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MCQOPTIONS
This section includes 315 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
If the oil level in the oil pan of the engine is maintained above the gauge mark, the likely damage it may cause is |
| A. | Engine fuming |
| B. | Carbon deposits |
| C. | Blue colour in exhaust |
| D. | All of the above |
| E. | None of the above |
| Answer» E. None of the above | |
| 52. |
Boiling range of kerosene is |
| A. | 50 to 100?C |
| B. | 100 to 150?C |
| C. | 150 to 300?C |
| D. | 350 to 500?C |
| E. | None of the above |
| Answer» D. 350 to 500?C | |
| 53. |
The most widely used brakes are operted |
| A. | Electrically |
| B. | Hydraulically |
| C. | By vacuum |
| D. | Combination of (A) and (C) |
| E. | Mechanical |
| Answer» C. By vacuum | |
| 54. |
In a S.I. engine high air velocity through air hom may be of the order of |
| A. | 100 m/s |
| B. | 10 m/s |
| C. | 1 m/s |
| D. | 5 m/s |
| E. | 50 m/s |
| Answer» B. 10 m/s | |
| 55. |
Cetane number of Diesel oil normally available in market is in the range. |
| A. | 75 -- 80 |
| B. | 60 -- 65 |
| C. | 90 -- 105 |
| D. | 90 -- 100 |
| E. | 45 -- 50 |
| Answer» F. | |
| 56. |
Efficiency of an IC engine is normally of the order of |
| A. | 30-35% |
| B. | 50-60% |
| C. | 10-15% |
| D. | 80-90% |
| E. | Alcohol |
| Answer» B. 50-60% | |
| 57. |
In a four stroke SI engine the inlet valve opens |
| A. | at TDC and closes at BDC |
| B. | 10? before TDC and closes 10? after BDC |
| C. | 10? before TDC and closes 10? after BDC |
| D. | 10? before TDC and closes 50? after BDC |
| E. | None of the above |
| Answer» E. None of the above | |
| 58. |
Quality of diesel oil can be expressed in terms of cetane number and also |
| A. | aniline point |
| B. | API gravity |
| C. | SAE number |
| D. | diesel index |
| E. | None of the above |
| Answer» C. SAE number | |
| 59. |
Cetane number of a Diesel fuel is measure of |
| A. | Ignition quality |
| B. | Viscosity |
| C. | Volatility |
| D. | Delay period |
| E. | A.P.I. specific gravity |
| Answer» E. A.P.I. specific gravity | |
| 60. |
The ignition coil acts as |
| A. | A capacitor |
| B. | An inductor |
| C. | A RC circuit |
| D. | A step up transformer |
| E. | A step down transformer |
| Answer» E. A step down transformer | |
| 61. |
If a spark plug does not fire, the probable cause could be |
| A. | Cracked porcelain |
| B. | Carbonized porcelain |
| C. | Moisture or dirt accumulation on porcelain |
| D. | Weak ignition coil |
| E. | Any of the above |
| Answer» C. Moisture or dirt accumulation on porcelain | |
| 62. |
In case of a Petrol engine, the spark plug should produce the spark |
| A. | exactly at the end of compression stroke |
| B. | slightly before the end of compression stroke |
| C. | slightly after the end of exhaust stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» C. slightly after the end of exhaust stroke | |
| 63. |
In automobile, probable cause for ineffective brakes could be |
| A. | Grease on lining |
| B. | Excessive lining wear |
| C. | Drums scored |
| D. | Any of above |
| E. | None of the above |
| Answer» E. None of the above | |
| 64. |
High gum content in petrol may result in |
| A. | detonation |
| B. | misfiring |
| C. | clogging of carburettor |
| D. | none of the above |
| E. | None of the above |
| Answer» D. none of the above | |
| 65. |
In automobile ignition system contact breaker is used for |
| A. | Opening and closing the primary circuit |
| B. | opening and closing the secondary circuit |
| C. | increasing the duration of spark |
| D. | increasing the intensity of spark |
| E. | None of the above |
| Answer» B. opening and closing the secondary circuit | |
| 66. |
Acid used in automobile battery is |
| A. | Hydrochloric acid |
| B. | Sulphuric acid |
| C. | Dilute nitric acid |
| D. | Concentrated nitric acid |
| E. | Hydrofluoric acid |
| Answer» C. Dilute nitric acid | |
| 67. |
Which instrument is used to measure specific gravity |
| A. | Thermometer |
| B. | Hydrometer |
| C. | Hydrometer |
| D. | Anemometer |
| E. | None of the above |
| Answer» D. Anemometer | |
| 68. |
In spark plug the gap between the electrodes is |
| A. | 10 mm |
| B. | around 5 mm |
| C. | around 1 mm |
| D. | less than 1 mm |
| E. | None of the above |
| Answer» E. None of the above | |
| 69. |
The turbulence in diesel engine ensures to |
| A. | Increase the compression pressure |
| B. | Reduce the engine vibrations |
| C. | Bring the fuel quickly in contact with air |
| D. | Increase the fuel consumption |
| E. | Increase the volumetric efficiency |
| Answer» D. Increase the fuel consumption | |
| 70. |
In an automobile the probable cause for dragging brakes could be |
| A. | Lack of clearance |
| B. | Drums out of round |
| C. | Loose wheel bearings |
| D. | Weak retracting spring |
| E. | Any of the above |
| Answer» F. | |
| 71. |
The stationary part of the Wankel engine has an inner contour of |
| A. | elliptical section |
| B. | two lobed epitrochoid section |
| C. | four lobed epitrochoid section |
| D. | none of the above |
| E. | None of the above |
| Answer» C. four lobed epitrochoid section | |
| 72. |
Executive clutch clearance caused by improper adjustment or wear of sliding sleeve, generally results in |
| A. | Clutch slip |
| B. | Clutch failure to disengage |
| C. | Clutch plate over heating |
| D. | Uneven clutch engagement |
| E. | Any of the above |
| Answer» C. Clutch plate over heating | |
| 73. |
Diesel engines are generally preferred for road transport these days because of low |
| A. | Maintenance cost |
| B. | Operating cost |
| C. | Initial cost |
| D. | Prime cost |
| E. | Manufacturing cost |
| Answer» C. Initial cost | |
| 74. |
The device used to measure the clearance between the valve and tappet of an internal combustion engine is |
| A. | Slip gauge |
| B. | Thickness gauge |
| C. | Feeler gauge |
| D. | Snap gauge |
| E. | Micrometer |
| Answer» D. Snap gauge | |
| 75. |
Which of the following symptoms will not show that the combustion is necessarily complete or not? |
| A. | Presence of free carbon in exhaust |
| B. | Presence of carbon monoxide in the exhaust |
| C. | Presence of oxygen is the exhaust |
| D. | Presence of nitrogen in the exhaust |
| E. | None of the above |
| Answer» E. None of the above | |
| 76. |
In a 2-stroke S.I. engine |
| A. | exhaust and transfer (inlet) ports open and cloe simultaneously |
| B. | exhaust port opens 5? before the transfer port and closes 5? after the transfer port |
| C. | exhaust port opens 5? ahead of the transfer port but both ports close simultaneously |
| D. | none of the above |
| E. | None of the above |
| Answer» C. exhaust port opens 5? ahead of the transfer port but both ports close simultaneously | |
| 77. |
The condenser in ignition circuit of an S.I. engine |
| A. | increases the battery voltage |
| B. | decreases the current from battery |
| C. | avoids arcing at contact breaker |
| D. | none of the above |
| E. | None of the above |
| Answer» D. none of the above | |
| 78. |
When fully charged, the terminal voltage per cell for a battery is |
| A. | 1.5 volts |
| B. | 2.7 volts |
| C. | 1.7 volts |
| D. | 6 volts |
| E. | 12 volts |
| Answer» C. 1.7 volts | |
| 79. |
The phenomenon that causes pressure waves resulting in vibration of structure, rough running and melting of piston is |
| A. | detonation |
| B. | pre-ignition |
| C. | knocking |
| D. | none of the above |
| E. | None of the above |
| Answer» B. pre-ignition | |
| 80. |
Over heating of a two stroke air cooled engine cannot be due to |
| A. | Incorrect ignition or valve timing |
| B. | Too lean fuel mixture |
| C. | Lack of cylinder jacket cooling water |
| D. | Partly restricted exhaust system |
| E. | Restricted air cleaner |
| Answer» D. Partly restricted exhaust system | |
| 81. |
Stratification of charge is achieved by |
| A. | use of two or more carburettors |
| B. | locating two spark plugs on a cylinder |
| C. | incorporating an auxiliary chamber |
| D. | combining inlet and exhaust valves into a single unit |
| E. | None of the above |
| Answer» D. combining inlet and exhaust valves into a single unit | |
| 82. |
Balls for a ball bearing are made of |
| A. | Stainless steel |
| B. | Carbon chrome steel |
| C. | High speed steel |
| D. | Mild steel |
| E. | Stainless steel |
| Answer» C. High speed steel | |
| 83. |
The escape of burned gases from the combustion chamber past the pistons and into the crank case is called |
| A. | Gas-loss |
| B. | Crank case explosion |
| C. | By-pass |
| D. | Blow-by |
| E. | Passed gas |
| Answer» E. Passed gas | |
| 84. |
In order to engage securely and prevent dragging the clearance between release bearing and release collar in a clutch is usually |
| A. | 30 - 35 mm |
| B. | 20 - 25 mm |
| C. | 40 - 50 mm |
| D. | 2 - 3 mm |
| E. | 10 - 15 mm |
| Answer» E. 10 - 15 mm | |
| 85. |
The efficiency of an oil bath type air cleaner is usually |
| A. | 90% |
| B. | 50% |
| C. | 60% |
| D. | 99% |
| E. | 80% |
| Answer» E. 80% | |
| 86. |
LPG mainly consists of |
| A. | Methane and ethane |
| B. | Propane and butane |
| C. | Petrol and diesel |
| D. | Hexane and butadiene |
| E. | None of the above |
| Answer» C. Petrol and diesel | |
| 87. |
In a S.I. engine the intake valve closes |
| A. | 35? to 80? after BDC |
| B. | 25? to 80? before BDC |
| C. | At TdDC |
| D. | 10? to 20? before |
| E. | At BDC |
| Answer» B. 25? to 80? before BDC | |
| 88. |
For the best utilization of fuel, in the engine cylinder, the air supply should be |
| A. | About 10% surplus |
| B. | 15 to 20 percent deficient |
| C. | About 25% surplus |
| D. | 5 to 10 percent deficient |
| E. | Chemically correct |
| Answer» B. 15 to 20 percent deficient | |
| 89. |
Which one of the following is a correct statement |
| A. | the exhaust valve of a four stoke I.C. engine should open exactly at the end of expansion stroke |
| B. | in actual practice, inlet valve of a four stroke I.C. engine should open exactly at the start of suction stroke |
| C. | the inlet valve remains open approximately for 180? |
| D. | valve overlap is the angle during which both the inlet and exhaust valves remain open simultaneously |
| E. | None of the above |
| Answer» E. None of the above | |
| 90. |
In a Diesel engine the duration between the time of injection and the time of ignition is called |
| A. | Spil cut off |
| B. | Delay period |
| C. | Period of injection |
| D. | Period of ignition |
| E. | None of the above |
| Answer» C. Period of injection | |
| 91. |
A heat-treated glass generally used in automobiles upon cracking bursts into |
| A. | Sharp edged fragments |
| B. | Small particles |
| C. | Does not disintegrate |
| D. | Either of the above |
| E. | None of the above |
| Answer» C. Does not disintegrate | |
| 92. |
The function of Diesel feed pump (when ever provided) is to |
| A. | Pump the fuel to the injector |
| B. | Pump the fuel from the tank into the injection pump |
| C. | Send back the fuel from the injector into the tank |
| D. | Pump the oil into the main gallery |
| E. | Pump the fuel from the injection pump to the injector |
| Answer» C. Send back the fuel from the injector into the tank | |
| 93. |
Clutch slippage while clutch is engaged is particularly noticeable |
| A. | During acceleration |
| B. | At low speed |
| C. | While starting the engine |
| D. | During idling |
| E. | During braking |
| Answer» B. At low speed | |
| 94. |
Circumferential grooves on tyres |
| A. | Lessen the danger of skidding |
| B. | Increase load carrying capacity |
| C. | Provide good traction |
| D. | Remove any stones etc. from sticking to the tyre |
| E. | All of the above |
| Answer» B. Increase load carrying capacity | |
| 95. |
The knocking in S.I. engines can be prevented if the end mixture is having |
| A. | high density |
| B. | medium density |
| C. | low density |
| D. | none of the above |
| E. | None of the above |
| Answer» D. none of the above | |
| 96. |
Bead of a tyre constitutes |
| A. | metal foundations of the tyre |
| B. | side walls of the tyre |
| C. | shoulder region |
| D. | none of the above |
| E. | None of the above |
| Answer» B. side walls of the tyre | |
| 97. |
When not in use, the self-discharge of an automobile battery in dry weather is usually |
| A. | 0.5 to 1% |
| B. | 7 to 7.5% |
| C. | Not more than 10% |
| D. | Not more than 15% |
| E. | Any of the above |
| Answer» B. 7 to 7.5% | |
| 98. |
Dirt or gum in fuel nozzle or jets may cause |
| A. | Excessive fuel consumption |
| B. | Uneven engine speed |
| C. | Smoky black exhaust |
| D. | Lack of engine power |
| E. | White exhaust |
| Answer» D. Lack of engine power | |
| 99. |
A thermostat is provided in automobile engines for |
| A. | Controlling the temperature of the piston |
| B. | Regulating the temperature of lubricating oil |
| C. | Regulating the temperature of suction air |
| D. | Regulating the temperature of haust gases. |
| E. | Controlling the temperature of the cooling system |
| Answer» F. | |
| 100. |
The probable cause for uneven wear of tyres for a truck could be |
| A. | Low tyre pressure |
| B. | Excessive camber |
| C. | Tyres overloaded |
| D. | Incorrect castor |
| E. | Any of the above |
| Answer» F. | |