Advantage of a diesel engine over petrol engine is
A.Low fuel consumption at full load as well as part load
B.Smooth operation at all speeds
C.Low compression ratio
D.No detonation problems
E.All of the above
Category: Heat Engines Mcqs
For the same temperature limits and heat input, the most efficient cycle is
A.Carnot
B.Otto
C.Diesel
D.Brayton
E.All of the above have same efficiency
Inlet valve of a IC engine remains open for
A.150?
B.180?
C.250?
D.280?
E.300?
The capacity of an automobile battery is expressed in terms of
A.Voltage
B.Number of plate
C.Amperes
D.Number of cells
E.Ampere hours
More test is conducted on
A.Single cylinder engines
B.Slow speed engines
C.High speed engines
D.Multi-cylinder engines
E.Engines with two flywheels
In naturally aspirated engine the pressure inside cylinder at the end of suction stroke is
A.Less than atmospheric
B.Same as atmospheric
C.More than atmospheric
D.Depends on atmospheric conditions
E.None of the above
Which is incorrect?
A.Compression ratio = initial volume + final volume
B.Final pressure = Initial pressure x compression ratio
C.Initial pressure = final pressure + compression ratio
D.Initial volume = compression ratio x final volume
E.None of the above
Compression ratio for spark ignition engines varies in the range
A.4 to 6
B.6 to 12
C.12 to 20
D.20 to 25
E.25 to 30
Which is not the cause for loss of heat in boiler due to incomplete combustion?
A.Insufficient air supply
B.Improper secting of boiler
C.Fuel bend in proof condition
D.Under cooling of furnace at low ratings
E.Boiler drum uninsulated
Scavenging efficiency of a four stroke diesel engine is
A.In the range 80 to 95 percent
B.In the range 50 – 80 percent
C.Below 50 percent
D.Between 100% and 95%
E.None of the above
