For gas turbines compressors used are
A.Reciprocating type
B.Centrifugal type
C.Axial flow type
D.Lobe type
E.Sliding vane type
Category: Heat Engines Mcqs
Air fuel ratio in a petrol engine fitted with dirty air cleaner as compared to that with clean air clearance will be
A.Higher
B.Lower
C.Not affected
D.Fluctuating
E.Depends on load
Crankshafts are generally
A.Sand cast
B.Die cast
C.Turned from bar stock
D.Forged
E.Cold headed
Flash point of a liquids is the temperature at which
A.The fuel emits vapours at a rate which produces an inflammable mixture with air
B.The fuel spontaneously ignites
C.The fuel ignites with clearly visible flash
D.The fuel ignites without a park
E.Fuel vaporises at the prescribed rate
With reference to a safety valve the blow down pressure is the pressure at which
A.Valve opens
B.Valve closes after opening
C.Valve opens initially
D.Valve spring pressure is adjusted
E.None of the above
A starting motor should have capacity to generate power equal to
A.IHP
B.BHP
C.IHP-BHP
D.Friction horse power
E.Friction horse power at cranking r.p.m
A regenerator in a gas turbine
A.Reduces heat loss in exhaust
B.permits use of higher compression ratio
C.Improves thermal efficiency
D.Permits use of fuels of inferior quality
E.None of the above
For dry saturated steam the value of adiabatic index n is taken as
A.1.68
B.1.41
C.1.35
D.1.135
The efficiency of jet engine is higher at
A.Lower altitudes
B.Higher altitude
C.Low speeds
D.High speeds
E.None of the above
In multistages turbines by introducting reheating
A.Thermal efficiency improves
B.The output of turbine increases
C.Work done by compressor reduces
D.The ratio compressor compressor work/turbine output decreases
E.None of the above
