Automobile Engineering Practice Set-5

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1. The ignition in a spark ignition engine takes place when the piston is

Leaving the T.D.C. position on its compression stroke

Approaching the T.D.C position on its exhaust stroke

Approaching the T.D.C. position on its compression stroke

Exactly at the T.D.C. position on its compression stroke

2. The included angle is the sum of the

Camber and S.A.I.

Castor and S.A.I.

Camber and castor

Camber and toe in

3. The best fuels for compression ignition engines are

Straight chain paraffin

Naphthalene

Branched chain paraffin

Aromatics

4. When the front wheels of a vehicle are locked during braking, then

Rear tyres skid across the road surface, and the vehicle spins around

Front tyres skid across the road surface, and the vehicle spins around

Driver loses control over the steering, and the vehicle continues moving in its current direction

Stopping distance becomes extremely long

5. Which of the following is not an automobile?

Truck

Motor cycle

Aeroplane

Passenger car

6. The tyre rotation is generally done at

1000 km

6000 km

4000 km

10,000 km

7. In which of the following conditions, the idle CO percentage should be measured with the vehicle?

Headlights are switched on

Headlights and other electrical devices are switched off

Headlights and other electrical devices are switched on

Headlights and other lights are switched off

8. The basic purpose of tyre rotation on automobiles is to

Avoid ply separation

Get better ride

None of these

Equalize wear

9. The most accurate ignition system of a spark ignition engine is

Magneto and electronic system

Electronic control unit system

Battery system

Magneto system

10. The order in which effort applied to the steering wheel is transferred to the front wheel is

Steering wheel, steering shaft, steering gearbox, steering knuckle, tie rod, front wheels

Steering wheel, steering gearbox, steering shaft, tie rod, steering knuckle, front wheels

Steering wheel, tie rod, steering gearbox, steering shaft, steering knuckle, front wheels

Steering wheel, steering shaft, steering gearbox, tie rod, steering knuckle, front wheels

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11. The function of a proportioning control valve (PCV) in a brake system is to

Reduce the brake fluid pressure when the brakes approach their lockup point

Cause less brake fluid pressure to act on the rear brakes than on the front brakes when the fluid pressure exceeds a predetermined level

Cause less brake fluid pressure to act on the front brakes than on the rear brakes when the fluid pressure exceeds a predetermined level

Ensure that equal pressure is supplied to the front and rear brakes throughout every braking operation

12. Caster is a

(A) Forward tilt of the kingpin

(B) Backward tilt of the kingpin

(D) None of these

13. A laminated glass upon cracking

Bursts into sharp edged fragments

Bursts into granular pieces

Sandwiched layer traps the fragments

Breaks into the form of crystals

14. A battery can be charged by

Adding distilled water

Adding sulphuric acid

Applying voltage in the reverse direction to that of charging

Applying a voltage in the same direction to that of charging

15. The rolling resistance is because of the friction between the

None of these

Tyre and the road surface

Wheel rim and road surface

Wheel rim and tyre

16. The function of an oil control orifice is that it

Removes impurities from cylinder head lubricating oil

Regulates the pressure of engine oil supplied by the oil pump for the lubrication of cylinder head mechanism and other purposes

Turns oil into fine mist for spray lubrication

Returns cylinder head lubricating oil to the oil pan at high speed

17. During suction stroke, the inside pressure of cylinder is

Less than the atmospheric pressure

Equal to the atmospheric pressure

More than the atmospheric pressure

None of these

18. Damper is also known as

Spring

Shock absorber

Radius rod

Torsion bar

19. A front stabilizer bar is used to

Control suspension movement and body roll

Provide a softer ride

Increase vehicle load carrying capacity

All of the above

20. The starting system includes

A battery, a starter, and an ignition switch

A battery, a distributor, and an ignition switch

A battery, a starter, and a distributor

A distributor, a starter, and an ignition switch

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21. When a gear box has four forward speeds and one reverse speed, it is said to be a

6-speed gear box

3-speed gear box

5-speed gear box

4-speed gear box

22. An oil filter bypass valve opens when the

Engine is cold

Oil filter becomes clogged

Engine runs at high speed

Engine overheats

23. The damper fluid leakage typically occur from

Coil spring mounting

Upper damper mounting

Clearance between inner and outer tubes of damper

Bottom of damper

24. The timing belt is attached to the camshaft pulley and

Distributor

Timing belt drive pulley

Radiator fan pulley

Alternator pulley

25. The fuel pump in the programmed fuel injection (PFI) system is located

In the fuel tank

On the distributor mounting in the engine compartment

On the engine compartment bulkhead

Between the fuel filler pipe and fuel tank

26. A three way catalytic converter

Reduces N₂, H₂O, and CO₂ emission levels

Re-circulates exhaust gases

Removes CO, HC, and NO₂ from the exhaust gases passing through it

Burns fuel vapour gases

27. The material generally used for cylinder sleeves is

Fibre reinforced plastic

Aluminium

Ceramic

Cast iron

28. The main characteristics of a maintenance free (MF) battery is that

A maintenance free battery has a relatively short shelf life when compared with standard batteries

Recharging of a maintenance free battery is neither required nor possible

Since it is sealed, the water in maintenance free battery is not lost through evaporation thus accordingly it is not necessary to top up the cells with water

A maintenance free battery requires little maintenance during normal use and it is sufficient to add water instead of an electrolyte containing sulphuric acid

29. An under-inflated tyre will wear the tread most

In the cross direction

In the lateral direction

Near the edges

Near the centre

30. Vulcanizing means

None of these

Spraying with special paint

Heating rubber under pressure

Melting rubber while stirring it

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31. The purpose of adding pigment to the paint is that it

Optimises the viscosity of paint

Makes paint film hard

None of the above

Gives colour and filling up effect to the paint

32. The lubrication oil flow in an engine is in the order as

Oil strainer, oil filter, relief valve, oil pump, cylinder block, cylinder head and oil pan

Oil strainer, oil pump, relief valve, oil filter, cylinder head, cylinder block and oil pan

Oil pump, oil strainer, relief valve, oil filter, cylinder block, cylinder head and oil pan

Oil strainer, oil pump, relief valve, oil filter, cylinder block, cylinder head and oil pan

33. Which of the following parameter can be adjusted by modifying the tie rod attachment length?

Steering gear ratio

Toe

Caster

Camber

34. The combustion process in a Diesel engine is a

Constant volume process

Constant temperature process

Constant pressure process

Adiabatic process

35. The materials used for cylinder block are

Steel and aluminium alloy

Cast iron and aluminium alloy

Brass and steel

Cast iron and steel

36. When turning a corner

The front wheels are toeing out

The inside front wheels has a greater angle than the outside wheel

All of the above

The front wheels are turning on different angles

37. The mechanical efficiency (ηm) of an I.C. engine is equal to (where I.P. = Indicated power, B.P. = Brake power and F.P. = Frictional power)

B.P/F.P.

B.P/I.P.

F.P/B.P.

I.P/B.P.

38. Instead of valves, the ports are used in case of

V6 engines

Four stroke I.C. engines

Two stroke I.C. engines

None of these

39. The main function of a resonator is that it

Regulates the intake air flow rate

Enhances intake efficiency

Regulates the intake air temperature

Reduces the intake air noise

40. The purpose of a cylinder head gasket is to

Prevent engine oil from going into combustion chamber

Removes impurities from cylinder head lubricating oil

Prevent the combustion gases from leaking from the joint between the cylinder block and the cylinder head

None of the above

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41. The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

Enable the pump's fault diagnosis function to operate

Supplies a large amount of fuel and thereby creates a choke effect

Pressurise the fuel system before the engine is started

Warm up and lubricate the pump

Automobile Engineering Practice Set-5

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