Surging is
A.an unsteady, periodic and reversal of flow in the compressor
B.the fixed mass flow rate regardless of pressure ratio
C.the reduction in lift force at higher angles of incidence
D.none of the above
Category: Turbo machines Mcqs
Thermal efficiency of a gas turbine cycle can be improved by
A.reheating between expansion stage
B.intercooling between compression stges
C.regeneration
D.any of the above
In gas turbines, intercooling results in
A.decrease in net output as well as thermal efficiency
B.decrease in net output and increase in thermal efficiency
C.increase in net output but decrease in thermal efficiency
D.increase in net output as well as thermal efficiency
A regenerator can be used on
A.open cycle gas turbines only
B.closed cycle gas turbines only
C.both open as well as closed cycle gas turbines
D.none of the above
All of the following are positive displacement compressors EXCEPT :
A.Screw compressor
B.Axial flow compressor
C.Roots blower
D.Vane blower
The efficiency of a simple open cycle gas turbine depends upon
A.pressure ratio
B.compressor efficiency
C.turbine inlet temperature
D.All of the above
Generally, steam turbines in power stations operate at
A.3000 rpm
B.1500 rpm
C.1000 rpm
D.375 rpm
E.50 rpm
For gas turbine, compressors used are
A.Reciprocating type
B.Centrifugal type
C.Axial flow type
D.Lobe type
E.Sliding vane type
The advantage of a gas turbine over a reciprocating engine is
A.perfect balancing of rotor
B.continuous and uniform power
C.usually small working pressures
D.all of the above
In a gas turbine cycle regenerator is used to
A.heat the gases coming out of combustion chamber
B.heat fuel supplied to combustion chamber
C.heat air supplied to combustion chamber
D.heat exhaust gases released from low pressure turbine
