Steam Turbines Questions and Answers – Effect of Compressibility

This set of Steam and Gas Turbines Multiple Choice Questions & Answers (MCQs) focuses on “Effect of Compressibility”.

1. When mach number is less than 1 flow is __________
a) Subsonic flow
b) Transonic flow
c) Supersonic flow
d) None of the mentioned

Explanation: For subsonic flow mach number is always less than one.

2. When mach number is equal to one then the flow is ___________
a) Subsonic flow
b) Transonic flow
c) Supersonic flow
d) None of the mentioned

Explanation: For transonic flow mach number is equal to one.

3. When mach number is greater than one flow is ___________
a) Subsonic flow
b) Transonic flow
c) Supersonic flow
d) None of the mentioned

Explanation: For supersonic flow mach number is always greater than one.

4. For subsonic flow density varies relatively.
a) True
b) False

Explanation: For subsonic flow density is relatively constant.

5. For transonic flow density change is ________ velocity change.
a) equal to
b) more than
c) less than
d) none of the mentioned

Explanation: For transonic flow density change is almost equal to velocity change.

6. For supersonic flow density changes ___________ velocity change.
a) faster than
b) slower than
c) equal to
d) none of the mentioned

Explanation: For supersonic flow density change is faster than velocity change.

7. In a supersonic flow density change is faster than velocity change by a factor of _________
a) Mach number
b) Square of mach number
c) Cube of mach number
d) None of the mentioned

Explanation: In supersonic flow density change is greater than velocity change by a factor of square of mach number.

8. For compressible flow mach number must be ____________ 0.3.
a) less than
b) equal to
c) greater than
d) none of the mentioned

Explanation: For compressible flow mach number should be greater than 0.3.

9. When normal shock waves occurring at an angle ____________ 90 degree then they are called as bow shock.
a) less than
b) greater than
c) equal to
d) none of the mentioned

Explanation: When normal shock waves occurring at an angle less than 90 degree they are called as oblique shock waves.

10. When oblique shock _________ the flow it is called as a bow shock.
a) detached from
c) minimizes
d) none of the mentioned

Explanation: Due to flow conditions oblique shock may be attached or detached with flow, When oblique shock wave is detached with the flow it forms a bow shock.

Sanfoundry Global Education & Learning Series – Steam and Gas Turbines.

To practice all areas of Steam and Gas Turbines, here is complete set of 1000+ Multiple Choice Questions and Answers.

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