Power Plant Engineering (2171910) MCQs

MCQs of Steam Nozzles

Showing 1 to 10 out of 41 Questions
1.

A steam nozzle covert 

(a)

the heat energy of steam into kinetic energy

(b)

the potential energy of steam into kinetic energy

(c)

the kinetic energy of steam into mechanical energy

(d)

the heat energy of steam into mechanical energy

Answer:

Option (a)

2.

A nozzle is said to be a convergent nozzle

(a)

when the cross-section of the nozzle increases continuously from the entrance to exit

(b)

when the cross-section of the nozzle decreases continuously from the entrance to exit

(c)

when the cross-section of the nozzle first decreases from the entrance to the throat and then increases from its throat to exit

(d)

none of these

Answer:

Option (b)

3.

Nozzle efficiency is described as_________________.

(a)

isentropic heat drop/useful heat drop

(b)

useful heat drop/isentropic heat drop

(c)

saturation temperature/supersaturation temperature

(d)

supersaturation temperature/saturation temperature

Answer:

Option (b)

4.

The critical pressure ratio for initially superheated steam is______________as compared to initially dry saturated steam.

(a)

more

(b)

less

(c)

same

(d)

all of these

Answer:

Option (b)

5.

The critical pressure ratio for maximum discharge condition through the nozzle is 

(a)

2n+1n-1n

(b)

2n+1nn-1

(c)

n+12n-1n

(d)

n+12n+1n

Answer:

Option (b)

6.

A nozzle is said to be choked when___________.

(a)

flow-through it is zero 

(b)

flow is attained at a maximum value corresponding to critical exit pressure

(c)

it is not possible to increase the flow by increasing inlet pressure

(d)

it is discharging into the atmosphere 

Answer:

Option (b)

7.

The velocity of the stream flowing through the nozzle is given by,

(a)

C2=2h1+h2+C12

(b)

C2=2h1-h2+C12

(c)

C2=2h2-h1+C12

(d)

C2=2h2+h1+C12

Answer:

Option (b)

8.

The steam enters the nozzle at a

(a)

high pressure and a low velocity

(b)

high pressure and a high velocity

(c)

low pressure and a low velocity

(d)

low pressure and a high velocity

Answer:

Option (a)

9.

The passage of uniformly varying cross-section in which the kinetic energy of steam increases at the expense of its pressure is called as

(a)

steam turbine

(b)

steam nozzle

(c)

steam area

(d)

all of these

Answer:

Option (b)

10.

When the inlet pressure of steam is equal to the exit pressure, then

(a)

there is a pressure drop in the nozzle

(b)

fluid flows through the nozzle

(c)

pressure drops and fluid flows through the nozzle

(d)

there is no pressure drop and fluid does not flow through the nozzle

Answer:

Option (d)

Showing 1 to 10 out of 41 Questions