# Gas Turbines Questions and Answers – Dimensionless Performance Parameters

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

1. Dimensional analysis can be used to compare gas turbines.
a) True
b) False

Explanation: Dimensionless analysis can be used to compare gas turbines.

2. Reynolds number is a __________ parameter.
a) constant
b) have dimension
c) dimensionless constant
d) none of the mentioned

Explanation: Reynolds number is a dimensionless parameter.

3. Power is expressed in ___________
a) Horsepower
b) Volts
c) Ohms
d) None of the mentioned

Explanation: Power is expressed in horsepower.

4. Flow coefficient has no _______
a) value
b) dimension
c) flow coefficient is constant
d) none of the mentioned

Explanation: Flow coefficient has no dimension.

5. Pressure coefficient has ___________
a) no value
b) dimension
c) no dimension
d) none of the mentioned

Explanation: Pressure when expressed in dimensionless parameter is called as pressure coefficient.
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6. ____________ when expressed in the form of dimensionless quantity is known as flow coefficient.
a) Flow rate
b) Pressure
c) Flow rate & Pressure
d) None of the mentioned

Explanation: Flow coefficient is a dimensionless quantity.

7. Mach number is a _________ parameter.
a) valued
b) dimensionless
c) valued & dimensionless
d) none of the mentioned

Explanation: Mach number is a dimensionless parameter.

8. Gas constants are classified under ________ dimension groups.
a) quasi
b) uni
c) multiple
d) none of the mentioned

Explanation: Gas constants are classified under quasi dimension groups.

9. Corrected groups are __________ proportional to quasi dimension groups.
a) inversely
b) directly
c) not related
d) none of the mentioned

Explanation: Corrected groups are directly proportional to quasi dimensional groups.

10. Working fluid properties are present in scaling parameter groups.
a) True
b) False

Explanation: Working fluid properties are not present in scaling parameter groups.

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

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