# Turbo Machines - Mechanical Engineering (MCQ) questions and answers

Dear Readers, Welcome to Turbo Machines multiple choice questions and answers with explanation. These objective type Turbo Machines questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.

Specially developed for the Mechanical Engineering freshers and professionals, these model questions are asked in the online technical test and interview of many companies.

These tutorial are also important for your viva in university exams like Anna university, Pune, VTU, UPTU, CUSAT etc.

1)   What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)?
- Published on 16 Sep 15

d. Unpredictable
 Answer  Explanation  Related Ques ANSWER: Blade loading coefficient (Ψ) decreases Explanation: No explanation is available for this question!

2)   What is the formula for blade loading coefficient (Ψ) for an axial flow compressor?

Where,
W = Workdone
Cf = Axial flow velocity
Cb = Blade velocity

- Published on 16 Sep 15

a. Ψ = W / (Cf)2
b. Ψ = (Cf)2 / W
c. Ψ = W / (Cb)2
d. Ψ = (Cb)2 / W
 Answer  Explanation  Related Ques ANSWER: Ψ = W / (Cb)2 Explanation: No explanation is available for this question!

3)   What is the effect of increasing number of stages in axial flow compressor on the mean work input factor (Ψw)?
- Published on 16 Sep 15

a. Mean work input factor (Ψw) decreases
b. Mean work input factor (Ψw) increases
c. Mean work input factor (Ψw) remains constant
d. Unpredictable
 Answer  Explanation  Related Ques ANSWER: Mean work input factor (Ψw) decreases Explanation: No explanation is available for this question!

4)   What is the ratio of the actual work absorbed by an axial flow compressor to the theoretical work called?
- Published on 16 Sep 15

a. Work input factor
b. Workdone factor
c. Both a. and b.
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Both a. and b. Explanation: No explanation is available for this question!

5)   ___________ can be defined as the ratio of the pressure rise in rotor blades to the pressure rise in stages in an axial flow compressor.
- Published on 16 Sep 15

a. Degree of pressure
b. Degree of reaction
c. Pressure ratio
d. Reaction ratio
 Answer  Explanation  Related Ques ANSWER: Degree of reaction Explanation: No explanation is available for this question!

6)   What is the ratio of isentropic work to Euler work in an centrifugal compressor called?
- Published on 16 Sep 15

a. Work coefficient
b. Velocity coefficient
c. Pressure coefficient
d. Flow coefficient
 Answer  Explanation  Related Ques ANSWER: Pressure coefficient Explanation: No explanation is available for this question!

7)   The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________.
- Published on 16 Sep 15

a. velocity factor
b. slip factor
c. work factor
d. none of the above
 Answer  Explanation  Related Ques ANSWER: slip factor Explanation: No explanation is available for this question!

8)   The diffuser blades are kept ______ the number of impeller blades .
- Published on 16 Sep 15

a. 1/10 th of
b. 1/3 rd of
c. 10 times
d. 3 times
 Answer  Explanation  Related Ques ANSWER: 1/3 rd of Explanation: No explanation is available for this question!

9)   Vaneless diffusers are suitable for ___________.
- Published on 16 Sep 15

a. only low pressure rise
b. only high pressure rise
c. both low as well as high pressure rise
 Answer  Explanation  Related Ques ANSWER: only low pressure rise Explanation: No explanation is available for this question!

10)   Angular momentum of gas in the free vortex of vaneless diffuser ___________.
- Published on 16 Sep 15

a. increases
b. decreases
c. remains constant
d. becomes unpredictable
 Answer  Explanation  Related Ques ANSWER: remains constant Explanation: No explanation is available for this question!

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