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4

The compression ratio for Diesel engines usually lies in the range of

A. 6-10

B. 10-1

C. 15-25

D. 25-40

Correct Answer :

C. 15-25


Related Questions

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4

The petrol engines are also known as

A. Spark ignition (S.I.) engines

B. Compression ignition (C.I.) engines

C. Steam engines

D. None of these

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4

Instead of valves, the ports are used in case of

A. Four stroke I.C. engines

B. Two stroke I.C. engines

C. V6 engines

D. None of these

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4

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.

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4

If clearance volume of I.C. engines is increased, the compression ratio will

A. Increase

B. Decrease

C. Remain constant

D. Be doubled

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4

When the brake pedal free play is less than the specified value, then the

A. Brake drags

B. Brake fades

C. Vapour locking occurs in the brake lines

D. Antilock braking system malfunctions

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4

If the air-fuel mixture ignites before the spark takes place at spark plug, the condition is called

A. Detonation

B. Ignition

C. Pre-ignition

D. Rumble

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4

In a single dry plate clutch, torsional vibrations are absorbed by

A. Coil springs known as torsional springs

B. Cushion springs

C. Central hub

D. Clutch pedal

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4

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)

A. P.L.A.N/2

B. P.L.A.N

C. 2 × P.L.A.N

D. P.L.A.N/4

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4

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

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4

The basic purpose of providing caster angle on wheels is to

A. Prevent uneven tyre wear

B. Maintain directional control

C. Bring the road contact of the tyre under the point of load

D. Compensate for wear in the steering linkage

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4

The material generally used for cylinder sleeves is

A. Aluminium

B. Ceramic

C. Cast iron

D. Fibre reinforced plastic

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4

The ignition in a spark ignition engine takes place when the piston is

A. Exactly at the T.D.C. position on its compression stroke

B. Approaching the T.D.C. position on its compression stroke

C. Leaving the T.D.C. position on its compression stroke

D. Approaching the T.D.C position on its exhaust stroke

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4

Vulcanizing means

A. Heating rubber under pressure

B. Spraying with special paint

C. Melting rubber while stirring it

D. None of these

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4

The main task of a battery in automobiles is to

A. Supply electricity to the alternator

B. Act as a reservoir or stabilizer of electricity

C. Supply electricity to the vehicle's electrical system at all times while the engine is running

D. Supply a large amount of power to turn the starter motor when the engine is being started

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4

The exhaust gas from petrol engine contains

A. Petrol vapours

B. Water vapours

C. Carbon monoxide

D. All of these

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4

The purpose of transmission in an automobile is

A. To vary the speed of automobile

B. To vary the torque at the wheels

C. To vary the power of automobile

D. None of these

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4

In a Diesel engine, the fuel is ignited by

A. An electric spark

B. The heat of compression

C. The hot exhaust

D. None of these

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4

The crescent shaped cavity on the piston head top surface is called as

A. Piston oil hole

B. Snap ring

C. Valve recess

D. Valve clearance

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4

If the air-fuel mixture in a spark ignition engine is too rich, then airfuel ratio is about

A. 17 : 1

B. 15 : 1

C. 13 : 1

D. 10 : 1

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4

The component that connects the steering rack to the knuckles is

A. Tie rod

B. Sector gear

C. Pivot

D. Spline

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4

The power actually developed inside the engine cylinder is called as

A. Indicated power

B. Brake power

C. Frictional power

D. None of these

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4

The minimum parking brake force is generally ________ of gross vehicle mass (GVM).

A. 5 %

B. 10 %

C. 15 %

D. 20 %

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4

The basic part of the engine, to which the other engine parts are attached or assembled is the

A. Cylinder head

B. Crankshaft

C. Cylinder block

D. Oil pan

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4

The main function of a master cylinder is to

A. Adjust the extent of brake pedal free play

B. Boost the force applied to brake pedal

C. Convert brake pedal force into hydraulic pressure

D. Ensure that all the wheel brakes are supplied with the same amount of fluid pressure

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4

The advantage of the fuel injection system over the carburettor system is

A. Improved fuel efficiency

B. Improved emission

C. Improved power output

D. All of these

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4

The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is

A. 1.143 N

B. 11.43 N

C. 114.3 N

D. 1143 N

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4

The basic function of the suspension is to

A. Absorbs vibration and impact forces from the road surface

B. Ensure that the steering wheel can deliver a suitable amount of steering force

C. Ensure that wheel alignment is not disturbed during driving

D. Automatically correct the effects of over steering

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4

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

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4

The specific gravity of Diesel is about

A. 0.65

B. 0.75

C. 0.85

D. 0.95

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4

In a four stroke engine for each crankshaft revolution, the camshaft revolves

A. One half turn

B. One turn

C. Two turns

D. Four turns