With increase in pressure ratio, thermal efficiency of a simple gas turbine plant with fixed turbine inlet temperature
A.increases
B.decreases
C.first increases and then decreases
D.none of the above
Category: Turbo machines Mcqs
In a nozzle if back pressure is equal to inlet pressure
A.no flow occurs
B.maximum flow occurs
C.flow is subsonic in diverging section
D.flow is supersonic in converging as well as supersonic sections
Working medium for closed cycle gas turbine should have
A.high molecular weight
B.low specific volume
C.higher adiabatic index
D.lower specific speed
In a two stage gas turbine plant reheating after first stage_____________?
A.increases thermal efficiency
B.decreases thermal efficiency
C.doesoes not affect thermal efficiency
D.none of the above
Continue reading “In a two stage gas turbine plant reheating after first stage_____________?”
The range of compression ratio in a gas turbine is
A.3 to 6
B.5 to 8
C.8 to 12
D.12 to 22
The ratio of actual velocity to the local velocity of sound is called
A.Velicity ratio
B.Velocity factor
C.Speed ratio
D.Mach number
In a velocity compounded steam turbine, as steam moves along moving and guide blades
A.pressure is low and velocity gradually decreases
B.pressure gradually increases and velocity is low
C.both pressure and velocity gradually decrease
D.Both pressure and velocity gradually increase.
As a result of blade friction, the outlet relative velocity of impulse turbine compared to inlet relative velocity is
A.Nearly same
B.2% less
C.10% – 15% less
D.30% less
E.50% less
Gas turbine used in aircraft is of
A.open cycle type
B.closed cycle type with reheating
C.closed cycle type with reheating and regeneration and intercooling
D.open cycle type with reheating, regeneration and intercooling
Which of the following is a pressure compounded turbine?
A.Parson’s turbine
B.Curtis turbine
C.Rateau turbine
D.All of the above
