Automobile Engineering Practice Set-1

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

Anemometer

Hydrometer

Hygrometer

Multimeter

2. The most commonly used power plant in automobiles is

I.C. engine

Gas turbine

Battery

None of these

3. The path taken by intake air is

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

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

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

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

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

Only fuel

Only air

None of these

Air and fuel

5. The negative plates of a lead acid battery has

Lead sulphate (PbSO₄)

Sulphuric acid (H₂SO₄)

Spongy lead (Pb)

Lead peroxide (PbO₂)

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

Gross vehicle weight (GVW)

Automatic transmission fluid (ATF)

Society of automotive engineers (SAE)

American petroleum institute (API)

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

H

C

I

L

8. 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

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

Incomplete combustion

High atmospheric temperature combustion

High temperature combustion

Low temperature combustion

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

Ampere hours

Weight

Amperes

Volts

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

Creates swirl

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

Increases the combustion temperature

Maintains a seal and prevents the fuel leakage

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

0.8

0.4

0.1

1.2

13. The stroke of an engine is the

Length of the connecting rod

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

Volume of the cylinder

Internal diameter of the cylinder

14. The brake warning light warns the driver of

Power brake failure

Water in the master cylinder

Air in the hydraulic system

Failure of the primary or secondary circuit of hydraulic system

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

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

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

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

Detonation

Ignition

Rumble

Pre-ignition

17. The main feature of Macpherson strut suspension is that

The vertical size of the suspension can be made more compact

The assembly is slightly more complicated in design

The unsprung mass in lighter

Non vertical external forces are supported by the suspension arms

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

Volatility

Ignition quality

Viscosity

Delay period

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

16

8

12

4

20. The vehicle ride will be comfortable if

Unsprung mass is kept minimum

Sprang mass is kept minimum

All of these

Vehicle mass is kept minimum

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

4R

4R²

R

2R

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

None of these

Lubrication performance

Resistance to wear

Cooling efficiency

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

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

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

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

Brake drags

Brake fades

Antilock braking system malfunctions

Vapour locking occurs in the brake lines

25. The calorific value of petrol is about

42.7-43.5 MJ/kg

36.5-38.5 MJ/kg

45.5-47 MJ/kg

39.4-42.5 MJ/kg

26. The octane rating of petrol commercially available is

100-110

85-95

110-125

95-100

27. The painting of automobiles is done to

Retain the characteristics of steel for long

All of these

Prevent rust from growing on the body

Improve its external appearance

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

Spline

Pivot

Sector gear

Tie rod

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

Less than 40 kmph

More than 60 kmph

Less than 60 kmph

Less than 20 kmph

30. The auto ignition in a spark ignition engine means

Ignition induced by the passage of a spark

Ignition of the charge before the passage of flame front

Automatic ignition of the charge at the end of compression

Ignition induced to supplement the process of normal combustion

Automobile Engineering Practice Set-1

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