Engineering :: Turbo machines

@ : Home > Mechanical Engineering > Turbo machines

41.

Normal standard of compression for rotary compressor is

A.	adiabatic compression	B.	polytropic compression
C.	isentropic compression	D.	constant pressure compression

42.

Though there are no cyclic variations even then rotary compressors need precise balancing because

A.	It is bulky in size	B.	cooling arrangement does not exist
C.	operating speeds are too high	D.	it is driven by an electric motor

43.

In air compressor performance curve a surge line represents

A.	limits of compressor discharge	B.	limit of compressor efficiency
C.	limit of stable operation	D.	lower critical speed of shaft

44.

Curtis turbine is

A.	in impulse turbine	B.	a velocity compounded turbine
C.	a pressure compounded turbine	D.	a velocity pressure compounded turbine

45.

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

46.

Maximum delivery pressure in case of rotary compressors is usually restricted to

A.	2 atmospheres	B.	5 atmospheres
C.	10 atmospheres	D.	20 atmospheres

47.

Which of the following is a displacement compressors?

A.	Reciprocating air compressor	B.	Vane blower
C.	Centrifugal blower	D.	Axial flow compressors

48.

Which type of rotary compressor is used in oil fired furnaces?

A.	Sliding vane type blower	B.	Screw compressor
C.	Axial flow compressor	D.	Centrifugal blower

49.

In rotary compressors, slip factor is the ratio of

A.	stagnation pressure to static pressure	B.	isentropic work done to actual work
C.	outlet whirl velocity to the blade velocity	D.	none of the above

50.

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