Automobile Engineering Practice Set-3

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

Seat belt

Airbag

Brake

Steering

2. The connecting rod connects the piston and the

Crankshaft

Camshaft

Cylinder head

Cylinder block

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

Spill cut-off

Ignition period

Injection period

Delay period

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

Snap ring

Piston oil hole

Valve recess

Valve clearance

5. In bias ply tyres

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

Belts of steel mesh are used in the tyres

All plies run parallel to one another

All of the above

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

Check valve

Relief valve

Element

Case

7. The main function of an exhaust muffler is the

Reduction of exhaust noise

Optimization of exhaust efficiency

Reduction of nitrogen oxide in the exhaust gases

Reduction of the exhaust gas volume

8. In a ventilated disc brake

Caliper is covered with cooling fins

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

Disc contains many small holes for optimum cooling performance

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

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

Displacement and efficiency

Diameter and bore

Bore and stroke

Bore and length

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

None of these

150% of the maximum engine torque

Equal to the maximum engine torque

80% of the maximum engine torque

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

Reduces the amount of kickback for large steering angles

Makes the steering more responsive

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

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

12. The aluminium alloy is used in cylinder blocks because

It does not require any cylinder liners

The piston is also made of aluminium alloy

It is lighter and has good heat dissipation characteristics

Material cost is low

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

Hexadecane

Tetraethyl lead

Amyl nitrate

Trimethyl pentane

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

Eliminates the gear shaft lever

Eliminates gear clutches

Reduces the number of automatic transmission components

Reduces shift shock and achieves more efficient transmission of engine torque

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

Gross vehicle wheel base

Gross vehicle wheel track

Gross vehicle weight

Gross vehicle width

16. The clutch is located between the transmission and the

Engine

Propeller shaft

Differential

Rear axle

17. The main function of the brake fluid is

Power transmission

Cooling

None of these

Lubrication

18. The basic purpose of tyres is to

None of these

Act as brake

Substitute for springs

Grip the road and provide good traction

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

Tread

Shoulder

Side wall

Bead

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

One turn

One half turn

Two turns

Four turns

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

Only air

Only fuel

None of these

Air and fuel

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

None of these

Turns black

Appears milky

Become foamy

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

Wheel piston or cylinder

Brake drum

Anchor pin

Wheel rim or axle

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

7 : 1

9 : 1

10 : 1

8 : 1

25. The three basic cylinder arrangements for automotive engines are

In a row, in line, and opposed

In line, V, and opposed

Flat, radial, and V

V, double row, and opposed

26. The engine oil level should be checked

A few minutes after the ignition switch is turned off

While the engine is running

While the engine is running at high idle speed

Immediately after the ignition switch is turned off

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

Clutch effort

Tractive effort

None of these

Brake effort

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

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

The crests between the tread grooves absorb road noise

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

Lubrication performance

Cooling efficiency

Resistance to wear

None of these

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

Most economical mixture

Too lean mixture

Stoichiometric mixture

Too rich mixture

Automobile Engineering Practice Set-3

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