A stoichiometric air-fuel ratio is______________________?

A. Chemically correct mixture
B. Lean mixture
C. Rich mixture for idling
D. Rich mixture for over loads

Which is more viscous lub oil_________________?

A. sea 30
B. sae 4£
C. sae 50
D. sae 70

The air-fuel ratio in petrol engines-is controlled by__________________?

A. Controlling valve opening/closing
B. Governing
C. Injection
D. Carburettion

Pour point of fuel oil is the_________________?

A. Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
B. Temperature at which it solidifies or congeals
C. It catches fire without external aid
D. Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of _________________?

A. 9 : 1
B. 12 : 1
C. 15 : 1
D. 18 : 1

Air fuel ratio for idling speed of a petrol engine is approximately_________________?

A. 1 : 1
B. 5 : 1
C. 10:1
D. 15 : 1

Which of the following is the lightest and most volatile liquid fuel________________?

A. Diesel
B. Kerosene
C. Fuel oil
D. Gasoline

Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power_____________?

A. upto 25%
B. upto 35%
C. upto 50%
D. upto 75%

The mean effective pressure obtained from engine indicator indicates the________________?

A. maximum pressure developed
B. minimum pressure
C. instantaneous pressure at any instant
D. exhaust pressure

In a typical medium speed 4 stroke cycle diesel engine_______________?

A. Exhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center
B. Exhaust valve opens at bottom ‘dead center and closes at top dead center
C. Exhaust valve opens just after bottom dead center and closes just before top dead center
D. May open and close anywhere