Automobile Engineering Practice Set-3

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

Only fuel

Only air

Air and fuel

None of these

2. The basic purpose of tyres is to

None of these

Substitute for springs

Act as brake

Grip the road and provide good traction

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

Hexadecane

Trimethyl pentane

Amyl nitrate

Tetraethyl lead

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

Reduces shift shock and achieves more efficient transmission of engine torque

Eliminates gear clutches

Reduces the number of automatic transmission components

Eliminates the gear shaft lever

5. The connecting rod connects the piston and the

Cylinder head

Crankshaft

Cylinder block

Camshaft

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

Brake

Steering

Airbag

Seat belt

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

Too rich mixture

Stoichiometric mixture

Most economical mixture

Too lean mixture

8. The main function of the brake fluid is

Lubrication

Cooling

None of these

Power transmission

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

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

Reduces the amount of kickback for large steering angles

Makes the steering more responsive

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

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

Cooling efficiency

None of these

Resistance to wear

Lubrication performance

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

Element

Check valve

Relief valve

Case

12. The main function of an exhaust muffler is the

Reduction of the exhaust gas volume

Reduction of exhaust noise

Optimization of exhaust efficiency

Reduction of nitrogen oxide in the exhaust gases

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

One half turn

Two turns

Four turns

One turn

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

Spill cut-off

Injection period

Delay period

Ignition period

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

Tread

Bead

Shoulder

Side wall

16. In a ventilated disc brake

Disc contains many small holes for optimum cooling performance

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

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

Caliper is covered with cooling fins

17. 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

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

None of these

Brake effort

Tractive effort

Clutch effort

19. In bias ply tyres

Belts of steel mesh are used in the tyres

All plies run parallel to one another

All of the above

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

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

Anchor pin

Wheel rim or axle

Brake drum

Wheel piston or cylinder

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

8 : 1

10 : 1

7 : 1

9 : 1

22. The engine oil level should be checked

A few minutes after the ignition switch is turned off

While the engine is running

Immediately after the ignition switch is turned off

While the engine is running at high idle speed

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

Piston oil hole

Snap ring

Valve clearance

Valve recess

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

150% of the maximum engine torque

None of these

Equal to the maximum engine torque

80% of the maximum engine torque

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

Displacement and efficiency

Bore and length

Bore and stroke

Diameter and bore

26. The clutch is located between the transmission and the

Engine

Propeller shaft

Rear axle

Differential

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

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

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

28. The three basic cylinder arrangements for automotive engines are

Flat, radial, and V

In line, V, and opposed

V, double row, and opposed

In a row, in line, and opposed

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

Turns black

Become foamy

None of these

Appears milky

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

Gross vehicle width

Gross vehicle weight

Gross vehicle wheel base

Gross vehicle wheel track

Automobile Engineering Practice Set-3

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