56) The delay period in compression ignition engines depends upon

temperature and pressure in the cylinder at the time of injection

nature of the fuel mixture strength

relative velocity between the fuel injection and air turbulence pressure of residual gases

all of the above

Answer is:

all of the above

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57) Lubrication in I.C. engines dissipates the heat generated from the moving parts due to friction.

Right

Wrong

Answer is:

Right

58) The ratio of the heat equivalent to one kW hour to the heat in fuel per B.P. hour is termed as brake thermal efficiency.

Yes

Unknown

None

Answer is:

Yes

59) The theoretically correct mixture of air and petrol is

10:1

15:1

20:1

25:1

Answer is:

15:1

Explanation:

The ideal (theoretical) air-fuel ratio, for a complete combustion, is called stoichiometric air-fuel ratio. For a gasoline (petrol) engine, the stoichiometric air-fuel ratio is around 14.7:1. This means that, in order to burn completely 1 kg of fuel, we need 14.7 kg of air.

60) In qualitative governing, the quantity of fuel is varied to suit the load on the engine and the total charge of air is altered.

Correct

Incorrect

Answer is:

Incorrect

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