Automobile Engineering Practice Set-8

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1. In a Diesel engine, the fuel is ignited by

None of these

The hot exhaust

The heat of compression

An electric spark

2. The oil pump is driven by the

Crankshaft via drive belt

Camshaft

Alternator shaft

Crankshaft directly

3. The rating of C.I. engine fuel (Diesel) is given by

Cetane number

Octane number

Performance number

None of these

4. The condition that causes vapour locking in a brake system is

Keeping the vehicle without use for an extended period

Overcooling of the brakes during high speed driving

Overheating of the fluid due to frequent brake application

An excessively high engine speed on a downhill road

5. What type of bearing is used for main bearings and connecting rod bearings?

Taper roller bearing

Plain bearings

Ball bearings

Needle roller bearing

6. The coefficient of rolling resistance for a truck weighing 63,500 N is 0.018. The rolling resistance to the truck is

1143 N

1.143 N

114.3 N

11.43 N

7. The main cause for the change in engine oil viscosity is

Contamination

Temperature

Humidity

Vibration

8. The camshaft of a four stroke Diesel engine running at 1000 rpm will run at

2000 rpm

4000 rpm

500 rpm

1000 rpm

9. Which one of the following statements correctly describes the construction of a planetary gear type differential?

The internal gear is fixed to the planetary gear.

One drive shaft is splined to the central gear and the other to the planetary gear.

The six planetary pinions rotate in constant mesh with the internal gears.

Each planetary pinion gear meshes with both the central gear and the internal gear.

10. A maintenance free battery

Does not contain acid

Has lead-calcium plate grid

Does not contain water

Has lead-antimony plate grid

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11. Which of the following is not a part of the chassis?

Wheels

Front axle

Seats

Steering system

12. In an engine, the temperature of the piston will be more at the

Piston walls

Skirt of the piston

Crown of the piston

Piston rings

13. The Diesel engines as compared to petrol engines require

No flywheel

Bigger flywheel

Same size of flywheel

Smaller flywheel

14. The condition that results in large quantities of CO emission is

Insufficient fuel during combustion

Insufficient air during combustion

High temperature combustion

Low temperature combustion

15. The sequence order of events in a four stroke engine is

Suction compression power exhaust

Exhaust compression power suction

Suction power compression exhaust

Suction exhaust power compression

16. The crankcase dilution means

Dilution of oil by water in the crankcase

Dilution of mixture passing through crankcase in two stroke engines

Dilution of lubrication oil by fuel in the crankcase

Dilution of fuel in the crankcase

17. In a four wheel drive (4WD), the numbers of gear boxes are

4

2

3

1

18. The operation of removing trapped air from the hydraulic braking system is known as

Cleaning

Bleeding

Trapping

Tapping

19. The function of anti-lock brake system (ABS) is that is

Minimizes the brake fade

Maintains directional control during braking by preventing the wheels from locking

Prevents nose dives during braking and thereby postpones locking of the wheels

Reduces the stopping distance

20. Valve overlap is the number of degrees of camshaft rotation during which

(d) None of these

(b) Both valves are open

(a) Both valves are closed

(c) Both 'A' and 'B'

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21. The component that is responsible for converting the rotation of the steering wheel into lateral motion is the

Steering wheel

Tie rod

Steering shaft

Steering gearbox

22. In a four cylinder inline engine, the number of firing strokes in one revolution of the crank is

2

4

3

1

23. The engine oil is stored in _________ when the engine is not running.

Oil pump

Separate oil tank

Cylinder head

Oil pan

Automobile Engineering Practice Set-8

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Automobile Engineering Practice Set-8

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