Automobile Engineering Practice Set-1

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1. The vehicle ride will be comfortable if

Unsprung mass is kept minimum

Vehicle mass is kept minimum

Sprang mass is kept minimum

All of these

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

Rumble

Detonation

Ignition

Pre-ignition

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

American petroleum institute (API)

Society of automotive engineers (SAE)

Gross vehicle weight (GVW)

Automatic transmission fluid (ATF)

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

Only air

None of these

Air and fuel

Only fuel

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

L

I

H

C

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

Lubrication performance

Cooling efficiency

None of these

Resistance to wear

7. 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

8. The most commonly used power plant in automobiles is

None of these

I.C. engine

Battery

Gas turbine

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

None of the above

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

Absorb the vibrations transferred from the surface of the road

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

Vapour locking occurs in the brake lines

Brake fades

Antilock braking system malfunctions

Brake drags

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11. The path taken by intake air is

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

Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders

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

1.2

0.1

0.4

0.8

13. 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.

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

Less than 60 kmph

More than 60 kmph

Less than 20 kmph

Less than 40 kmph

15. 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

Make the crankshaft turn smoothly

Increase the speed at which the valves move up and down

16. The main feature of Macpherson strut suspension is that

The unsprung mass in lighter

The assembly is slightly more complicated in design

The vertical size of the suspension can be made more compact

Non vertical external forces are supported by the suspension arms

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

12

4

16

8

18. The calorific value of petrol is about

36.5-38.5 MJ/kg

42.7-43.5 MJ/kg

39.4-42.5 MJ/kg

45.5-47 MJ/kg

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

4R

R

4R²

2R

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

Volatility

Ignition quality

Viscosity

Delay period

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

Weight

Volts

Amperes

Ampere hours

22. The octane rating of petrol commercially available is

100-110

110-125

85-95

95-100

23. The auto ignition in a spark ignition engine means

Ignition induced to supplement the process of normal combustion

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

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

Multimeter

Anemometer

Hygrometer

Hydrometer

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

Pivot

Tie rod

Spline

Sector gear

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

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

Creates swirl

Increases the combustion temperature

Maintains a seal and prevents the fuel leakage

27. In a square type engine

Stroke length and cylinder bore are same

Geometrical shape is square

Two cylinders are placed horizontal and two vertical

Diameter and length of piston are same

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

Low temperature combustion

High atmospheric temperature combustion

Incomplete combustion

High temperature combustion

29. The negative plates of a lead acid battery has

Lead peroxide (PbO₂)

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

30. The painting of automobiles is done to

Improve its external appearance

Retain the characteristics of steel for long

All of these

Prevent rust from growing on the body

Automobile Engineering Practice Set-1

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