McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 51. |
The size of the engine intake valve is |
| A. | Same as that of exhaust valve |
| B. | Depends upon the temperature of ambient air. |
| C. | Does not depends upon the size of the exhaust valve |
| D. | Smaller than that of exhaust valve |
| E. | Large than that of exhaust valve |
| Answer» D. Smaller than that of exhaust valve | |
| 52. |
To avoid chances of maisalignment the bearing generally used is |
| A. | Double row ball bearing |
| B. | Axial bearing |
| C. | Self-aligning bearing |
| D. | Taper roller bearing |
| E. | Radial bearing |
| Answer» D. Taper roller bearing | |
| 53. |
In the cam the distance between the base circle and the nose is called |
| A. | Displacement |
| B. | Lift |
| C. | Flank |
| D. | Lobe |
| E. | Nose |
| Answer» B. Lift | |
| 54. |
Which one of the following does not form a part of the fuel supply system for a Diesel engine? |
| A. | Injector |
| B. | Filter |
| C. | Spray nozzles |
| D. | Supply pump |
| E. | Air cleaner |
| Answer» E. Air cleaner | |
| 55. |
In case of four cylinder opposed cylinder engines, the firing order is |
| A. | 1-2-4-3 |
| B. | 1-2-3-4 |
| C. | 1-4-3-2 |
| D. | 1-2-4-2 |
| E. | 1-3-2-4 |
| Answer» C. 1-4-3-2 | |
| 56. |
Magneto ignition system is used in |
| A. | S.I. engines |
| B. | C.I. engines |
| C. | Steam engines |
| D. | none of the above |
| E. | None of the above |
| Answer» A. S.I. engines | |
| 57. |
Cross wire grooves on tyres |
| A. | Absorb shocks due to road unevenness |
| B. | Lessen the danger of skidding |
| C. | Provide good traction |
| D. | Provide better load carrying capacity |
| E. | Secure better steering properties |
| Answer» A. Absorb shocks due to road unevenness | |
| 58. |
Automobiles in India generally do not use battery with a voltage of |
| A. | 6 volts |
| B. | 12 volts |
| C. | 18 volts |
| D. | 24 volts |
| E. | Any of the above |
| Answer» C. 18 volts | |
| 59. |
Loss of engine compression can result from |
| A. | Defective fan delt |
| B. | Loose valve and tapper clearance |
| C. | Poor lubrication |
| D. | Worn rings or cylinder wall |
| E. | Any of the above |
| Answer» D. Worn rings or cylinder wall | |
| 60. |
Which vechicle is generally provided with four wheel drive |
| A. | Standard wagon |
| B. | Ambassador car |
| C. | Jeep |
| D. | Padmini car |
| E. | Metador |
| Answer» C. Jeep | |
| 61. |
Which air cleaner is considered to be most effective in Diesel engines? |
| A. | All are equally effective |
| B. | Whirl type |
| C. | Oil bath type |
| D. | Wet type |
| E. | Dry type |
| Answer» C. Oil bath type | |
| 62. |
The starter motor is driven by |
| A. | V-belt drive |
| B. | P.I.V drive |
| C. | Chain drive |
| D. | Flat belt drive |
| E. | Gear drive |
| Answer» E. Gear drive | |
| 63. |
Which region of an automobile tyre is subjected to greatest flexing action? |
| A. | Bead |
| B. | Side wall |
| C. | Shoulder |
| D. | Tread |
| E. | None of the above |
| Answer» B. Side wall | |
| 64. |
The time before actual fuel injection and pump olunger starts to pump fuel, is known as |
| A. | injection lag |
| B. | overlap |
| C. | ignition lag |
| D. | none of the above |
| E. | None of the above |
| Answer» A. injection lag | |
| 65. |
The inlet value of a four stroke I.C. engine, in actual practice, should close |
| A. | exactly at the end of suction stroke |
| B. | slightly after the end of suction stroke |
| C. | slightly before the end of suction stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» B. slightly after the end of suction stroke | |
| 66. |
Ignition system used in scooters is |
| A. | magneto system |
| B. | battery system |
| C. | Combination of magneto and battery system |
| D. | neither magneto nor battery system |
| E. | None of the above |
| Answer» A. magneto system | |
| 67. |
In a petrol engine, the gas which does not burn and passes out without transformation is |
| A. | Oxygen |
| B. | Carbondioxide |
| C. | Nitrogen |
| D. | Carbon monoxide |
| E. | Water vapour |
| Answer» C. Nitrogen | |
| 68. |
In case of clutch if the springs become weak, the remedy lies in |
| A. | Tightening further the springs |
| B. | Interchanging the springs |
| C. | Retempering the springs |
| D. | Replacing the springs |
| E. | Any of the above |
| Answer» D. Replacing the springs | |
| 69. |
If the water level in engine is maintained low, the likely consequence could be |
| A. | Piston seizure |
| B. | Engine knocking |
| C. | Bearing deterioration |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 70. |
At the first sight a petrol engine is identified by |
| A. | Size of air cleaner |
| B. | Cylinder size |
| C. | Spark plug |
| D. | Power output |
| E. | Operating speed |
| Answer» C. Spark plug | |
| 71. |
Aluminium cylinder blocks require |
| A. | No lines |
| B. | Brass liners |
| C. | Stainless steel liners |
| D. | Cast iron liners |
| E. | Aluminium liners |
| Answer» D. Cast iron liners | |
| 72. |
1000 mm diameter tyre is generally used on |
| A. | Scooters |
| B. | Jeeps |
| C. | Motorcycles |
| D. | Trucks |
| E. | Mopads |
| Answer» D. Trucks | |
| 73. |
Engine starter motor is |
| A. | D.C. compound motor |
| B. | D.C. series motor |
| C. | Synchronous motor |
| D. | Single phase A.C. motor |
| E. | D.C. shunt motor |
| Answer» B. D.C. series motor | |
| 74. |
Which one of the followings is used in C.I. engines? |
| A. | spark plug |
| B. | injector |
| C. | cross-head |
| D. | none of the above |
| E. | None of the above |
| Answer» B. injector | |
| 75. |
Failure of an engine to start even though it turns over at normal cranking speed could be due to |
| A. | A defective cranking motor |
| B. | Defective ignition |
| C. | Run down battery |
| D. | Sticking valve |
| E. | Low ambient temperature |
| Answer» B. Defective ignition | |
| 76. |
The substance which when added in a small proportion into petrol reduces knocking is |
| A. | iso-butane |
| B. | n-heptane |
| C. | methyl nepthalene |
| D. | tetra ethyl lead |
| E. | None of the above |
| Answer» D. tetra ethyl lead | |
| 77. |
In a diesel engine the pipe carrying fuel from fuel pump to nozzle is made of |
| A. | Plastic |
| B. | Aluminium |
| C. | P.V.C. |
| D. | Steel |
| E. | Copper |
| Answer» D. Steel | |
| 78. |
The percentage of heat released from fuel air mixutre, in an internal combustion engine which is converted into useful work is roughly |
| A. | 60 - 64 percent |
| B. | 20 - 25 percent |
| C. | 35 - 45 percent |
| D. | 10 percent |
| E. | 15 - 20 percent |
| Answer» B. 20 - 25 percent | |
| 79. |
The knocking C.I engines is characterised by the sudden auto-ignition of the mixture |
| A. | at the end of the combustion process |
| B. | in the middle of combustion process |
| C. | at the very beginning of the combustion process |
| D. | none of the above |
| E. | None of the above |
| Answer» C. at the very beginning of the combustion process | |
| 80. |
The braking system provided on trains is |
| A. | Pneumatic |
| B. | Vaccum |
| C. | Hydraulic |
| D. | Mechanical |
| E. | Air assisted hydraulic |
| Answer» B. Vaccum | |
| 81. |
The need for installing new piston rings is determined by checking |
| A. | The gap between the ends of the ring |
| B. | The clearance between cylinder and piston rings |
| C. | The clearance between piston and piston rings |
| D. | The clearance between cylinder and piston |
| E. | The surface of the piston ring |
| Answer» B. The clearance between cylinder and piston rings | |
| 82. |
In a Diesel engine, during combustion the pressure may increase at a range of |
| A. | 55-75 atm |
| B. | 10-15 atm |
| C. | 20-30 atm |
| D. | 15-20 atm |
| E. | Depends on engine size and speed |
| Answer» A. 55-75 atm | |
| 83. |
A smoky blue exhaust is due to |
| A. | Burning of oil in combustion chamber |
| B. | Incorrect valve adjustment |
| C. | Excessive air |
| D. | Incorrect tappet adjustment |
| E. | Excessive rich mixture |
| Answer» A. Burning of oil in combustion chamber | |
| 84. |
Differential gear box oil is usually renewed after |
| A. | 1000 km |
| B. | 2500 - 6000 km |
| C. | 10000 - 20000 km |
| D. | 2500 km |
| E. | 6000 km |
| Answer» B. 2500 - 6000 km | |
| 85. |
The tendency of a petrol engine to knock increases by |
| A. | Turbo-charging |
| B. | Cataytic converter |
| C. | Alcohol |
| D. | Addition of lead |
| E. | Super-charging |
| Answer» A. Turbo-charging | |
| 86. |
In S.I. engine if the spark plug deposit indicates black coating of soot, it therefore indicates that the engine has been generally operating on |
| A. | Too rich mixture |
| B. | Most economical mixture |
| C. | Too lean mixture |
| D. | Slightly rich mixture |
| E. | Stoichiometric mixture |
| Answer» A. Too rich mixture | |
| 87. |
Ignition quality of petrol is expressed by |
| A. | Calorific value |
| B. | Octane no |
| C. | Cetane no |
| D. | Mass/volume ratio |
| E. | Alcohol |
| Answer» B. Octane no | |
| 88. |
Petrol engines are also known as |
| A. | S.I. Engines |
| B. | C.I. Engines |
| C. | Steam Engines |
| D. | none of the above |
| E. | None of the above |
| Answer» A. S.I. Engines | |
| 89. |
The air gap between the central electrode and ground electrode of a spark plug is approximately |
| A. | 1 cm |
| B. | 0.5 cm |
| C. | 0.2 cm |
| D. | 0.1 cm to 0.06 cm |
| E. | None of the above |
| Answer» D. 0.1 cm to 0.06 cm | |
| 90. |
In commercial vehicle layouts engine is located forward, rear or under floor mainly to |
| A. | Minimize the tendency to over turn |
| B. | Reduce the weight of chassis |
| C. | Increase fuel economy |
| D. | Better utilise the space |
| E. | Have better weight distribution |
| Answer» E. Have better weight distribution | |
| 91. |
When considerable material must be removed to clean up a cylinder bore, the cylinder should be |
| A. | Glazed |
| B. | Ground |
| C. | Honed |
| D. | Reamed |
| E. | Bored |
| Answer» D. Reamed | |
| 92. |
Wheel base of a vehicle is the |
| A. | Distance between the front tyres |
| B. | Distance between front and rear axles |
| C. | Extreme length of the vehicle |
| D. | The combined width of rear tyres |
| E. | Width of tyres |
| Answer» B. Distance between front and rear axles | |
| 93. |
In a vehicle the probable cause for hard steering could be |
| A. | Low tyre pressure |
| B. | Bent wheel spindle |
| C. | Tie rod ends tight |
| D. | Excessive castor |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 94. |
An opposed cylinder engine has |
| A. | One crankshaft and two camshafts |
| B. | One crankshaft and one camshafts |
| C. | Two crankshafts and two camshafts |
| D. | Two crankshafts and four camshafts |
| E. | Two crankshafts and one camshaft |
| Answer» C. Two crankshafts and two camshafts | |
| 95. |
For car speed upto 100 kmph the mean deceleration in m/s2 taken as |
| A. | 4.5 |
| B. | 3.5 |
| C. | 2.5 |
| D. | 1.5 |
| E. | 5 |
| Answer» C. 2.5 | |
| 96. |
Which motor cycle has maximum power rating? |
| A. | Rajdoot |
| B. | Yezdi |
| C. | Jawa |
| D. | Yamaha |
| E. | Bullet |
| Answer» D. Yamaha | |
| 97. |
Two speed reverse gear arrangement is generally provided in case of |
| A. | Standard wagon |
| B. | Jeep |
| C. | Ambassador car |
| D. | Metador |
| E. | Tractors |
| Answer» E. Tractors | |
| 98. |
Worn out carburettor jets are likely to cause |
| A. | More noise |
| B. | Excess fuel consumption |
| C. | Knocking |
| D. | Engine warm up |
| E. | Excess engine output |
| Answer» B. Excess fuel consumption | |
| 99. |
The firing order in the case of a four-cylinder I.C. engine (inline) is given as |
| A. | 1-2-3-4 |
| B. | 1-4-3-2 |
| C. | 1-2-4-3 |
| D. | none of the above |
| E. | None of the above |
| Answer» C. 1-2-4-3 | |
| Explanation: The firing order for a four-cylinder internal combustion engine is typically 1-2-4-3, where the cylinders are numbered from the front of the engine to the back. This firing order is commonly used in many four-cylinder engines because it provides smooth and even power delivery, as each cylinder fires in a balanced sequence. | |
| 100. |
Most of the mopeds in India have capacity of |
| A. | 50 c.c. |
| B. | 250 c.c. |
| C. | 10 c.c. |
| D. | 150 c.c. |
| E. | 174 c.c. |
| Answer» A. 50 c.c. | |
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