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Current Affairs January 2024

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4

The Diesel engines are also known as

A. Spark ignition (S.I.) engines

B. Compression ignition (C.I.) engines

C. Steam engines

D. None of these

Correct Answer :

B. Compression ignition (C.I.) engines


Related Questions

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4

The purpose of a cylinder head gasket is to

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

B. Prevent engine oil from going into combustion chamber

C. Removes impurities from cylinder head lubricating oil

D. None of the above

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4

The main task of a battery in automobiles is to

A. Supply electricity to the alternator

B. Act as a reservoir or stabilizer of electricity

C. Supply electricity to the vehicle's electrical system at all times while the engine is running

D. Supply a large amount of power to turn the starter motor when the engine is being started

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4

If clearance volume of I.C. engines is increased, the compression ratio will

A. Increase

B. Decrease

C. Remain constant

D. Be doubled

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4

The function of an oil control orifice is that it

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

B. Turns oil into fine mist for spray lubrication

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

D. Removes impurities from cylinder head lubricating oil

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4

The driveshafts are connected to the differential and wheel hubs through universal joints because the universal joints

A. Absorb the vibrations transferred from the surface of the road

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

C. Absorb any difference in speed between the left and right wheels when the vehicle is turning

D. None of the above

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4

The aspect ratio (expressed in percentage) of the tyre is defined as the ratio of

A. Section width to section height

B. Section height to section width

C. Wheel diameter to section height

D. Wheel diameter to section width

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4

In a four stroke engine for each crankshaft revolution, the camshaft revolves

A. One half turn

B. One turn

C. Two turns

D. Four turns

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4

Two speed reverse gear arrangements is generally provided in case of

A. Passenger cars

B. Matadors

C. Tractors

D. Trucks

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4

The connecting rod is attached to the piston by the

A. Cap bolt

B. Piston pin

C. Cap roller bearing

D. Rod cap

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4

The crescent shaped cavity on the piston head top surface is called as

A. Piston oil hole

B. Snap ring

C. Valve recess

D. Valve clearance

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4

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)

A. I.P/B.P.

B. B.P/I.P.

C. B.P/F.P.

D. F.P/B.P.

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4

The main function of an exhaust muffler is the

A. Optimisation of exhaust efficiency

B. Reduction of exhaust noise

C. Reduction of nitrogen oxide in the exhaust gases

D. Reduction of the exhaust gas volume

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4

The aluminium alloy is used in cylinder blocks because

A. It is lighter and has good heat dissipation characteristics

B. Material cost is low

C. It does not require any cylinder liners

D. The piston is also made of aluminium alloy

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4

The torque available at the contact between driving wheels and road is known as

A. Brake effort

B. Tractive effort

C. Clutch effort

D. None of these

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4

The component in the radiator of an automobile that increases the boiling point of water is

A. Drain plug

B. Water jacket

C. Vacuum valve

D. Pressure cap

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4

Which of the following indicates multigrade oil?

A. SAE 30

B. API SF

C. SAE 20 W50

D. API 50

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4

Tachometer in a vehicle measures

A. Speed

B. Distance

C. Engine r.p.m.

D. Fuel consumption

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4

The function of a governor in automobiles is to

A. Limit the power

B. Limit the vehicle speed

C. Maintain constant engine speed

D. Maximise the fuel economy

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4

The indicated power of a four stroke engine (in watts) is equal to (where P = Mean effective pressure in N/m², L = Length of stroke in metres, A = Cross-sectional area of the piston in m², and N = Speed of the engine in revolutions per second (r.p.s)

A. P.L.A.N/2

B. P.L.A.N

C. 2 × P.L.A.N

D. P.L.A.N/4

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4

The basic function of the suspension is to

A. Absorbs vibration and impact forces from the road surface

B. Ensure that the steering wheel can deliver a suitable amount of steering force

C. Ensure that wheel alignment is not disturbed during driving

D. Automatically correct the effects of over steering

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4

The brake warning light warns the driver of

A. Water in the master cylinder

B. Air in the hydraulic system

C. Failure of the primary or secondary circuit of hydraulic system

D. Power brake failure

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4

The main function of a resonator is that it

A. Regulates the intake air flow rate

B. Reduces the intake air noise

C. Enhances intake efficiency

D. Regulates the intake air temperature

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4

The main feature of Macpherson strut suspension is that

A. The vertical size of the suspension can be made more compact

B. Non vertical external forces are supported by the suspension arms

C. The unsprung mass in lighter

D. The assembly is slightly more complicated in design

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4

The most commonly used supplementary restraint system (SRS) component is

A. Seat belt

B. Brake

C. Airbag

D. Steering

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4

The maximum torque multiplication ratio in a torque converter is about

A. 2.5

B. 10

C. 25

D. 40

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4

In a ventilated disc brake

A. A duct directs air towards the caliper for cooling while the vehicle is moving

B. Caliper is covered with cooling fins

C. Disc contains many small holes for optimum cooling performance

D. Disc contains radial vanes between its rubbing surfaces for optimum cooling performance

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4

Which of the following is not an automobile?

A. Motor cycle

B. Passenger car

C. Aeroplane

D. Truck

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4

The device for smoothening out the power impulses from the engine is called

A. Clutch

B. Differential

C. Flywheel

D. Torque converter

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4

The heat transfer from coolant to air in the radiator of an automobile engine takes place by

A. Radiation only

B. Convention only

C. Convection and radiation

D. Conduction, convection and radiation

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4

An underinflated tyre will wear the tread most

A. Near the centre

B. Near the edges

C. In the lateral direction

D. In the cross direction