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

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

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

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

Which is more viscous lub oil_________________?

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

A stoichiometric air-fuel ratio is______________________?

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

In loop scavenging, the top of the piston is________________?

A. Flat
B. Contoured
C. Slanted
D. Depressed

In the crankcase method of scavenging, the air pressure is produced by_________________?

A. Supercharger
B. Centrifugal pump
C. Natural aspirator
D. Movement of engine piston

In a naturally aspirated diesel engine, the air is supplied by________________?

A. A supercharger
B. A centrifugal blower
C. A vacuum chamber
D. An injection tube

In the opposed piston diesel engine, the combustion chamber is located________________?

A. Above the piston
B. Below the piston
C. Between the pistons
D. There is no such criterion

Basic tool in work study is __________________?

A. Graph paper
B. Process chart
C. Planning chart
D. Stop watch