MCQOPTIONS
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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.
| 101. |
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» C. Flank | |
| 102. |
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» D. Wet type | |
| 103. |
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» E. None of the above | |
| 104. |
The number of plies in a truck tyre is usually |
| A. | 2 |
| B. | 5--8 |
| C. | 8--10 |
| D. | 3 |
| E. | 12--16 |
| Answer» F. | |
| 105. |
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» C. cross-head | |
| 106. |
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» B. Lessen the danger of skidding | |
| 107. |
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» E. Any of the above | |
| 108. |
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» D. Carbon monoxide | |
| 109. |
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» E. Large than that of exhaust valve | |
| 110. |
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» C. Shoulder | |
| 111. |
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» D. Power output | |
| 112. |
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» C. slightly before the end of suction stroke | |
| 113. |
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» C. Run down battery | |
| 114. |
1000 mm diameter tyre is generally used on |
| A. | Scooters |
| B. | Jeeps |
| C. | Motorcycles |
| D. | Trucks |
| E. | Mopads |
| Answer» E. Mopads | |
| 115. |
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» B. battery system | |
| 116. |
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» D. 1-2-4-2 | |
| 117. |
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» B. C.I. engines | |
| 118. |
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» E. Radial bearing | |
| 119. |
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» D. 24 volts | |
| 120. |
Increasing the temperature of intake air in an I.C. engine will |
| A. | increase the efficiency |
| B. | decrease the efficiency |
| C. | increase or decrease the efficiency |
| D. | None of the above |
| E. | Low ambient temperature |
| Answer» C. increase or decrease the efficiency | |
| 121. |
The function of condenser in the ignition circuit of an SI engine is |
| A. | to interrupt the battery current |
| B. | to enhance the circuit voltage |
| C. | to avoid arcing at the contact breaker and to cause faster decay of primary current |
| D. | none of the above |
| E. | None of the above |
| Answer» D. none of the above | |
| 122. |
Which one of the following is the trouble due to clutch? |
| A. | Dragging |
| B. | Rattling |
| C. | Slipping |
| D. | Grabbing |
| E. | All of the above |
| Answer» F. | |
| 123. |
The phenomenon by which a fuel catches fire without external flame is known as |
| A. | pre-ignition |
| B. | detonation |
| C. | ignition lag |
| D. | auto-ignition |
| E. | None of the above |
| Answer» E. None of the above | |
| 124. |
The knocking in C.I. engine can be prevented if the first element of the fuel and air is having |
| A. | low density |
| B. | medium density |
| C. | high density |
| D. | none of the above |
| E. | None of the above |
| Answer» D. none of the above | |
| 125. |
Driving wheel hearings in automobiles are always |
| A. | Bush bearing |
| B. | Clad metal bearings |
| C. | Anti-friction bearings |
| D. | Either (A) or (B) |
| E. | Either (B) or (C) |
| Answer» D. Either (A) or (B) | |
| 126. |
Morse Test in multicylinders is used to determine |
| A. | Air flow to engine |
| B. | Mechanical efficiency |
| C. | Volumetric efficiency |
| D. | BHP |
| E. | IHP |
| Answer» C. Volumetric efficiency | |
| 127. |
The level of electroyte in automobiles battery should be |
| A. | Exactly at the level of the plates |
| B. | 15 mm below the top of plates |
| C. | 5 - 10 mm below the top of plates |
| D. | Upto the maximum permissible level |
| E. | 10 - 15 mm above top of plates |
| Answer» F. | |
| 128. |
In a diesel engine a clogged nozzle could result in |
| A. | Excessive fuel consumption |
| B. | Over-rich mixture |
| C. | Excessive smoke |
| D. | Failure to start |
| E. | Any of the above |
| Answer» F. | |
| 129. |
Ignition coil is used to |
| A. | Step down voltage |
| B. | Step up power |
| C. | Step down current |
| D. | Step up voltage |
| E. | Step up current |
| Answer» E. Step up current | |
| 130. |
The knocking in S.I. engines is characterised by sudden auto-ignition of the change |
| A. | nearest to the spark plug |
| B. | farthest away from the spark plug |
| C. | in the middle from the spark plug |
| D. | none of the above |
| E. | None of the above |
| Answer» C. in the middle from the spark plug | |
| 131. |
The device in the cooling system that increses the boiling point of the water in the system is called |
| A. | Drain plug |
| B. | Pressure cap |
| C. | Radiator |
| D. | Water jacket |
| E. | Vacuum valve |
| Answer» C. Radiator | |
| 132. |
For a spark plug M 14 x 1.25 the last figure 1.25 stands for |
| A. | Gap between electrodes in mm |
| B. | Pitch of plug thread |
| C. | Electrode diameter in mm |
| D. | Tip width in mm |
| E. | Size of plug thread |
| Answer» C. Electrode diameter in mm | |
| 133. |
The exhaust value remains open approximately for |
| A. | 160? |
| B. | 180? |
| C. | 190? |
| D. | 235? |
| E. | None of the above |
| Answer» E. None of the above | |
| 134. |
Two SI engines run at same speed and develop same power but have different compression ratio. The engine with higher compression ratio will have its ignition advance |
| A. | more than |
| B. | less than |
| C. | equal to |
| D. | none of the above |
| E. | None of the above |
| Answer» C. equal to | |
| 135. |
Exhaust gas leakage into the cooling system is most likely be due to defective |
| A. | Cylinder head gasket |
| B. | Manifold gasket |
| C. | Water pump |
| D. | Radiator |
| E. | Any of the above |
| Answer» B. Manifold gasket | |
| 136. |
Poor compression in a two stroke engine cannot be due to |
| A. | Leaky valves |
| B. | Broken piston rings |
| C. | Leaking cylinder head gasket |
| D. | Poor fits between pistons, rings and cylinders |
| E. | Any of the above |
| Answer» B. Broken piston rings | |
| 137. |
As the number of cylinders on multi-cylinder engines increases the power to weight ratio |
| A. | Has nothing to do with number of cylinders |
| B. | Decreases |
| C. | Increases |
| D. | Remains the same |
| E. | Becomes zero |
| Answer» C. Increases | |
| 138. |
In which case the air fuel ratio is expected to be the highest? |
| A. | Two stroke petrol engine |
| B. | Gas turbine |
| C. | Four stroke diesel engine |
| D. | Two stroke diesel engine |
| E. | Four stroke petrol engine |
| Answer» C. Four stroke diesel engine | |
| 139. |
In case of petrol engine, pre-ignition of the charge during compression stroke is |
| A. | not possible |
| B. | possible |
| C. | possible during power stroke |
| D. | none of the above |
| E. | None of the above |
| Answer» C. possible during power stroke | |
| 140. |
For lubrication of which part of an automobile only grease is used |
| A. | Transmission |
| B. | Steering system |
| C. | Axle drive |
| D. | Tie rod |
| E. | All of the above |
| Answer» E. All of the above | |
| 141. |
Which fuel has maximum resistance to detonation |
| A. | n-heptane |
| B. | Toluene |
| C. | Isoctave |
| D. | Benzene |
| E. | Alcohol |
| Answer» D. Benzene | |
| 142. |
Loss of engine compression can result from |
| A. | Wrong timing |
| B. | Defective fan belt |
| C. | Worn out rings |
| D. | Excessive tappet clearance |
| E. | Excessive tappet clearance |
| Answer» D. Excessive tappet clearance | |
| 143. |
The heating value of petrol is |
| A. | 7650 kcal/kg |
| B. | 10,000-10400 kcal/kg |
| C. | 15000-16000 kcal/kg |
| D. | 8000-8500 kcal/kg |
| E. | 12750-13850 kcal/kg |
| Answer» C. 15000-16000 kcal/kg | |
| 144. |
The breaking up of a liquid into fine droplets by spraying is called |
| A. | Injection |
| B. | Vaporization |
| C. | Atomisation |
| D. | Ionisation |
| E. | Carburetion |
| Answer» D. Ionisation | |
| 145. |
Odometer is |
| A. | An instrument which indicates the condition of the battery |
| B. | An instrument for distance measurement |
| C. | An instrument for BHP measurement |
| D. | An instrument for smoke analysis |
| E. | An instrument used for measurement of fuel consumption |
| Answer» C. An instrument for BHP measurement | |
| 146. |
If the end mixture of S.I. engine is having low temperature and long igition delay, then knocking will |
| A. | accelerate |
| B. | decrease |
| C. | remain constant |
| D. | none of the above |
| E. | None of the above |
| Answer» C. remain constant | |
| 147. |
If the cut-off is decreased, the efficiency of Diesel cycle |
| A. | is equal to Otto cycle |
| B. | is more than Otto cycle |
| C. | is less than Otto cycle |
| D. | approaches to Otto cycle |
| E. | None of the above |
| Answer» E. None of the above | |
| 148. |
Which one of the following is independent of fuel constituents, combustion chamber design, temperature and pressure of compressed charge |
| A. | Pinking |
| B. | Pre-ignition |
| C. | Knocking |
| D. | none of the above |
| E. | None of the above |
| Answer» C. Knocking | |
| 149. |
Which company is not engaged in the manufacture of tyres in India |
| A. | Larsen & Toubro |
| B. | Appollo |
| C. | Modi |
| D. | Good year |
| E. | J.K. |
| Answer» C. Modi | |
| 150. |
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» B. Cataytic converter | |