Automobile Engineering Practice Set-3

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1. In Diesel engines, the duration between the time of injection and the time of ignition is called

Delay period

Spill cut-off

Ignition period

Injection period

2. The most commonly used supplementary restraint system (SRS) component is

Steering

Brake

Seat belt

Airbag

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

Check valve

Relief valve

Case

Element

4. A clutch is usually designed to transmit maximum torque which is

None of these

80% of the maximum engine torque

150% of the maximum engine torque

Equal to the maximum engine torque

5. In automobiles G.V.W. refers to

Gross vehicle weight

Gross vehicle wheel base

Gross vehicle width

Gross vehicle wheel track

6. A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Makes the steering more responsive

Reduces the amount of kickback for large steering angles

Allows the steering wheel to be turned by a greater amount when steering

Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion

7. The antiknock property of compression ignition engine fuel can be improved by adding

Amyl nitrate

Trimethyl pentane

Tetraethyl lead

Hexadecane

8. The aluminium alloy is used in cylinder blocks because

Material cost is low

The piston is also made of aluminium alloy

It does not require any cylinder liners

It is lighter and has good heat dissipation characteristics

9. The size of engine cylinder is referred in terms of its

Bore and length

Diameter and bore

Bore and stroke

Displacement and efficiency

10. The torque available at the contact between driving wheels and road is known as

Tractive effort

Brake effort

Clutch effort

None of these

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11. The three basic cylinder arrangements for automotive engines are

Flat, radial, and V

V, double row, and opposed

In a row, in line, and opposed

In line, V, and opposed

12. The main function of the tread pattern on tyre is that

In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface

The crests between the tread grooves absorb road noise

The tread pattern protects the tyre's inner carcass from small stones and pieces of glass

The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

13. In Diesel engines, during suction stroke, _________ is drawn in the cylinder.

None of these

Only fuel

Only air

Air and fuel

14. The main function of the brake fluid is

Power transmission

None of these

Lubrication

Cooling

15. Which part of the automobile tyre is subjected to greatest flexing action?

Tread

Bead

Shoulder

Side wall

16. In a ventilated disc brake

Caliper is covered with cooling fins

Disc contains many small holes for optimum cooling performance

A duct directs air towards the caliper for cooling while the vehicle is moving

Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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

One half turn

One turn

Two turns

Four turns

18. The engine oil level should be checked

Immediately after the ignition switch is turned off

While the engine is running

A few minutes after the ignition switch is turned off

While the engine is running at high idle speed

19. An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression ratio is

7 : 1

8 : 1

10 : 1

9 : 1

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

Valve clearance

Snap ring

Piston oil hole

Valve recess

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21. The connecting rod connects the piston and the

Cylinder block

Cylinder head

Crankshaft

Camshaft

22. The main function of an exhaust muffler is the

Optimization of exhaust efficiency

Reduction of exhaust noise

Reduction of the exhaust gas volume

Reduction of nitrogen oxide in the exhaust gases

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

Lubrication performance

Cooling efficiency

None of these

Resistance to wear

24. The major purpose of an electronically controlled automatic transmission is that this type of transmission

Eliminates the gear shaft lever

Eliminates gear clutches

Reduces shift shock and achieves more efficient transmission of engine torque

Reduces the number of automatic transmission components

25. If the engine coolant leaks into the engine oil, then engine oil

Become foamy

Turns black

None of these

Appears milky

26. The clutch is located between the transmission and the

Rear axle

Differential

Engine

Propeller shaft

27. If the spark plug deposit indicates black coating of soot, it indicates that the engine has been generally operating on

Most economical mixture

Too rich mixture

Too lean mixture

Stoichiometric mixture

28. In bias ply tyres

All of the above

All plies run parallel to one another

One ply layer runs diagonally one way and another layer runs diagonally the other way

Belts of steel mesh are used in the tyres

29. The basic purpose of tyres is to

Substitute for springs

None of these

Grip the road and provide good traction

Act as brake

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

Wheel piston or cylinder

Anchor pin

Wheel rim or axle

Brake drum

Automobile Engineering Practice Set-3

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