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STEAM NOZZLES

Total questions: 94

Worksheet time: 1hrs 12mins

Name
Class
Date
1.

The flow of steam in a nozzle is subsonic at......

a)

Throat

b)

Entrance

c)

Convergent portion

d)

Divergent portion

2.

The flow of steam is supersonic .........

a)

At the entrance to the nozzle

b)

At the throat of the nozzle

c)

In the convergent portion of the nozzle

d)

In the divergent portion of the nozzle

3.

The maximum velocity attainable at the throat of a steam nozzle is......

a)

less than sonic velocity

b)

Sonic velocity

c)

more than sonic velocity

d)

Supersonic velocity

4.

Which of the following devices uses wilson's line in determining flow through it.......

a)

Steam engine

b)

Steam nozzle

c)

Reaction turbine

d)

Impulse turbine

5.

The Effect of friction in a nozzle......dryness fraction of steam

a)

Increases

b)

Decreases

c)

Same

6.

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

7.

The critical pressure ratio for initially dry saturated steam is.......

a)

0.528

b)

0.546

c)

0.577

d)

0.582

8.

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

9.

In convergent nozzle velocity velocity attained is.......

a)

Velocity of sound

b)

Supersonic velocity

c)

Around 500 m/sec

d)

1000 meter/sec

10.

The value of critical pressure ratio for superheated steam is.......

a)

0.5

b)

0.546

c)

0.454

d)

0.64

11.

The value of critical pressure ratio for initially wet steam is.......

a)

0.546

b)

0.5

c)

0.554

d)

0.582

12.

The flow of steam is supersonic.........

a)

At the entrance to the nozzle

b)

At the throat of the nozzle

c)

In the convergent portion of the nozzle

d)

In the divergent portion of the nozzle

13.

The maximum velocity attainable at the throat of a steam nozzle is......

a)

Much less than sonic velocity

b)

Slightly less then sonic velocity

c)

Sonic velocity

d)

Slightly more than sonic velocity

e)

Supersonic velocity

14.

The effect of friction in nozzle is to .......

a)

Keep dryness fraction constant

b)

Increase dryness fraction

c)

Decrease dryness fraction

d)

First increase dryness fraction up to certain limit and then decrease it

15.

Under thermal equilibrium, flow of steam is.......

a)

Isentropic

b)

Adiabatic

c)

Hyperbolic

d)

Polytropic

16.

Shock effect in a nozzle is felt in.........

a)

Divergent portion

b)

Straight portion

c)

Convergent portion

d)

Throat

17.

The Effect of friction in a nozzle......dryness fraction of steam

a)

Increases

b)

Decreases

c)

Same

d)

None of the above

18.

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

a)

More

b)

Less

c)

Same

d)

None of the above

19.

A nozzle is said to be choked when .......

a)

Flow-through it is zero

b)

Flow is attained at 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 atmosphere

20.

In a nozzle, the effect of supersaturation is to.......

a)

Decrease the dryness fraction of steam

b)

Decreases the specific volume of steam

c)

Increase the entropy

d)

Increase the enthalpy drop

21.

That density of super saturated steam is about.........that of the ordinary saturated vapour at the corresponding pressure

a)

Same as

b)

2 times

c)

4 times

d)

8times

22.

The superposition of steam results in slight......

a)

Increase in entropy

b)

Increase of final dryness fraction

c)

Increase of discharge

d)

Increase of density

e)

All the above

23.

For critical pressure ratio, the discharge through a nozzle is......

a)

Maximum

b)

Minimum

c)

Zero

d)

Some value between maximum and minimum

24.

The difference of supersaturated temperature and saturation temperature at that pressure is known as .......

a)

Degree of supersaturation

b)

Degree of superheat

c)

Degree of undercooling

d)

None of these

25.

For a convergent divergent nozzle, critical pressure ratio occurs when …..

a)

Velocity at exit becomes sonic

b)

Shock wave of occurs

c)

Nozzle efficiency is maximum

d)

Increase in exit and inlet pressure ratio does not increase steam flow rate

26.

For a convergent divergent nozzle, the mass flow rate remains constant if the ratio of exit and inlet pressures.........

a)

Is less then critical pressure ratio

b)

Is equal to the critical pressure ratio

c)

Is more then critical pressure ratio

d)

Is infinity

27.

Mack number is more than unity in the following portion of a convergent divergent nozzle......

a)

Convergent potion

b)

Straight portion

c)

Throat

d)

Divergent potion

28.

If a flow is to be continuously accelerated from a subsonic to a supersonic velocity in nozzle, it must .......

a)

Be convergent

b)

Be divergent

c)

Have throat

d)

Have first divergent section and then convergent section

29.

A nozzle is said to be a convergent 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 above

30.

The discharge is __________ at critical pressure

a)

Zero

b)

Minimum

c)

Maximum

d)

None of these

31.

Nozzle is duct of varying cross-sectional area, in which pressure energy of fluid is converted into

a)

Mechanical Energy

b)

Hydraulic Energy

c)

Kinetic Energy

d)

Some other forms of enegy

32.

Critical pressure means pressure of steam at

a)

throat

b)

inlet

c)

exit

d)

inside the nozzle

33.

Velocity of steam at throat corresponds to maximum discharge condition

a)

minimum velocity

b)

critical velocity

c)

average velocity

d)

mean velocity

34.

Existence of fluid in super-heated state in wet region

a)

Metastable

b)

Supersaturated

c)

superheated

d)

moisturised

35.

Difference between saturation temperature and temperature of supersaturated vapour

a)

Degree of supersaturation

b)

Degree of super-cooling

c)

Degree of sub-cooling

d)

Degree of sub-saturation

36.

Nozzle efficiency is

a)

ratio of isentropic enthalpy drop to actual enthalpy drop

b)

ratio of actual enthalpy drop to actual isentropic enthalpy drop

c)

ratio of isentropic enthalpy drop to saturation temperature

d)

ratio of actual enthalpy drop to saturation temperature

37.

Effect of friction in a nozzle

a)

Reduction in enthalpy drop and exit velocity

b)

Reheating of fluid

c)

Increase in specific volume

d)

Decrease in mass flow rate

38.

Effect of supersaturation flow

a)

Actual heat drop is slightly reduced

b)

exit velocity is slightly increased

c)

specific volume is increased

d)

mass flow rate and entropy is decreased

39.

Nozzle velocity coefficient

a)

velocity at the nozzle exit with isentropic flow and same exit pressure / Actual velocity at the nozzle exit

b)

Actual velocity at the nozzle exit / Critical Velocity

c)

Actual velocity at the nozzle exit / velocity at the nozzle exit with isentropic flow and same exit pressure

d)

Critical Velocity / Actual velocity at the nozzle exit

40.
A nozzle is said to be a convergent 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 above
41.
The flow through a nozzle is regarded as
a)
constant volume flow
b)
constant pressure flow
c)
isothermal flow
d)
isentropic flow
42.
The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
a)
remains same
b)
decreases
c)
increases
43.

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

a)

V = 44.72 hdkh_d\sqrt{k}

b)

V = 44.72 khdk\sqrt{h_d}

c)

V = 44.72 khd\sqrt{kh_d}

d)

V = 44.72 khdkh_d

44.
The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.
a)
Agree
b)
Disagree
45.

The critical pressure ratio (p2/p1) is given by

a)
b)
c)
d)
46.
The pressure at which the steam leaves the nozzle is known as back pressure.
a)
Correct
b)
Incorrect
47.
When the back pressure of a nozzle is below the designed value of pressure at exit of nozzle, the nozzle is said to be
a)
choked
b)
underdamping
c)
overdamping
d)
none of these
48.
The critical pressure ratio for initially dry saturated steam is more as compared to initially wet steam.
a)
Yes
b)
No
49.
Under thermal equilibrium, flow of steam is
a)
Isentropic
b)
Adiabatic
c)
Hyperbolic
d)
Polytropic
50.
The discharge through a nozzle is maximum for a certain value of exit pressure. This pressure is known as critical pressure.
a)
true
b)
false
51.

Critical pressure ratio for dry saturated steam

a)

0.546

b)

0.577

c)

0.585

d)

0.564

52.

The critical Pressure ratio for super-heated steam

a)

0.577

b)

0.546

c)

0.537

d)

0.584

53.

Degree of super-saturation

a)

Ratio of the saturation pressure corresponding to temperature of steam condensate to actual pressure

b)

Ratio of actual pressure to the saturation pressure corresponding to temperature of steam condensate

c)

Ratio of actual pressure to the saturation pressure corresponding to temperature of steam evaporate

d)

Ratio of the saturation pressure corresponding to temperature of steam evaporate to actual pressure

54.

Steam nozzle concept is

a)

Very difficult to understand

b)

Moderate

c)

Easy to understand

d)

Having lot of doubt

55.

Steam nozzle concept is

a)

Very difficult to understand

b)

Moderate

c)

Easy to understand

d)

Having lot of doubt

56.

Are you familiar to make use of steam table and Mollier diagram?

a)

Yes, I can able to refer both

b)

I can able to refer steam table but no idea to refer Mollier diagram

c)

I can able to refer Mollier diagram but no idea to refer steam table

d)

No, Both are difficult to me

57.

Coefficient of Discharge

a)

Actual mass flow rate / mass flow rate with isentropic flow

b)

mass flow rate with isentropic flow /Actual mass flow rate

c)

Actual mass flow rate / minimum mass flow rate

d)

Minimum mass flow rate / Actual mass flow rate

58.

A nozzle is said to be a convergent nozzle

a)

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

b)

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

c)

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

d)

D.none of the above

59.

The flow through a nozzle is regarded as

a)

A.constant volume flow

b)

B.constant pressure flow

c)

C.isothermal flow

d)

D.isentropic flow

60.

The ratio of total useful heat drop to the total isentropic heat drop, is called

a)

A.stage efficiency

b)

B.internal efficiency

c)

C.Rankine efficiency

d)

D.none of these

61.

The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)

a)

A.remains constant

b)

B.decreases

c)

C.increases

62.

The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

a)

A.remains same

b)

B.decreases

c)

C.increases

63.

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

a)

A.V = 44.72 hd square root K

b)

B.V = 44.72 K hd

c)

C.V = 44.72 K square root hd

d)

D.V = 44.72 K hd

64.

In a nozzle, whole frictional loss is assumed to occur between

a)

A.inlet and thoroat

b)

B.inlet and outlet

c)

C.throat and exit

d)

D.all of these

65.

The critical pressure ratio for initially wet steam is

a)

A.0.546

b)

B.0.577

c)

C.0.582

d)

D.0.601

66.

Calculate the enthalpy drop steam enters a convergent-divergent nozzle at 11 bar and 250°C and leaves at 1 bar. The expansion is to be considered metastable.

a)

a) 427031.34 kJ/kg

b)

b) 55648.32 kJ/kg

c)

c) 323654.25 kJ/kg

d)

d) 158469.21 kJ/kg

67.

What is the value of index of expansion for supersaturated steam. (Pvn=C, n is the index of expansion)

a)

a) 1.300

b)

b) 1.013

c)

c) 1.135

d)

d) 1.000

68.

Determine the velocity coefficient if the efficiency of a convergent-divergent steam nozzle is 92%. The inlet velocity of steam is negligible.

a)

a) 0.959

b)

b) 0.120

c)

c) 0.465

d)

d) 0.542

69.

Initial velocity of the steam entering a convergent-divergent steam nozzle is 60 m/s. Steam expands from 15 bar and 250°C to 1 bar. Determine the exit velocity of steam if nozzle has an efficiency of 95%.

a)

a) 973.08 m/s

b)

b) 654.32 m/s

c)

c) 785.45 m/s

d)

d) 900.75 m/s

70.

Dry and saturated steam at 10 bar enters a convergent-divergent nozzle and leaves at 1 bar. If 8% of heat drop is lost in friction find the percentage decrease in final velocity. Neglect initial velocity.

a)

a) 5.65%

b)

b) 3.87%

c)

c) 2.14%

d)

d) 4.08%

71.
A nozzle is said to be a convergent 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 above
72.
The flow through a nozzle is regarded as
a)
constant volume flow
b)
constant pressure flow
c)
isothermal flow
d)
isentropic flow
73.
The ratio of total useful heat drop to the total isentropic heat drop, is called
a)
stage efficiency
b)
internal efficiency
c)
Rankine efficiency
d)
none of these
74.
The pressure at which the steam leaves the nozzle is known as back pressure.
a)
Correct
b)
Incorrect
75.
The discharge of steam in a convergent-divergent nozzle __________ after the throat (i.e. in the divergent portion of the nozzle)
a)
remains constant
b)
decreases
c)
increases
76.
The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.
a)
remains same
b)
decreases
c)
increases
77.
In a nozzle, whole frictional loss is assumed to occur between
a)
inlet and thoroat
b)
inlet and outlet
c)
throat and exit
d)
all of these
78.
The value of critical pressure ratio for superheated steam is
a)
0.5
b)
0.546
c)
0.454
d)
0.64
79.
The discharge is __________ at critical pressure.
a)
zero
b)
minimum
c)
maximum
80.
The supersaturated flow of steam through a nozzle as compared to a stable flow, the available heat drop
a)
remains the same
b)
increases
c)
decreases
d)
is unpredictable
81.
The steam leaves 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
82.
The effect of friction in nozzle is to
a)
Keep dryness fraction constant
b)
Increase dryness fraction
c)
Decrease dryness fraction
d)
First increase dryness fraction upto certain limit and then decrees it
83.
Under thermal equilibrium, flow of steam is
a)
Isentropic
b)
Adiabatic
c)
Hyperbolic
d)
Polytropic
84.
The critical pressure ratio for initially superheated steam is_____as compared to initially dry saturated steam
a)
More
b)
Less
c)
Same
d)
None of the above
85.
A nozzle is said to be choked when
a)
Flow-through it is zero
b)
Flow is attained at 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 atmosphere
86.
For a convergent divergent nozzle,critical pressure ratio occurs when
a)
Velocity at exit becomes sonic
b)
Shock wave of occurs
c)
Nozzle efficiency is maximum
d)
Increase in exit and inlet pressure ratio does not increase steam flow rate
87.
Mach number is more than unity in the following portion of a convergent divergent nozzle
a)
Convergent potion
b)
Throat
c)
Divergent potion
d)
Straight portion
88.
A steam nozzle covert
a)
heat energy of steam into kinetic energy
b)
potential energy of steam into kinetic energy
c)
kinetic energy of steam into mechanical energy
d)
heat energy of steam into mechanical energy
89.
The smallest section in nozzle is known as
a)
throat
b)
venturi
c)
convergent
d)
divergent
90.
The discharge is __________ at critical pressure.
a)
Zero
b)
Minimum
c)
Maximum
d)
None of these
91.
The expansion of steam in a nozzle follows
a)
Carnot cycle
b)
 Rankine cycle
c)
Joule cycle
d)
Stirling cycle
92.
The discharge of steam in a convergent-divergent nozzle __________ after the throat
a)
Remains constant
b)
Decreases
c)
Increases
d)
None of these
93.
When the cross-section of a nozzle increases continuously from entrance to exit, it is called a
a)
Divergent nozzle
b)
Convergent nozzle
c)
Convergent-divergent nozzle
d)
None of these
94.
The pressure of steam at throat of a steam nozzle is called critical pressure
a)
true
b)
false

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