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This section includes 365 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
151. |
The piston compression rings are made of |
A. | Cast iron |
B. | Steel |
C. | Aluminium |
D. | Bronze |
Answer» B. Steel | |
152. |
The function of an oil control orifice is that it |
A. | Returns cylinder head lubricating oil to the oil pan at high speed |
B. | Turns oil into fine mist for spray lubrication |
C. | Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes |
D. | Removes impurities from cylinder head lubricating oil |
Answer» D. Removes impurities from cylinder head lubricating oil | |
153. |
During suction stroke, the inside pressure of cylinder is |
A. | More than the atmospheric pressure |
B. | Less than the atmospheric pressure |
C. | Equal to the atmospheric pressure |
D. | None of these |
Answer» C. Equal to the atmospheric pressure | |
154. |
The two rows of cylinders in a 'V' type engine are generally arranged at |
A. | 45° |
B. | 60° |
C. | 90° |
D. | 130° |
Answer» C. 90° | |
155. |
The component that is responsible for converting the rotation of the steering wheel into lateral motion is the |
A. | Steering wheel |
B. | Steering shaft |
C. | Steering gearbox |
D. | Tie rod |
Answer» D. Tie rod | |
156. |
The function of a proportioning control valve (PCV) in a brake system is to |
A. | Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation |
B. | Reduce the brake fluid pressure when the brakes approach their lockup point |
C. | Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level |
D. | Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level |
Answer» E. | |
157. |
In a square type engine |
A. | Geometrical shape is square |
B. | Diameter and length of piston are same |
C. | Two cylinders are placed horizontal and two vertical |
D. | Stroke length and cylinder bore are same |
Answer» E. | |
158. |
An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression ratio is |
A. | 7 : 1 |
B. | 8 : 1 |
C. | 9 : 1 |
D. | 10 : 1 |
Answer» D. 10 : 1 | |
159. |
The component in the radiator of an automobile that increases the boiling point of water is |
A. | Drain plug |
B. | Water jacket |
C. | Vacuum valve |
D. | Pressure cap |
Answer» E. | |
160. |
The process of supplying the intake air to the engine cylinder at a pressure greater than the pressure of the surrounding atmosphere is known as |
A. | Supercharging |
B. | Auto ignition |
C. | Scavenging |
D. | Detonation |
Answer» B. Auto ignition | |
161. |
Thinner is added to the paint in order to |
A. | Make pigments and resin mix easily |
B. | Make paint film hard |
C. | Optimise its viscosity |
D. | None of these |
Answer» D. None of these | |
162. |
The negative terminal post on the top of a battery is |
A. | Smaller than the positive terminal post |
B. | Larger than the positive terminal post |
C. | Of the same size as the positive terminal post |
D. | None of these |
Answer» B. Larger than the positive terminal post | |
163. |
Two speed reverse gear arrangements is generally provided in case of |
A. | Passenger cars |
B. | Matadors |
C. | Tractors |
D. | Trucks |
Answer» D. Trucks | |
164. |
The starter motor is driven by |
A. | Chain drive |
B. | Gear drive |
C. | Flat belt drive |
D. | V-belt drive |
Answer» C. Flat belt drive | |
165. |
The three basic cylinder arrangements for automotive engines are |
A. | Flat, radial, and V |
B. | In a row, in line, and opposed |
C. | In line, V, and opposed |
D. | V, double row, and opposed |
Answer» D. V, double row, and opposed | |
166. |
Which of the following is not an automobile? |
A. | Motor cycle |
B. | Passenger car |
C. | Aeroplane |
D. | Truck |
Answer» D. Truck | |
167. |
The lower cylindrical portion of the piston which improves piston cooling performance is called |
A. | Piston crown |
B. | Connecting rod |
C. | Piston pin boss |
D. | Piston skirt |
Answer» E. | |
168. |
Odometer is an instrument used for measurement of |
A. | Power |
B. | Fuel consumption |
C. | Engine r.p.m. |
D. | Distance |
Answer» E. | |
169. |
The maximum torque multiplication ratio in a torque converter is about |
A. | 2.5 |
B. | 10 |
C. | 25 |
D. | 40 |
Answer» B. 10 | |
170. |
The main function of a resonator is that it |
A. | Regulates the intake air flow rate |
B. | Reduces the intake air noise |
C. | Enhances intake efficiency |
D. | Regulates the intake air temperature |
Answer» C. Enhances intake efficiency | |
171. |
The fuel that detonates easily, is |
A. | N-heptane |
B. | Iso-octane |
C. | Benzene |
D. | Alcohol |
Answer» B. Iso-octane | |
172. |
When the piston is at T.D.C., the volume above the piston in the combustion chamber is the |
A. | Clearance volume |
B. | Cylinder volume |
C. | Exhaust volume |
D. | None of these |
Answer» B. Cylinder volume | |
173. |
The condition that results in large quantities of HC emission is |
A. | High temperature combustion |
B. | Incomplete combustion |
C. | Low temperature combustion |
D. | High atmospheric temperature combustion |
Answer» C. Low temperature combustion | |
174. |
In a four wheel drive (4WD), the numbers of gear boxes are |
A. | 1 |
B. | 2 |
C. | 3 |
D. | 4 |
Answer» C. 3 | |
175. |
The condition that results in large quantities of CO emission is |
A. | Insufficient air during combustion |
B. | Insufficient fuel during combustion |
C. | Low temperature combustion |
D. | High temperature combustion |
Answer» B. Insufficient fuel during combustion | |
176. |
The advantage of having a tandem master cylinder arrangement in automobiles is that it |
A. | Enhances safety by serving two independent lines in a divided line brake circuit |
B. | Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss |
C. | Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side |
D. | Boosts the brake fluid pressure to reduce the force required to depress the brake pedal |
Answer» B. Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss | |
177. |
The painting of automobiles is done to |
A. | Prevent rust from growing on the body |
B. | Improve its external appearance |
C. | Retain the characteristics of steel for long |
D. | All of these |
Answer» E. | |
178. |
If a tyre is designated as 175/65 R-14 82-S, then the aspect ratio for the tyre is |
A. | 175 |
B. | 65 |
C. | 14 |
D. | 82 |
Answer» C. 14 | |
179. |
The clutch is located between the transmission and the |
A. | Engine |
B. | Rear axle |
C. | Propeller shaft |
D. | Differential |
Answer» B. Rear axle | |
180. |
A basic difference between the spark ignition engine and the Diesel engine is that the |
A. | Diesel engine compresses air alone instead of an air-fuel mixture |
B. | Air temperature ignites the fuel in the Diesel engine |
C. | Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke |
D. | All of the above |
Answer» E. | |
181. |
The function of a radiator fan in the cooling system is that |
A. | It blows air through the radiator when necessary |
B. | It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump |
C. | It cools the engine by blowing air onto the cylinder block |
D. | It draws heat out of the engine compartment |
Answer» B. It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump | |
182. |
The heat transfer from coolant to air in the radiator of an automobile engine takes place by |
A. | Radiation only |
B. | Convention only |
C. | Convection and radiation |
D. | Conduction, convection and radiation |
Answer» D. Conduction, convection and radiation | |
183. |
The compression ratio of a petrol engine is nearly |
A. | 4:1 |
B. | 8:1 |
C. | 15:1 |
D. | 20:1 |
Answer» C. 15:1 | |
184. |
The device for smoothening out the power impulses from the engine is called |
A. | Clutch |
B. | Differential |
C. | Flywheel |
D. | Torque converter |
Answer» D. Torque converter | |
185. |
Petrol that detonates easily is called |
A. | High octane petrol |
B. | Low octane petrol |
C. | Unleaded petrol |
D. | Blended fuel |
Answer» C. Unleaded petrol | |
186. |
The ball joints are used on the tie rod ends, because they |
A. | Reduce the amount of noise generated |
B. | Reduce the amount of sliding resistance |
C. | Can deal with movement of the suspension both vertically and in other directions |
D. | Improve the force transmission speed |
Answer» D. Improve the force transmission speed | |
187. |
The frequency of flashing of light per minute in a direction (side turn) indicator is about |
A. | 9 |
B. | 90 |
C. | 900 |
D. | 9000 |
Answer» C. 900 | |
188. |
The power actually developed inside the engine cylinder is called as |
A. | Indicated power |
B. | Brake power |
C. | Frictional power |
D. | None of these |
Answer» B. Brake power | |
189. |
In a four cylinder inline engine, the number of firing strokes in one revolution of the crank is |
A. | 1 |
B. | 2 |
C. | 3 |
D. | 4 |
Answer» C. 3 | |
190. |
In petrol engines, during suction stroke, _________ is drawn in the cylinder |
A. | Air and fuel |
B. | Only fuel |
C. | Only air |
D. | None of these |
Answer» B. Only fuel | |
191. |
The ignition coil is used to |
A. | Step up current |
B. | Step down current |
C. | Step up voltage |
D. | Step down voltage |
Answer» D. Step down voltage | |
192. |
The timing belt is attached to the camshaft pulley and |
A. | Timing belt drive pulley |
B. | Distributor |
C. | Radiator fan pulley |
D. | Alternator pulley |
Answer» B. Distributor | |
193. |
The antiknock property of compression ignition engine fuel can be improved by adding |
A. | Tetraethyl lead |
B. | Trimethyl pentane |
C. | Amyl nitrate |
D. | Hexadecane |
Answer» D. Hexadecane | |
194. |
In a hydraulic power steering system, the power steering pump is driven by a |
A. | Belt driven by camshaft |
B. | Chain driven by crankshaft |
C. | Belt driven by drive-shaft |
D. | Belt driven by crankshaft |
Answer» E. | |
195. |
Damper in an automobile is used to |
A. | Absorb the energy |
B. | Dissipate the energy |
C. | Release the energy |
D. | Increase the energy |
Answer» C. Release the energy | |
196. |
The acid used in automobile battery is |
A. | Hydrochloric acid |
B. | Hydrofluoric acid |
C. | Nitric acid |
D. | Sulphuric acid |
Answer» E. | |
197. |
The effect of vapour locking on the brake performance is that the |
A. | Brakes function more effectively |
B. | Brakes fail completely |
C. | Brake operation is delayed after depression of the brake pedal |
D. | Vapour locking has no effect on brake performance |
Answer» C. Brake operation is delayed after depression of the brake pedal | |
198. |
Engine misfiring is likely to result from |
A. | Spark plug gap too small |
B. | Spark plug gap too wide |
C. | Vapours lock in the fuel only |
D. | Incorrect fuel air mixture |
Answer» C. Vapours lock in the fuel only | |
199. |
In an engine, the temperature of the piston will be more at the |
A. | Crown of the piston |
B. | Skirt of the piston |
C. | Piston walls |
D. | Piston rings |
Answer» B. Skirt of the piston | |
200. |
The purpose of a thermostat in an engine cooling system is to |
A. | Prevent the coolant from boiling |
B. | Allow the engine to warm up quickly |
C. | Indicate the coolant temperature |
D. | Pressurise the system to raise the boiling point |
Answer» C. Indicate the coolant temperature | |