Online Mechanical Engineering Test - Steam Nozzles and Turbines Test

Instruction:

This is a FREE online test. Beware of scammers who ask for money to attend this test.
Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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All the best!

1.

The steam enters the nozzle at a

high pressure and a low velocity

high pressure and a high velocity

low pressure and a low velocity

low pressure and a high velocity

[#]

2.

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, p₂) will be

3.3 bar

5.46 bar

8.2 bar

9.9 bar

[#]

3.

The action of steam in a steam turbine is

static

dynamic

static and dynamic

neither static nor dynamic

[#]

4.

De-Laval turbine is a

single rotor impulse turbine

multi-rotor impulse turbine

impulse reaction turbine

none of these

[#]

5.

Steam turbines are used for

large marine propulsion

electric power generation

direct drive of fans, compressors, pumps

all of these

[#]

6.

A steam nozzle converts

heat energy of steam into kinetic energy

kinetic energy into heat energy of steam

heat energy of steam into potential energy

potential energy into heat energy of steam

[#]

7.

The flow of steam is super-sonic

at the entrance to the nozzle

at the throat of the nozzle

in the convergent portion of the nozzle

in the divergent portion of the nozzle

[#]

8.

The velocity of steam at throat of the nozzle is __________ the velocity of sound.

equal to

less than

more than

[#]

9.

In an impulse turbine

the steam is expanded in nozzles only and there is a pressure drop and heat drop

the steam is expanded both in fixed and moving blades continuously

the steam is expanded in moving blades only

the pressure and temperature of steam remains constant

[#]

10.

In a reaction turbine

the steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades

the expansion of steam takes place partly in the fixed blades and partly in the moving blades

the steam is expanded from a high pressure to a condenser pressure in one or more nozzles

the pressure and temperature of steam remains constant

[#]

11.

Rateau turbine is

simple reaction turbine

velocity compounded turbine

pressure compounded turbine

pressure-velocity compounded turbine

[#]

12.

Curtis turbine is a

simple reaction turbine

velocity compounded turbine

pressure compounded turbine

pressure-velocity compounded turbine

[#]

13.

The ratio of the isentropic heat drop to the heat supplied, is called

reheat factor

stage efficiency

internal efficiency

Rankine efficiency

[#]

14.

The ratio of the work delivered at the turbine shaft to the heat supplied is called overall thermal efficiency of turbine.

True

False

[#]

15.

A nozzle is said to be a convergent-divergent nozzle, when the cross-section of a nozzle first decreases from its entrance to throat and then increases from its throat to exit.

True

False

[#]

16.

When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.

increases

decreases

[#]

17.

The friction present between the steam and the nozzle surfaces reduces the heat drop by

10 to 15 percent

15 to 25 percent

25 to 40 percent

40 to 60 percent

[#]

18.

Steam turbines may be classified according to

direction of steam flow

number of stages

mode of steam action

all of these

[#]

19.

In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

low

very low

high

very high

[#]

20.

The blade friction in the impulse turbine reduces the velocity of steam by __________ while it passes over the blades.

10 to 15%

15 to 20%

20 to 30%

30 to 40%

[#]

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