (C) cam-shaft gear (D) electric motor
Ans: A
78. If in an engine complete combustion occurs, it produced
(A) carbon monoxide (B) carbon dioxide (C) nitrogen oxide (D) oxygen
Ans: B
79. When the Bharat Stage III implemented Nation wide ?
(A) 2000 (B) 2005 (C) 2001 (D) 2010
Ans: D
80. In these type of clutches there is no possibility for slip :
(A) cone clutch (B) diaphragm clutch (C) dog clutch (D) fluid coupling
Ans: C
81. _____ is distribute output torque to both side wheels uniformly.
(A) Rear axle (B) Final drive (C) Differential (D) Propeller shaft
Ans: C
82. Fluid coupling is used along with the
(A) sliding mesh gear box (B) constant mesh gear box (C) synchromesh gear box (D) Automatic gear box
Ans: D
83. Free clutch pedal play in a car is
(A) 30 mm (B) 60 mm (C) 100 mm (D) 3 mm
Ans: A
84. Spur gear is used in _____ gear box.
(A) sliding mesh (B) constant mesh (C) synchromesh (D) automatic
Ans: A
85. In universal joint the bearing fitted in cross and spider is
(A) bush (B) needle roller bearing (C) tapered roller bearing (D) ball bearing
Ans: B
86. In fully floating axle, the axle shaft takes
(A) vehicle load (B) side thrust (C) driving thrust (D) all of these
Ans: C
87. In which type of axle, the drive axle can be replaced easily, without jack up the vehicle ?
(A) three quarter type axle (B) semi-floating axle (C) fully floating axle (D) dead axle
Ans: C
88. The distance between front and rear wheel centre is
(A) wheel track (B) overhang (C) wheel base (D) toe in
Ans: C
89. The angle between the vertical line from the centre point of tyre and the central line of the tyre is
(A) camber (B) castor (C) king pin inclination (D) toe in
Ans: A
90. To increase directional stability vehicles are provided
(A) camber (B) castor (C) king pin inclination (D) toe in
Ans: B
91. _____ is connected cross shaft with drag link.
(A) Stub axle spindle (B) Track rod (C) Drop arm (D) Steering arm
Ans: C
92. By adjusting on track rod, _____ can be adjusted.
(A) camber (B) castor (C) king pin inclination (D) toe in-toe out
Ans: D
93. The weight of the components between suspension and the tyre including tyre is called
(A) sprung weight (B) unsprung weight (C) gross vehicle weight (D) none of these
Ans: B
94. The stabilizer bar is fitted on vehicles to avoid
(A) roll (B) dip (C) pitch (D) turn
Ans: A
95. _______ wheels cannot be used in modern vehicles with tubeless tyre
(A) Disc wheel (B) Alloy wheel (C) Wire wheel (D) Composit wheel
Ans: C
96. Tyre wear more from centre which indicate
(A) tyre is under inflated (B) tyre is over inflated (C) camber angle more (D) camber angle less
Ans: B
97. On a Tyre 195/55 R 16 87 V is marked in this, what it is indicated by the number 55 ?
(A) Section width (B) Rim size (C) Aspect ratio (D) Load carrying capacity
Ans: C
98. Steering wheel vibration is mainly due to
(A) unbalanced front tyre (B) incorrect castor (C) incorrect camber (D) toe out
Ans: A
99. On which principle hydraulic brakes are working ?
(A) Ohm’slaw (B) Boyle’s law (C) Charle’s law (D) Pascal’s law
Ans: D
100. In disc brakes self adjustment is done by
(A) calliper (B) piston (C) piston seal (D) calliper pin
Ans: C
(A) crank-shaft (B) cam-shaft (C) flywheel (D) timing gear
Ans: A
52. The lubricating oil is diluted by
(A) water (B) fuel (C) dust (D) mixing of other particles
Ans: B
53. Oil cooler is provided in engine for
(A) cooling system (B) scavenging (C) crank case ventilation (D) cooling lubricating oil
Ans: D
54. In Modern vehicles the lubrication system commonly used are
(A) gravity feed (B) splash system (C) drip type (D) pressure lubricating type
Ans: D
55. The part which make the boiling point of engine increased
(A) water jacket (B) radiator (C) pressure cap (D) thermostat valve
Ans: C
56. A thermostat valve is opened
(A) almost 80° C (B) almost 100° C (C) 0° C (D) almost 4° C
Ans: A
57. Bleeding of fuel system means removing _____ from the system.
(A) water (B) dust (C) fuel (D) air
Ans: D
58. In two stage filter system, the material used as secondary filter is
(A) wire mesh (B) cloth (C) paper (D) nylon
Ans: C
59. The timing and quantity of the fuel sprayed is controlled by
(A) rotating plunger (B) rotating barrel (C) the governor (D) priming pump
Ans: A
60. The process of testing the pump for the accuracy of their supplying fuel at correct intervals is
(A) calibration (B) phasing (C) priming (D) governing
Ans: B
61. The _____ is a device for holding any speed steady between idling and maximum speed.
(A) injector (B) throttle pedal (C) governor (D) feed pump
Ans: C
62. The process of driving exhaust gas out of the cylinder and replacing it with fresh air is called
(A) exhaust stroke (B) scavenging (C) charging (D) injection
Ans: B
63. In CRDI engines, high pressure diesel pump develops the pressure up to
(A) 400 bar (B) 700 bar (C) 1600 bar (D) 40 bar
Ans: C
64. Radiator fan motor on at below
(A) 98° C (B) 93° C (C) 82° C (D) 76° C
Ans: A
65. Emissions from a diesel automobile is coming from
(A) the fuel tank (B) the crankcase (C) the exhaust (D) all the above
Ans: D
66. In compression ignition engines the particulates are caused by
(A) lack of turbulence (B) lack of oxygen (C) burning of lubricating oil (D) all of these
Ans: D
67. Lubrication and operation of fuel system components are done by natural lubricating properties of diesel fuel. It is improved by
(A) lead (B) sulphur (C) nitrogen (D) hydrocarbons
Ans: B
68. To reduce NOx (or nitrogen oxide) emissions that contribute to air pollution _____ is provided.
(A) PCV valve (B) EGR valve (C) DPF (D) EVAP
Ans: B
69. The _____ nozzle having an auxiliary spray hole for easy starting under cold condition.
(A) pintle type (B) delay type (C) multihole type (D) pintaux type
Ans: D
70. The number of diodes used in an alternator is
(A) one (B) two (C) three (D) six
Ans: D
71. Which part in an alternator protect battery from discharging ?
(A) regulator (B) rectifier diode (C) slip ring (D) rotor
Ans: B
72. The engine crankshaft must be rotated at a speed of minimum _____ r.p.m to start the engine.
(A) 100 (B) 400 (C) 1200 (D) 3000
Ans: A
73. A typical ratio between the flywheel ring gear and the starter pinion is
(A) 100 : 1 (B) 10 : 1 (C) 15 : 1 (D) 25 : 1
Ans: C
74. Specific gravity of the fully charged lead acid battery is
(A) 1.00 (B) 1.11 (C) 1.20 (D) 1.28
Ans: D
75. The oxygen sensor is fitted in
(A) inlet manifold (B) air cleaner (C) exhaust system (D) cylinder block
Ans: C
76. Heater plug is fitted in
(A) inlet manifold (B) combustion chamber (C) fuel feed pump (D) air cleaner
Ans: B
77. The turbo charger is rotated by
(A) exhaust gas (B) belt from crank-shaft (C) cam-shaft gear (D) electric motor
Ans: A
78. If in an engine complete combustion occurs, it produced
(A) carbon monoxide (B) carbon dioxide (C) nitrogen oxide (D) oxygen
Ans: B
79. When the Bharat Stage III implemented Nation wide ?
(A) 2000 (B) 2005 (C) 2001 (D) 2010
Ans: D
80. In these type of clutches there is no possibility for slip :
(A) cone clutch (B) diaphragm clutch (C) dog clutch (D) fluid coupling
Ans: C
81. _____ is distribute output torque to both side wheels uniformly.
(A) Rear axle (B) Final drive (C) Differential (D) Propeller shaft
Ans: C
82. Fluid coupling is used along with the
(A) sliding mesh gear box (B) constant mesh gear box (C) synchromesh gear box (D) Automatic gear box
Ans: D
83. Free clutch pedal play in a car is
(A) 30 mm (B) 60 mm (C) 100 mm (D) 3 mm
Ans: A
84. Spur gear is used in _____ gear box.
(A) sliding mesh (B) constant mesh (C) synchromesh (D) automatic
Ans: A
85. In universal joint the bearing fitted in cross and spider is
(A) bush (B) needle roller bearing (C) tapered roller bearing (D) ball bearing
Ans: B
86. In fully floating axle, the axle shaft takes
(A) vehicle load (B) side thrust (C) driving thrust (D) all of these
Ans: C
87. In which type of axle, the drive axle can be replaced easily, without jack up the vehicle ?
(A) three quarter type axle (B) semi-floating axle (C) fully floating axle (D) dead axle
Ans: C
88. The distance between front and rear wheel centre is
(A) wheel track (B) overhang (C) wheel base (D) toe in
Ans: C
89. The angle between the vertical line from the centre point of tyre and the central line of the tyre is
(A) camber (B) castor (C) king pin inclination (D) toe in
Ans: A
90. To increase directional stability vehicles are provided
(A) camber (B) castor (C) king pin inclination (D) toe in
Ans: B
91. _____ is connected cross shaft with drag link.
(A) Stub axle spindle (B) Track rod (C) Drop arm (D) Steering arm
Ans: C
92. By adjusting on track rod, _____ can be adjusted.
(A) camber (B) castor (C) king pin inclination (D) toe in-toe out
Ans: D
93. The weight of the components between suspension and the tyre including tyre is called
(A) sprung weight (B) unsprung weight (C) gross vehicle weight (D) none of these
Ans: B
94. The stabilizer bar is fitted on vehicles to avoid
(A) roll (B) dip (C) pitch (D) turn
Ans: A
95. _______ wheels cannot be used in modern vehicles with tubeless tyre
(A) Disc wheel (B) Alloy wheel (C) Wire wheel (D) Composit wheel
Ans: C
96. Tyre wear more from centre which indicate
(A) tyre is under inflated (B) tyre is over inflated (C) camber angle more (D) camber angle less
Ans: B
97. On a Tyre 195/55 R 16 87 V is marked in this, what it is indicated by the number 55 ?
(A) Section width (B) Rim size (C) Aspect ratio (D) Load carrying capacity
Ans: C
98. Steering wheel vibration is mainly due to
(A) unbalanced front tyre (B) incorrect castor (C) incorrect camber (D) toe out
Ans: A
99. On which principle hydraulic brakes are working ?
(A) Ohm’slaw (B) Boyle’s law (C) Charle’s law (D) Pascal’s law
Ans: D
100. In disc brakes self adjustment is done by
(A) calliper (B) piston (C) piston seal (D) calliper pin
Ans: C
· UPSC Exam Syllabus- Mechanical Engineering
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