When steam expands without doing mechanical work, its enthalpy
A.Increases
B.Decreases
C.Does not change
D.Depends on the factors
E.None of the above
Category: Heat Engines Mcqs
A Lungistrom turbine is
A.Impulse turbine
B.Reaction turbine
C.Outward radial flow turbine
D.Inward flow impulse reaction turbine
E.None of the above
Compression ratio in case of gas engines waries in the range
A.5 to 10
B.10 to 15
C.15 to 20
D.20 to 24
E.24 to 30
An Orsat’s apparatus is used for
A.Volumetric analysis of the flue gas
B.Gravimetric analysis of the flue gases
C.Smoke density analysis of the flue gases
D.All of above
E.None of above
Thermal efficiency of C.I. engines on weak mixtures is
A.Higher
B.Lower
C.Unaffected
D.Depends on other factors
E.None of the above
If a steam injector lifts the water but fails to force it into the boiler, the trouble may not be due to
A.Combining tube clogged
B.Insufficient steam pressure
C.Sry steam
D.Leake in water pipe
E.Any of the above
Boilers using Bagasse as fuel use
A.Spreader stokers
B.Underfeed stokers
C.Travelling grate stroker
D.Pulverized fuel burners
E.Chain grate stokers
Direction of feed water is done because
A.It reduces weight of water to be handled
B.It reduced priming difficulties in feed pumps
C.It reduces corrosion caused by oxygen present in air
D.It reduces amount of heat required to convert water into steam
E.None of the above
In wet dry lubrication of diesel engines
A.Oil is splashed
B.Oil is splashed and pumped to various points
C.Oil is pumped to various points
D.All of the above
E.None of the above
Which statement is false in case of SI engines
A.Increasing the length of the carbon chain increases the knocking tendency
B.Centralising the carbon atoms decreases the knocking tendency
C.Adding methyl groups to the side of the carbon chain increases the knocking tendency
D.Unsaturated aliphatic hydrocarbons show less knocking tendency
E.Accetylene has least tendency to knocking
