MCQs of Steam Nozzles (Power Plant Engineering - 2171910)

Showing 11 to 20 out of 41 Questions

11.

The smallest section in the nozzle is known as

12.

A nozzle is said to be a divergent nozzle

(a)	when the cross-section of the nozzle increases continuously from entrance to exit
(b)	when the cross-section of the nozzle decreases continuously from entrance to exit
(c)	when the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit
(d)	none of the given

13.

Which of the following is not true for steam nozzles?

(a)	In a convergent nozzle, there is divergent after throat
(b)	Convergent-divergent nozzle has a higher expansion ratio
(c)	Convergent-divergent nozzle produces steam at higher velocities as compared to a convergent nozzle
(d)	All of these

14.

Which of the following is true for steam flow through nozzle?

(a)	The flow is assumed to be adiabatic
(b)	The steam loses its pressure and heat while passing through the nozzle
(c)	The work done is equal to the adiabatic heat drop
(d)	All of these

15.

The ratio of actual mass flow rate (ṁ_a) to ideal mass flow rate (ṁ_i) is called as

(a)	nozzle coefficient
(b)	coefficient of nozzle friction
(c)	coefficient of discharge
(d)	coefficient of mass

16.

The critical pressure ratio for initially dry saturated steam is

17.

The critical pressure ratio for superheated steam is

18.

The value of critical pressure ratio for initially wet steam is

19.

The steam leaves the nozzle at a

(a)	high pressure and low velocity
(b)	high pressure and high velocity
(c)	low pressure and low velocity
(d)	low pressure and high velocity

20.

The flow of steam in a nozzle is subsonic at____________.

Showing 11 to 20 out of 41 Questions