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Automobile Engineering MCQs
0

Automobile Engineering Practice Set-1

May 2, 2021

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Page 1 of 3

1. The calorific value of petrol is about

39.4-42.5 MJ/kg

36.5-38.5 MJ/kg

45.5-47 MJ/kg

42.7-43.5 MJ/kg

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

Vapour locking occurs in the brake lines

Brake fades

Brake drags

Antilock braking system malfunctions

3. 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

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

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

Increase the speed at which the valves move up and down

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

Make the crankshaft turn smoothly

5. The main feature of Macpherson strut suspension is that

The vertical size of the suspension can be made more compact

Non vertical external forces are supported by the suspension arms

The unsprung mass in lighter

The assembly is slightly more complicated in design

6. The negative plates of a lead acid battery has

Spongy lead (Pb)

Sulphuric acid (H₂SO₄)

Lead sulphate (PbSO₄)

Lead peroxide (PbO₂)

7. 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

Increases the combustion temperature

Maintains a seal and prevents the fuel leakage

Creates swirl

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

0.1

0.8

0.4

1.2

9. In a square type engine

Diameter and length of piston are same

Stroke length and cylinder bore are same

Two cylinders are placed horizontal and two vertical

Geometrical shape is square

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

4

12

8

16

Page 2 of 3

11. The vehicle ride will be comfortable if

Sprang mass is kept minimum

All of these

Unsprung mass is kept minimum

Vehicle mass is kept minimum

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

Ampere hours

Weight

Amperes

Volts

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

Hygrometer

Hydrometer

Anemometer

Multimeter

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

Viscosity

Volatility

Delay period

Ignition quality

15. The stroke of an engine is the

Length of the connecting rod

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

Internal diameter of the cylinder

Volume of the cylinder

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

Cooling efficiency

Lubrication performance

None of these

Resistance to wear

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

More than 60 kmph

Less than 20 kmph

Less than 40 kmph

Less than 60 kmph

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

Incomplete combustion

High atmospheric temperature combustion

High temperature combustion

Low temperature combustion

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

L

H

I

C

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

Pre-ignition

Detonation

Ignition

Rumble

Page 3 of 3

21. 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 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

None of the above

22. The octane rating of petrol commercially available is

100-110

95-100

110-125

85-95

23. The brake warning light warns the driver of

Air in the hydraulic system

Water in the master cylinder

Failure of the primary or secondary circuit of hydraulic system

Power brake failure

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

Only air

None of these

Only fuel

Air and fuel

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

4R

R

2R

4R²

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

Gross vehicle weight (GVW)

American petroleum institute (API)

Automatic transmission fluid (ATF)

Society of automotive engineers (SAE)

27. 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

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

Pivot

Spline

Tie rod

Sector gear

29. The most commonly used power plant in automobiles is

Battery

I.C. engine

Gas turbine

None of these

30. 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 ports intake manifold cylinders

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

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

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VideRime

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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