Automobile Engineering Practice Set-1

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1. The engine oil viscosity is defined by ___________ ratings.

Gross vehicle weight (GVW)

Automatic transmission fluid (ATF)

American petroleum institute (API)

Society of automotive engineers (SAE)

2. The coefficient of friction for the clutch facing is approximately

1.2

0.8

0.1

0.4

3. The auto ignition in a spark ignition engine means

Ignition induced by the passage of a spark

Ignition induced to supplement the process of normal combustion

Ignition of the charge before the passage of flame front

Automatic ignition of the charge at the end of compression

4. The most commonly used power plant in automobiles is

Gas turbine

I.C. engine

None of these

Battery

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

Hydrometer

Anemometer

Multimeter

Hygrometer

6. The braking control type traction control system (TCS) generally operates in the speed range of

Less than 40 kmph

Less than 20 kmph

More than 60 kmph

Less than 60 kmph

7. The calorific value of petrol is about

42.7-43.5 MJ/kg

39.4-42.5 MJ/kg

36.5-38.5 MJ/kg

45.5-47 MJ/kg

8. 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 carburettor (or throttle body) intake manifold intake ports cylinders

Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders

9. The characteristic that is enhanced by the honing of cylinder sleeves inner surface is

None of these

Cooling efficiency

Resistance to wear

Lubrication performance

10. The brake warning light warns the driver of

Water in the master cylinder

Failure of the primary or secondary circuit of hydraulic system

Air in the hydraulic system

Power brake failure

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11. The capacity of a battery is usually expressed in terms of

Volts

Amperes

Ampere hours

Weight

12. In petrol engines, during suction stroke, _________ is drawn in the cylinder

None of these

Only fuel

Only air

Air and fuel

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

Ignition

Detonation

Rumble

Pre-ignition

14. In a square type engine

Diameter and length of piston are same

Geometrical shape is square

Two cylinders are placed horizontal and two vertical

Stroke length and cylinder bore are same

15. It is necessary to maintain the valve clearances as they

Make the crankshaft turn smoothly

Increase the speed at which the valves move up and down

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

16. The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.

Absorb any difference in speed between the left and right wheels when the vehicle is turning

None of the above

Absorb the vibrations transferred from the surface of the road

17. The vehicle ride will be comfortable if

Sprang mass is kept minimum

Vehicle mass is kept minimum

All of these

Unsprung mass is kept minimum

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

Antilock braking system malfunctions

Brake fades

Vapour locking occurs in the brake lines

Brake drags

19. The cetane number of a Diesel fuel is a measure of

Viscosity

Delay period

Volatility

Ignition quality

20. The crankshaft of a typical inline four cylinder engine has ________ balance weights.

16

4

8

12

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21. The octane rating of petrol commercially available is

110-125

85-95

95-100

100-110

22. The function of a first compression ring (top ring) is that it

Creates swirl

Maintains a seal and prevents the fuel leakage

Increases the combustion temperature

Maintains a seal and prevents escape of burned gases and loss of pressure in the combustion chamber

23. The stroke of an engine is the

Length of the connecting rod

Internal diameter of the cylinder

Volume of the cylinder

Distance between T.D.C. and B.D.C.

24. The negative plates of a lead acid battery has

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

Spongy lead (Pb)

25. The air resistance to a car at 20 kmph is R. The air resistance at 40 kmph will be

4R

4R²

2R

R

26. The condition that results in large quantities of HC emission is

High temperature combustion

Low temperature combustion

Incomplete combustion

High atmospheric temperature combustion

27. The connecting rods are generally made of __________ shaped cross-section.

L

C

H

I

28. The main feature of Macpherson strut suspension is that

The assembly is slightly more complicated in design

The unsprung mass in lighter

The vertical size of the suspension can be made more compact

Non vertical external forces are supported by the suspension arms

29. The painting of automobiles is done to

Retain the characteristics of steel for long

Improve its external appearance

All of these

Prevent rust from growing on the body

30. The component that connects the steering rack to the knuckles is

Tie rod

Sector gear

Pivot

Spline

Automobile Engineering Practice Set-1

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