Automobile Engineering Practice Set-1

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

American petroleum institute (API)

Society of automotive engineers (SAE)

Automatic transmission fluid (ATF)

Gross vehicle weight (GVW)

2. The brake warning light warns the driver of

Air in the hydraulic system

Power brake failure

Failure of the primary or secondary circuit of hydraulic system

Water in the master cylinder

3. The negative plates of a lead acid battery has

Lead sulphate (PbSO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

4. The stroke of an engine is the

Internal diameter of the cylinder

Volume of the cylinder

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

Length of the connecting rod

5. The main feature of Macpherson strut suspension is that

Non vertical external forces are supported by the suspension arms

The vertical size of the suspension can be made more compact

The assembly is slightly more complicated in design

The unsprung mass in lighter

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

4

16

8

12

7. The auto ignition in a spark ignition engine means

Automatic ignition of the charge at the end of compression

Ignition induced by the passage of a spark

Ignition of the charge before the passage of flame front

Ignition induced to supplement the process of normal combustion

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

Ignition

Rumble

Detonation

Pre-ignition

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

High temperature combustion

High atmospheric temperature combustion

Low temperature combustion

Incomplete combustion

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

1.2

0.1

0.4

0.8

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11. The calorific value of petrol is about

42.7-43.5 MJ/kg

45.5-47 MJ/kg

36.5-38.5 MJ/kg

39.4-42.5 MJ/kg

12. The octane rating of petrol commercially available is

100-110

95-100

85-95

110-125

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

Delay period

Viscosity

Ignition quality

Volatility

14. The path taken by intake air is

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

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

15. 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 the vibrations transferred from the surface of the road

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

None of the above

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

Resistance to wear

None of these

Lubrication performance

Cooling efficiency

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

Tie rod

Spline

Sector gear

Pivot

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

Hydrometer

Hygrometer

Anemometer

Multimeter

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

C

H

I

L

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

4R²

2R

4R

R

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21. The most commonly used power plant in automobiles is

Battery

Gas turbine

None of these

I.C. engine

22. The vehicle ride will be comfortable if

Sprang mass is kept minimum

Unsprung mass is kept minimum

Vehicle mass is kept minimum

All of these

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

None of these

Air and fuel

Only air

Only fuel

24. 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

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

Less than 20 kmph

Less than 60 kmph

More than 60 kmph

Less than 40 kmph

26. The painting of automobiles is done to

Prevent rust from growing on the body

Retain the characteristics of steel for long

Improve its external appearance

All of these

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

Amperes

Weight

Ampere hours

Volts

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

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

Increase the speed at which the valves move up and down

Make the crankshaft turn smoothly

29. In a square type engine

Stroke length and cylinder bore are same

Two cylinders are placed horizontal and two vertical

Geometrical shape is square

Diameter and length of piston are same

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

Vapour locking occurs in the brake lines

Brake drags

Antilock braking system malfunctions

Brake fades

Automobile Engineering Practice Set-1

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