Automobile Engineering Practice Set-1

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1. The painting of automobiles is done to

Prevent rust from growing on the body

All of these

Retain the characteristics of steel for long

Improve its external appearance

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

Detonation

Rumble

Ignition

Pre-ignition

3. The negative plates of a lead acid battery has

Lead peroxide (PbO₂)

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

4. The auto ignition in a spark ignition engine means

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

Ignition induced by the passage of a spark

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

Resistance to wear

Cooling efficiency

Lubrication performance

None of these

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

Tie rod

Spline

Pivot

Sector gear

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

Increases the combustion temperature

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

Maintains a seal and prevents the fuel leakage

Creates swirl

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

4R

4R²

2R

R

9. 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

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

Viscosity

Volatility

Delay period

Ignition quality

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11. The most commonly used power plant in automobiles is

None of these

Battery

I.C. engine

Gas turbine

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

16

12

8

4

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

None of the above

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

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

14. 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 manifold intake ports cylinders

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

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

15. In a square type engine

Two cylinders are placed horizontal and two vertical

Geometrical shape is square

Stroke length and cylinder bore are same

Diameter and length of piston are same

16. The octane rating of petrol commercially available is

100-110

110-125

95-100

85-95

17. The vehicle ride will be comfortable if

All of these

Unsprung mass is kept minimum

Sprang mass is kept minimum

Vehicle mass is kept minimum

18. The calorific value of petrol is about

45.5-47 MJ/kg

42.7-43.5 MJ/kg

39.4-42.5 MJ/kg

36.5-38.5 MJ/kg

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

Society of automotive engineers (SAE)

Gross vehicle weight (GVW)

Automatic transmission fluid (ATF)

American petroleum institute (API)

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

I

C

H

L

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21. 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

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

Incomplete combustion

High temperature combustion

Low temperature combustion

High atmospheric temperature combustion

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

Only fuel

Only air

None of these

Air and fuel

24. The brake warning light warns the driver of

Air in the hydraulic system

Power brake failure

Water in the master cylinder

Failure of the primary or secondary circuit of hydraulic system

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

Reduce the resistance to sliding that occurs between the cam and the tappet

Increase the speed at which the valves move up and down

Make the crankshaft turn smoothly

Allow for lengthening of the valves owing to the heat of combustion

26. The main feature of Macpherson strut suspension is that

Non vertical external forces are supported by the suspension arms

The unsprung mass in lighter

The vertical size of the suspension can be made more compact

The assembly is slightly more complicated in design

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

Hygrometer

Hydrometer

Multimeter

Anemometer

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

Amperes

Volts

Ampere hours

Weight

29. The stroke of an engine is the

Internal diameter of the cylinder

Length of the connecting rod

Volume of the cylinder

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

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

1.2

0.4

0.1

0.8

Automobile Engineering Practice Set-1

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