Home
Current Affairs January 2024

What is the correct answer?

4

The compression ratio in petrol engine is kept less than in Diesel engine because

A. It makes petrol engines lighter

B. Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

C. Less compression ratio gives better performance

D. It is just customary to have less compression ratio in petrol engines

Correct Answer :

B. Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition


Related Questions

What is the correct answer?

4

The purpose of turning radius gauges is to measure the

A. Contact areas of the tyres

B. Free plays of the steering wheel

C. Turning radius of the left and right wheels

D. Difference in the toe angles of the left and right wheels

What is the correct answer?

4

The natural gas is compressed in a CNG cylinder at a pressure of

A. 200 bar

B. 220 bar

C. 250 bar

D. 300 bar

What is the correct answer?

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.

What is the correct answer?

4

The battery is an electrochemical device, which means battery

A. Makes chemicals by mechanical means

B. Uses chemical action to provide electricity

C. Has curved plates instead of flat plates

D. Does not use an electrolyte

What is the correct answer?

4

The specific gravity of petrol is about

A. 0.75

B. 0.85

C. 0.95

D. 1.25

What is the correct answer?

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

What is the correct answer?

4

A petrol engine of a car develops 125 Nm torque at 2700 r.p.m. The car is driven in second gear having gear ratio of 1.75. The final drive ratio is 4.11. If the overall transmission efficiency is 90%, then the torque available at the driving wheels is

A. 8.091 Nm

B. 80.91 Nm

C. 809.1 Nm

D. 8091 Nm

What is the correct answer?

4

A basic difference between the spark ignition engine and the Diesel engine is that the

A. Diesel engine compresses air alone instead of an air-fuel mixture

B. Air temperature ignites the fuel in the Diesel engine

C. Fuel is sprayed into the combustion chamber in the Diesel engine as the piston nears T.D.C. on the compression stroke

D. All of the above

What is the correct answer?

4

An engine has a clearance volume of 100 cm³ and a swept volume of 800 cm³. The compression ratio is

A. 7 : 1

B. 8 : 1

C. 9 : 1

D. 10 : 1

What is the correct answer?

4

The component that connects the steering rack to the knuckles is

A. Tie rod

B. Sector gear

C. Pivot

D. Spline

What is the correct answer?

4

The advantage of a tubeless tyre over tube type tyre is

A. Slow air leakage

B. Better fuel efficiency

C. Less chances of running flat

D. All of these

What is the correct answer?

4

In aluminium cylinder blocks, the cylinder liners are made of

A. Aluminium

B. Ceramic

C. Brass

D. Cast iron

What is the correct answer?

4

The effect of having excess camber is

A. Excessive steering alignment torque

B. Hard steering

C. Too much traction

D. Uneven tyre wear

What is the correct answer?

4

Damper in an automobile is used to

A. Absorb the energy

B. Dissipate the energy

C. Release the energy

D. Increase the energy

What is the correct answer?

4

Two speed reverse gear arrangements is generally provided in case of

A. Passenger cars

B. Matadors

C. Tractors

D. Trucks

What is the correct answer?

4

The cetane number of a Diesel fuel is a measure of

A. Volatility

B. Viscosity

C. Ignition quality

D. Delay period

What is the correct answer?

4

The main merit of a multi cylinder type cylinder sleeve is

A. Smaller engine dimensions

B. Better cooling efficiency

C. High rigidity

D. None of these

What is the correct answer?

4

Which of the following indicates multigrade oil?

A. SAE 30

B. API SF

C. SAE 20 W50

D. API 50

What is the correct answer?

4

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

A. Cooling efficiency

B. Resistance to wear

C. Lubrication performance

D. None of these

What is the correct answer?

4

The tilting of the front wheels away from the vertical, when viewed from the front of the car, is called

A. Camber

B. Caster

C. Toe in

D. Toe out

What is the correct answer?

4

The ignition coil is used to

A. Step up current

B. Step down current

C. Step up voltage

D. Step down voltage

What is the correct answer?

4

Highest useful compression ratio (HUCR) is the highest compression ratio at which the

A. Engine can run

B. Engine gives maximum output

C. Engine is most efficient

D. Fuel can be used in a test engine without knocking

What is the correct answer?

4

Which of the following symptom is caused as a result of brake disc run out?

A. Ineffectiveness of the brakes

B. Judder during braking

C. Localized wearing of the brake pads

D. Rapid wearing of the brake pads

What is the correct answer?

4

The number of exhaust manifolds in a V6 engine is

A. One

B. Two

C. Four

D. Eight

What is the correct answer?

4

In a petrol engine, the high voltage for spark plug is in the order of

A. 1000 volts

B. 2000 volts

C. 11 kilovolts

D. 22 kilovolts

What is the correct answer?

4

The temperature at which tyre inflation pressure should be checked is

A. 20°C

B. 25°C

C. 35°C

D. Ambient temperature

What is the correct answer?

4

A laminated glass upon cracking

A. Bursts into sharp edged fragments

B. Bursts into granular pieces

C. Sandwiched layer traps the fragments

D. Breaks into the form of crystals

What is the correct answer?

4

An oil filter bypass valve opens when the

A. Engine is cold

B. Engine overheats

C. Oil filter becomes clogged

D. Engine runs at high speed

What is the correct answer?

4

Which one of the following statement correctly describes the construction of a bevel gear type differential?

A. The drive shafts are splined to the differential carrier.

B. The left side gear and the differential carrier rotate in constant unison.

C. The differential carrier houses differential pinion gears and side gears; each pinion gear meshes with a different side gear.

D. The differential carrier houses differential pinion gears and side gears

What is the correct answer?

4

The tyre rotation is generally done at

A. 1000 km

B. 4000 km

C. 6000 km

D. 10000 km