Supercharging is essential in_____________?
A. diesel engines
B. gas turbines
C. petrol engines
D. aircraft engines
E. marine engines
I.C. Engines
The reason for supercharging in any engine is to________________?
The reason for supercharging in any engine is to________________?
A. increase efficiency
B. increase power
C. reduce weight and bulk for a given out-put
D. effect fuel economy
E. none of the above
The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________?
The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________?
A. equal to stroke volume
B. equal to stroke volume and clearance volume
C. less than stroke volume
D. more than stroke volume
E. more than cylinder volume
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________?
The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________?
A. higher
B. lower
C. remain unaffected
D. unpredictable
E. none of the above
Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following______________?
Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following______________?
Which of the following is false statement?
A. piston ring and cylinder wear
B. formation of hard coating on piston skirts
C. oil sludge in the engine crank case
D. detonation
E. forms corrosive acids
The size of inlet valve of.an engine in comparison to exhaust valve is_________________?
The size of inlet valve of.an engine in comparison to exhaust valve is_________________?
A. more
B. less
C. same
D. more/less depending on capacity of engine
E. varies from design to design
The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?
A. same
B. more
C. less
D. less or more depending on operating conditions
E. unpredictable
Engine pistons ‘are usually made of aluminium alloy because it_________________?
Engine pistons ‘are usually made of aluminium alloy because it_________________?
A. is lighter
B. wears less
C. absorbs shocks
D. is stronger
E. does not react with fuel and lub oil
In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
In diesel engine, the compression ratio in comparison to expansion ratio is_______________?
A. same
B. less
C. more
D. variable
E. more/less depending on engine capacity.
Polymerisation is a chemical process in which molecules of a compound become________________?
Polymerisation is a chemical process in which molecules of a compound become________________?
A. larger
B. slowed down
C. smaller
D. liquid
E. gaseous