Engineering :: Turbo machines

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51.

Stalling of the blades of axial flow compressor is

A.	an unsteady periodic and reversal of flow	B.	the fixed mass flow rate regardless of pressure ratio
C.	the reduction in lift force at higher angle of incidence	D.	none of the above

52.

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

53.

Choking is

A.	Variation of mass flow rate in proportion to pressure ratio	B.	variation of mass flow rate in inverse proportion to pressure ratio
C.	fixed mass flow rate regardless of pressure ratio	D.	none of the above

54.

Gas turbines are taken to

A.	the gasoline and diesel engines in its working medium	B.	the petrol and diesel engines in its internal combustion
C.	the steam turbine in its aspect of steady flow of the working medium	D.	All of the above

55.

Which gas turbine has lest weight per bhp developed?

A.	Simple open cycle gas turbine	B.	Open cycle gas turbine with intercooling and reheating
C.	Open cycle gas turbine with intercooling, reheating and regeneration	D.	Closed cycle gas turbine

56.

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

57.

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

58.

The advantage of closed cycle gas turbine over open cycle gas turbine is

A.	no contamination of working substance with combustion gases	B.	inferior quality fuel can be used
C.	low maintenance costs	D.	All of the above

59.

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

60.

A constant volume combustion gas turbine operates on

A.	Ericsson cycle	B.	Brayton cycle
C.	Joule cycle	D.	Atkinson cycle