The impulse turbine rotor efficiency will have a maximum value of 0.5 cos α, where α is the nozzle exit flow angle, if the

blade velocity coefficient is unity

blades are equiangular and frictionless

Explore topic-wise MCQs in Mechanical Engineering.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.	In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, ) will be
A.	3.3 bar
B.	5.46 bar
C.	8.2 bar
D.	9.9 bar
Answer» C. 8.2 bar

Discussion

2.	The impulse turbine rotor efficiency will have a maximum value of 0.5 cos α, where α is the nozzle exit flow angle, if the
A.	blades are equiangular
B.	blade velocity coefficient is unity
C.	blades are equiangular and frictionless
D.	blade solidity is 0.65
Answer» D. blade solidity is 0.65

Discussion

3.	The critical pressure ratio is given by (where = Initial pressure of steam, and = Pressure of steam at throat or critical pressure)
A.
B.	/
C.	/
D.	+
Answer» D. +

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, ) will be

The impulse turbine rotor efficiency will have a maximum value of 0.5 cos α, where α is the nozzle exit flow angle, if the

The critical pressure ratio is given by (where = Initial pressure of steam, and = Pressure of steam at throat or critical pressure)