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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-1

May 2, 2021

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

Brake drags

Vapour locking occurs in the brake lines

Brake fades

Antilock braking system malfunctions

2. The main feature of Macpherson strut suspension is that

The assembly is slightly more complicated in design

The unsprung mass in lighter

Non vertical external forces are supported by the suspension arms

The vertical size of the suspension can be made more compact

3. 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

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

More than 60 kmph

Less than 60 kmph

Less than 40 kmph

Less than 20 kmph

5. The negative plates of a lead acid battery has

Spongy lead (Pb)

Lead peroxide (PbO₂)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

6. 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 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

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

Weight

Volts

Amperes

Ampere hours

8. The path taken by intake air is

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

Air cleaner carburettor (or throttle body) intake manifold 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

9. The most commonly used power plant in automobiles is

Battery

I.C. engine

Gas turbine

None of these

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

Delay period

Volatility

Viscosity

Ignition quality

Page 2 of 3

11. In a square type engine

Diameter and length of piston are same

Stroke length and cylinder bore are same

Geometrical shape is square

Two cylinders are placed horizontal and two vertical

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

Cooling efficiency

None of these

Lubrication performance

Resistance to wear

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

Maintains a seal and prevents the fuel leakage

Creates swirl

Increases the combustion temperature

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

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

C

I

L

H

15. The vehicle ride will be comfortable if

Vehicle mass is kept minimum

Unsprung mass is kept minimum

Sprang mass is kept minimum

All of these

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

4R²

4R

2R

R

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

Low temperature combustion

Incomplete combustion

High atmospheric temperature combustion

High temperature combustion

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

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

Make the crankshaft turn smoothly

19. The painting of automobiles is done to

Improve its external appearance

Prevent rust from growing on the body

Retain the characteristics of steel for long

All of these

20. 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

Page 3 of 3

21. 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

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

0.8

0.1

1.2

0.4

23. 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)

24. The octane rating of petrol commercially available is

110-125

85-95

95-100

100-110

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

Pivot

Spline

Sector gear

Tie rod

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

Air and fuel

None of these

Only air

Only fuel

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

4

16

12

8

28. The brake warning light warns the driver of

Failure of the primary or secondary circuit of hydraulic system

Water in the master cylinder

Air in the hydraulic system

Power brake failure

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

Hygrometer

Multimeter

Anemometer

Hydrometer

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

Ignition

Rumble

Detonation

Pre-ignition

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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