Practice Automobile Engineering Multiple Choice Questions with Answers Quiz-6

Q.1.

A clutch is usually designed to transmit maximum torque which is

Equal to the maximum engine torque
80% of the maximum engine torque
150% of the maximum engine torque
None of these

Explanation

Q.2.

The main purpose of an engine's air cleaner is that it

Controls the engine's air intake volume
Reduces the engine's air intake noise
Prevents rain water from entering the engine
Prevents dust and other foreign matter from entering the engine

Explanation

Q.3.

It is necessary to maintain the valve clearances as they

Reduce the resistance to sliding that occurs between the cam and the tappet
Allow for lengthening of the valves owing to the heat of combustion
Increase the speed at which the valves move up and down
Make the crankshaft turn smoothly

Explanation

Q.4.

The petrol engine works on

Otto cycle
Carnot cycle
Diesel cycle
Rankine cycle

Explanation

Q.5.

The Diesel engine works on

Otto cycle
Carnot cycle
Diesel cycle
Rankine cycle

Explanation

Q.6.

The component of the oil filter that prevents the passage of metal particles and sludge is

Element
Relief valve
Check valve
Case

Explanation

Q.7.

The characteristic that is enhanced by the use of cylinder sleeves is

Cooling efficiency
Resistance to wear
Lubrication performance
None of these

Explanation

Q.8.

The cetane number of a Diesel fuel is a measure of

Volatility
Viscosity
Ignition quality
Delay period

Explanation

Q.9.

The sequence in which the force is transmitted through a brake system when the brake pedal is depressed is

Brake pedal, master cylinder, brake lines, vacuum servo mechanism, brake pads
Brake pedal, vacuum servo mechanism, master cylinder, brake lines, brake pads
Brake pedal, master cylinder, vacuum servo mechanism, brake lines, brake pads
Brake pedal, brake lines, vacuum servo mechanism, master cylinder, brake pads

Explanation

Q.10.

The purpose of turning radius gauges is to measure the

Contact areas of the tyres
Free plays of the steering wheel
Turning radius of the left and right wheels
Difference in the toe angles of the left and right wheels

Explanation

Q.11.

Two advantages of using helical gears rather than spur gears in a transmission system are

Strength and cost
Strength and less end thrust
Noise level and strength
Noise level and economy

Explanation

Q.12.

The best fuels for compression ignition engines are

Straight chain paraffin
Aromatics
Branched chain paraffin
Naphthalene

Explanation

Q.13.

In Spark Ignition Engine

Only air is introduced into the cylinder
The mixture of air and fuel is introduced into the cylinder from carburettor
Both (A) and (B)
None of these

Explanation

Q.14.

The exhaust gas from petrol engine contains

Petrol vapours
Water vapours
Carbon monoxide
All of these

Explanation

Q.15.

When the front wheels of a vehicle are locked during braking, then

Stopping distance becomes extremely long
Front tyres skid across the road surface, and the vehicle spins around
Rear tyres skid across the road surface, and the vehicle spins around
Driver loses control over the steering, and the vehicle continues moving in its current direction

Explanation

Q.16.

What type of bearing is used for main bearings and connecting rod bearings?

Ball bearings
Plain bearings
Needle roller bearing
Taper roller bearing

Explanation

Q.17.

During braking, the brake shoe is moved outward to force the lining against the

Wheel piston or cylinder
Anchor pin
Brake drum
Wheel rim or axle

Explanation

Q.18.

The cam shaft in an engine is always mounted

Parallel to the crankshaft
Perpendicular to the crankshaft
Inclined to the crankshaft
None of these

Explanation

Q.19.

The included angle is the sum of the

Camber and castor
Castor and S.A.I.
Camber and S.A.I.
Camber and toe in

Explanation

Q.20.

In bias ply tyres

All plies run parallel to one another
Belts of steel mesh are used in the tyres
One ply layer runs diagonally one way and another layer runs diagonally the other way
All of the above

Explanation

Q.21.

In radial tyres

One ply layer runs diagonally one way and another layer runs diagonally the other way
All plies run parallel to one another and vertical to tyre bead
Inner tubes are always used
None of these

Explanation

Q.22.

The gradient resistance to a vehicle having a mass of 980 kg moving on an incline of 10° is

1.6694 N
16.694 N
166.94 N
1669.4 N

Explanation

Q.23.

In aluminium cylinder blocks, the cylinder liners are made of

Aluminium
Ceramic
Brass
Cast iron

Explanation

Q.24.

The brake pedal during ABS operation

Is pushed upward forcefully
Pedal stroke becomes longer
Transmits slight kickback to the driver's foot
All of the above

Explanation

Q.25.

In a ventilated disc brake

A duct directs air towards the caliper for cooling while the vehicle is moving
Caliper is covered with cooling fins
Disc contains many small holes for optimum cooling performance
Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

Explanation

Q.26.

A traction control system (TCS) in automobiles controls the

Vibrations on the steering wheel
Engine power during acceleration
Torque that is transmitted by the tyres to the road surface
Stopping distance in case of emergency

Explanation

Q.27.

The number of exhaust manifolds in a V6 engine is

One
Two
Four
Eight

Explanation

Q.28.

The most commonly used power plant in automobiles is

Gas turbine
I.C. engine
Battery
None of these

Explanation

Q.29.

The commonly used antifreeze solution in automobiles is

Carbon disulphide
Ethylene glycol
Ammonium chloride
Freon-12

Explanation

Q.30.

The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)

P.L.A.N/2
P.L.A.N
2 × P.L.A.N
P.L.A.N/4

Explanation

Q.31.

The crankcase dilution means

dilution of fuel in the crankcase
dilution of oil by water in the crankcase
dilution of lubrication oil by fuel in the crankcase
dilution of mixture passing through crankcase in two-stroke engines

Q.32.

The main cause for the change in engine oil viscosity is

humidity
temperature
vibration
contamination

Q.33.

The materials used for cylinder block are

cast iron and steel
cast iron and aluminium alloy
steel and aluminium alloy
brass and steel

Q.34.

The problems caused by the wheel imbalance are

hard steering and hard ride
poor acceleration and hard steering
steering wheel vibrations and uneven tyre wear
poor acceleration and reduced fuel efficiency

Q.35.

The condition that results in large quantities of CO emission is

insufficient air during combustion
insufficient fuel during combustion
low temperature combustion
high temperature combustion

Q.36.

Vulcanizing means

heating rubber under pressure
spraying with special paint
melting rubber while stirring it
none of these

Q.37.

The positive plates of a lead acid battery has

lead peroxide (PbO₂)
spongy lead (Pb)
lead sulphate (PbSO₄)
sulphuric acid (H₂SO₄)

Q.38.

When the piston is at T.D.C, the volume above the piston in the combustion chamber is the

clearance volume
cylinder volume
exhaust volume
none of these

Q.39.

The connecting rod lower end is connected to the relevant __________ of crankshaft.

big end
crank arm
journal
small end

Q.40.

In comparison with a radial tyre, one advantage of a bias-ply tyre is

longer life
lower rolling resistance
smoother ride at low speeds
none of these

Q.41.

The engine torque increases with the increase in engine speed up to a certain point after which it starts to fall down.

Correct
Incorrect

Q.42.

The path taken by intake air is

carburettor (or throttle body) - air cleaner - intake manifold - intake ports - cylinders
air cleaner - carburettor (or throttle body) -intake ports - intake manifold - cylinders
air cleaner - intake manifold - carburettor (or throttle body) - intake ports - cylinders
air cleaner - carburettor (or throttle body) - intake manifold - intake ports - cylinders

Q.43.

In a hydraulic power steering system, the power steering pump is driven by a

belt-driven by camshaft
chain-driven by crankshaft
belt-driven by driveshaft
belt-driven by crankshaft

Q.44.

The connecting rod connects the piston and the

cylinder head
cylinder block
camshaft
crankshaft

Q.45.

The parking brake generally acts on

front wheels
rear wheels
front and rear wheels
propeller shaft

Q.46.

The sequence order of events in a four-stroke engine is

suction - exhaust - power - compression
suction - power - compression - exhaust
suction - compression - power - exhaust
exhaust - compression - power - suction

Q.47.

The instrument used to check specific gravity of acid in a battery is

hydrometer
hygrometer
anemometer
multimeter

Q.48.

The basic purpose of tyre rotation on automobiles is to

avoid ply separation
equalize wear
get better ride
none of these

Q.49.

In a square type engine

geometrical shape is square
diameter and length of piston are same
two cylinders are placed horizontal and two vertical
stroke length and cylinder bore are same

Q.50.

The commonly used antifreeze solution in automobiles is

carbon disulphide
ethylene glycol
ammonium chloride
freon-12

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