Automobile Engineering MCQs Archives

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

it makes petrol engines lighter

higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition

less compression ratio gives better performance

it is just customary to have less compression ratio in petrol engines

✅ The correct answer is option B.

292. The co-efficient of rolling resistance for a truck weighing 63 500 N is 0.018. The rolling resistance to the truck is

1.143 N

11.43 N

114.3 N

1143 N

✅ The correct answer is option D.

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

brake effort

tractive effort

clutch effort

none of these

✅ The correct answer is option B.

294. In a spark plug, when the temperature of the central electrode exceeds a certain temperature, any carbon that has adhered will be burnt off, and the temperature at which this burning off carbon starts is referred to as the self cleaning temperature.

Correct

Incorrect

✅ The correct answer is option A.

295. In radial tyres

one ply layer runs diagonally one way and another layer runs diagonally the other way

all plies run parallel to one another and vertical to tyre bead

inner tubes are always used

none of these

✅ The correct answer is option B.

296. The advantage of double-wishbone suspension design is that a large amount of freedom is available for setting geometry and precise settings can be made for driving comfort and steerability,

Correct

Incorrect

✅ The correct answer is option A.

297. The component that connects the steering rack to the knuckles is

tie-rod

sector gear

pivot

spline

✅ The correct answer is option A.

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

200 bar

220 bar

250 bar

300 bar

✅ The correct answer is option A.

299. It is necessary to maintain the valve clearances as they

reduce the resistance to sliding that occurs between the cam and the tappet

allow for lengthening of the valves owing to the heat of combustion

increase the speed at which the valves move up and down

make the crankshaft turn smoothly

✅ The correct answer is option B.

300. If the air-fuel mixture in a spark ignition engine is too rich, then air-fuel ratio is about

17:01

15:01

13:01

10:01

✅ The correct answer is option D.