Turbofan engine employs :
A. one air stream
B. two or more air streams
C. no air stream
D. solid fuel firing
The compression ratio in a jet engine varies proportional to :
A. speed
B. speed
C. altitude
D. none
For speed above 3000 km/hour, it is more advantageous to use :
A. turbo-jet engine
B. ram-jet engine
C. propellers
D. rockets
The efficiency of jet engine is :
A. higher at ground
B. higher at high altitudes
C. same at all altitudes
D. higher at high speed
E. lower at low speed
In air breathing jet engine, the jet is formed by expanding :
A. gases
B. solids
C. liquid
D. plasma
E. highly heated atmospheric air
Reheating in multistage expansion gas turbine results in :
A. high thermal efficiency
B. reduction in compressor work
C. decrease of heat loss in exhaust
D. maximum work output
Gas turbine cycle with Regenerator :
A. increases thermal efficiency
B. allows high compression ratio
C. decreases heat loss is exhaust
D. allows operation at very high altitudes
E. permits high moisture content fuel to be used
A file removes the metal during :
A. both forward and return strokes
B. forward stroke
C. return stroke
D. none of these
The working fluid in ai turbine is :
A. in two phases
B. in three phases
C. in a single phase
D. in the form of air and water mixture
The compression ratio in a gas turbine is of the roder of :
A. 3.5 : 1
B. 5 : 1
C. 8 : 1
D. 12 : 1
E. 20 : 1
Ram-jet engine :
A. is self-operating at zero flight speed
B. is not self-operating at zero flight speed
C. requires no air for its operation
D. produces a jet consisting of plasma
E. none of the abo
Pressure ratio in gas turbines is the ratio of :
A. compressor pressure ratio
B. highest pressure to exhaust pressure
C. inlet pressure to exhaust pressure
D. pressures across the turbine
E. none of the above
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