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Current Affairs January 2024

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4

The process of removing the burnt gases from the engine cylinder by the fresh charge coming into the engine cylinder from the crankcase, is known as

A. Cleaning

B. Priming

C. Scavenging

D. Detonation

Correct Answer :

C. Scavenging


Related Questions

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4

In comparison with a radial tyre, one advantage of a bias ply tyre is

A. Longer life

B. Lower rolling resistance

C. Smoother ride at low speeds

D. None of these

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4

The main purpose of an engine's air cleaner is that it

A. Controls the engine's air intake volume

B. Reduces the engine's air intake noise

C. Prevents rain water from entering the engine

D. Prevents dust and other foreign matter from entering the engine

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4

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

A. Headlights and other electrical devices are switched off

B. Headlights and other electrical devices are switched on

C. Headlights and other lights are switched off

D. Headlights are switched on

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4

Bead wires are made of

A. Steel

B. Copper

C. Zinc

D. Aluminium

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4

The purpose of transmission in an automobile is

A. To vary the speed of automobile

B. To vary the torque at the wheels

C. To vary the power of automobile

D. None of these

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4

In Diesel engines, during suction stroke, ________ is drawn in the cylinder.

A. Air and fuel

B. Only fuel

C. Only air

D. None of these

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4

Which of the following oil is more viscous?

A. SAE 30

B. SAE 40

C. SAE 70

D. SAE 80

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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 maximum torque multiplication ratio in a torque converter is about

A. 2.5

B. 10

C. 25

D. 40

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4

The condition that results in large quantities of HC emission is

A. High temperature combustion

B. Incomplete combustion

C. Low temperature combustion

D. High atmospheric temperature combustion

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4

The caster is called positive when the top of the king pin is inclined to the

A. Rear of the vehicle

B. Front of the vehicle

C. Left of the vehicle

D. Right of the vehicle

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4

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

A. Trapping

B. Tapping

C. Bleeding

D. Cleaning

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4

The self ignition temperature of Diesel as compared to petrol is

A. Higher

B. Lower

C. Same

D. Depends on fuel quality

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4

The advantage of having a tandem master cylinder arrangement in automobiles is that it

A. Enhances safety by serving two independent lines in a divided line brake circuit

B. Enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss

C. Supplies equal fluid pressure to each line of a divided line brake circuit, thereby preventing the brakes from dragging on one side

D. Boosts the brake fluid pressure to reduce the force required to depress the brake pedal

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4

The compression ratio of a petrol engine is nearly

A. 4 : 1

B. 8 : 1

C. 15 : 1

D. 20 : 1

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4

The connecting rod connects the piston and the

A. Cylinder head

B. Cylinder block

C. Camshaft

D. Crankshaft

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4

A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

A. Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion

B. Allows the steering wheel to be turned by a greater amount when steering

C. Makes the steering more responsive

D. Reduces the amount of kickback for large steering angles

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4

The Diesel engines as compared to petrol engines require

A. Bigger flywheel

B. Smaller flywheel

C. Same size of flywheel

D. No flywheel

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4

A heat treated glass generally used in automobiles bursts into ________ upon cracking,

A. Sharp edged fragments

B. Small particles

C. Large particles

D. None of these

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4

The composition of the electrolyte in a fully charged battery is that

A. The electrolyte is pure distilled water

B. The electrolyte is pure sulphuric acid

C. The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight

D. The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight

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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 calorific value of Diesel is about

A. 36.5 MJ/kg

B. 38.5 MJ/kg

C. 42.5 MJ/kg

D. 45.5 MJ/kg

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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

The cetane number of a Diesel fuel is a measure of

A. Volatility

B. Viscosity

C. Ignition quality

D. Delay period

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4

A clutch is usually designed to transmit maximum torque which is

A. Equal to the maximum engine torque

B. 80 % of the maximum engine torque

C. 150 % of the maximum engine torque

D. None of these

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4

It is necessary to maintain the valve clearances as they

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

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

C. Increase the speed at which the valves move up and down

D. Make the crankshaft turn smoothly

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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 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 seat belt tensioners are built in the

A. Front seats

B. Shoulder anchors

C. Seat belt retractors

D. Seat belt buckles

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4

The connecting rods are generally made of ________ shaped crosssection.

A. I

B. C

C. L

D. H