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 4 of 15

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Q31.
The maximum efficiency of a reaction turbine is

a.

2 sin²ฮฑ/(1 + sin²ฮฑ)

b.

2 cos²ฮฑ/(1 + cos²ฮฑ)

c.

(1 + sin²ฮฑ)/2 sin²ฮฑ

d.

(1 + cos²ฮฑ)/2 cos²ฮฑ

Discuss
Answer: (b).2 cos²ฮฑ/(1 + cos²ฮฑ)
Q32.
The ratio of the useful heat drop to the isentropic heat drop is called

a.

condenser efficiency

b.

nozzle efficiency

c.

boiler efficiency

d.

vacuum efficiency

Discuss
Answer: (b).nozzle efficiency
Q33.
The efficiency of steam turbines may be improved by

a.

reheating of steam

b.

regenerative feed heating

c.

binary vapour plant

d.

any one of these

Discuss
Answer: (d).any one of these
Q34.
In a reaction turbine, when steam flows through the fixed blades,

a.

pressure increases while velocity decreases

b.

pressure decreases while velocity increases

c.

pressure and velocity both decreases

d.

pressure and velocity both increases

Discuss
Answer: (b).pressure decreases while velocity increases
Q35.
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

d.

None of these

Discuss
Answer: (a).remains constant
Q36.
The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

a.

remains same

b.

decreases

c.

increases

d.

None of these

Discuss
Answer: (c).increases
Q37.
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 hd K

b.

V = 44.72 K hd

c.

V = 44.72 K hd

d.

V = 44.72 K hd

Discuss
Answer: (d).V = 44.72 K hd
Q38.
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

Discuss
Answer: (c).throat and exit
Q39.
The critical pressure ratio for initially wet steam is

a.

0.546

b.

0.577

c.

0.582

d.

0.601

Discuss
Answer: (c).0.582
Q40.
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

Discuss
Answer: (b).when the cross-section of the nozzle decreases continuously from entrance to exit
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