Thermal efficiency of a spark ignition engine at full load usually is in the range
A.70 to 90 percent
B.50 to 70 percent
C.30 to 35 percent
D.10 to 25 percent
E.5 to 10 percent
Category: Heat Engines Mcqs
The performance of air compressor at high altitudes as compared to that at sea level will be
A.Better
B.Same
C.Inferior
D.Will depend upon temperature of air
E.Will depend on type of compressor
In a SI engine the advancing of spark timing will
A.Increase knocking tendency
B.Reduce knocking tendency
C.Not have any effect
D.Depends on intensity of spark only
E.None of the above
Air standard efficiency of an I.C. engine depends on
A.Compression ratio
B.Speed of operation
C.Fuel used
D.Torque
E.All of the above
In diesel engines thermal efficiency may be expected in the range
A.10 – 15 percent
B.15 to 25 percent
C.25 to 30 percent
D.35 to 40 percent
E.50 percent
Thermal efficiency of a standard Otto cycle for a compression ratio 5.5, will be
A.20%
B.35.40%
C.47.50%
D.50%
E.100%
If a steam injector fails to lift the water the trouble may not be due to
A.Too low steam pressure for list
B.Water pipe clogged
C.Water supply to cold
D.End of water pipe not submerged
The Clapeyron equation is applicable for
A.System in equilibrium
B.Change of state
C.Change of state when two phases are in equilibrium
D.Change of state when water and water vapours are involved
E.None of the above
Dew point temperature is an indication of
A.Moisture constant of air
B.Dryness of air
C.Lowest temperature where air and water vapour start separating
D.Condition of air
E.Condition of moisture in air
