Steam Nozzles and Turbines MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Steam Nozzles and Turbines, a fundamental topic in the field of Mechanical Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Steam Nozzles and Turbines MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Steam Nozzles and Turbines mcq questions that explore various aspects of Steam Nozzles and Turbines problems. Each MCQ is crafted to challenge your understanding of Steam Nozzles and Turbines principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Mechanical Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Steam Nozzles and Turbines MCQs are your pathway to success in mastering this essential Mechanical Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Steam Nozzles and Turbines. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Steam Nozzles and Turbines knowledge to the test? Let's get started with our carefully curated MCQs!

Steam Nozzles and Turbines MCQs | Page 13 of 15

Discover more Topics under Mechanical Engineering

Q121.
In a Parson's turbine stage, blade velocity is 320 m/s at the mean radius and rotor blade exit angle is 30°. For minimum kinetic energy of the steam leaving the stage, the steam velocity at the exit of the rotor will be

a.

160/3 m/s

b.

320/3 m/s

c.

640/3 m/s

d.

640 m/s

Discuss
Answer: (c).640/3 m/s
Q122.
In a nozzle, the effect of supersaturation is to

a.

decrease dryness fraction of steam

b.

decrease specific volume of steam

c.

increase the entropy

d.

increase the heat drop

Discuss
Answer: (c).increase the entropy
Q123.
Which of the following statement is correct?

a.

The efficiency of steam turbines is greater than steam engines.

b.

A flywheel is a must for steam turbine.

c.

The turbine blades do not change the direction of steam issuing from the nozzle

d.

The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades

Discuss
Answer: (a).The efficiency of steam turbines is greater than steam engines.
Q124.
The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ number of stages are required.

a.

more

b.

less

c.

Can't say

d.

None of these

Discuss
Answer: (b).less
Q125.
If the critical pressure ratio for steam is 0.546, then the steam is initially

a.

wet steam

b.

dry saturated steam

c.

superheated steam

d.

none of these

Discuss
Answer: (c).superheated steam
Q126.
Which of the following statement is wrong?

a.

The critical pressure gives the velocity of steam at the throat equal to the velocity of sound.

b.

The flowin the convergent portion of the nozzle is sub-sonic.

c.

The flow in the divergent portion of the nozzle is super-sonic.

d.

To increase the velocity of steam above sonic velocity (super-sonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.

Discuss
Answer: (d).To increase the velocity of steam above sonic velocity (super-sonic) by expanding steam below the critical pressure, the divergent portion for the nozzle is not necessary.
Q127.
Steam turbines may be classified according to

a.

direction of steam flow

b.

number of stages

c.

mode of steam action

d.

all of these

Discuss
Answer: (d).all of these
Q128.
The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

a.

regenerative heating

b.

reheating of steam

c.

bleeding

d.

none of these

Discuss
Answer: (c).bleeding
Q129.
In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

a.

260 kW

b.

282 kW

c.

296 kW

d.

302 kW

Discuss
Answer: (b).282 kW
Q130.
In an impulse turbine, steam expands

a.

wholly in blades

b.

wholly in nozzle

c.

partly in the nozzle and partly in blades

d.

none of these

Discuss
Answer: (b).wholly in nozzle
Page 13 of 15