Explore topic-wise MCQs in Automobile Engineering.

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