A roots blower compresses 0.06 cubic metres of air from 1.0 bar to 1.45 bar per revolution. The compressor efficiency is nearly
A.99%
B.87%
C.75%
D.63%
Category: Turbo machines Mcqs
Most serious energy loss in reaction steam turbine
A.Steam leakage between diaphragm and shaft
B.Leakage over blade ends through radia clearance passages
C.Frictional resistance between steam and nozzle side
D.Impact loss as steam enters moving blades
E.Bearing friction
The work ratio of closed cycle gas turbine plant with fixed top temperature of the cycle and fixed pressure ratio rp
A.increases with increase in an inlet temperature to compressor
B.increases with decrease in an inlet temperature to compresor
C.remain same irrespective of inlet temperature to compressor
D.none of the above
In rotory compressors, the ratio of isentropic work to Eulers work is known as
A.slip factor
B.work factor
C.pressure coefficient
D.degree of reaction
The source of power for driving a turbocharger is
A.kinetic energy of exhaust gases from the engine
B.chemical energy of exhaust gases
C.air motor
D.electric motor
The normal shock wave in compressible flow is analogous to
A.surges in open channel
B.vortex formation in centrifugal pump
C.hydraulic bore in tidal rivers
D.hydraulic jump in channel flow
Basic closed cycle for gas turbine is
A.Carnot cycle
B.Rankine cycle
C.Brayton cycle
D.none of the above
Air fuel ratio for a gas turbine is closer to
A.10 ; 1
B.15 ; 1
C.20 ; 1
D.60 ; 1
An ideal fluid for vapour turbine cycle should have
A.high critical temperature with low pressure
B.high critical temperature with high pressure
C.low critical temperature with high pressure
D.low critical temperature with low presure
Which component of a gas turbine consumes maximum power?
A.Starter
B.Regenerator
C.Compressor
D.Combustion chamber
