7 JULY 2021 CURRENT AFFAIRS QUIZ

The ignition of the charge by some hot surface within the engine before the passage of spark is called

Ignition delay

Pre-ignition

Detonation

Auto-ignition

TRUE ANSWER : ?
YOUR ANSWER : ?

If the ratios of all the corresponding linear dimensions are equal, then the model and the prototype are said to have

None of these

Geometric similarity

Dynamic similarity

Kinematic similarity

TRUE ANSWER : ?
YOUR ANSWER : ?

The probability of knocking in diesel engines is increased by

All of these

Low volatility

High self ignition temperature

Higher viscosity

TRUE ANSWER : ?
YOUR ANSWER : ?

The ignition quality of diesel oil is expressed by

Octane number

Cetane number

None of the listed here

Calorific value

TRUE ANSWER : ?
YOUR ANSWER : ?

The knocking tendency in spark ignition engines may be decreased by

Controlling the air-fuel mixture

Controlling the ignition timing

Controlling the exhaust temperature

Reducing the compression ratio

TRUE ANSWER : ?
YOUR ANSWER : ?

The thermal efficiency of diesel engines on weak mixtures is

Lower

Unaffected

Higher

Dependent on other factors

TRUE ANSWER : ?
YOUR ANSWER : ?

Compression loss in I.C engines occurs due to

Clogged air inlet slots

Use of thick head gasket

Leaking piston rings

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

The method of determination of indicated power of a multi cylinder spark ignition engine is by the use of

Morse test

Heat balance test

Motoring test

Prony brake test

TRUE ANSWER : ?
YOUR ANSWER : ?

The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is

More

Same

Less or more depending on operating conditions

Less

TRUE ANSWER : ?
YOUR ANSWER : ?

The _________ engines can work on very lean mixture of fuel.

Both (A) and (B)

None of these

Spark ignition

Compression ignition

TRUE ANSWER : ?
YOUR ANSWER : ?

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