Steam and Gas Turbines Multiple Choice Questions on “Dimensionless Performance Parameters”.
1. Dimensional analysis can be used to compare gas turbines.
a) True
b) False
Answer: a
Clarification: 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
Answer: c
Clarification: Reynolds number is a dimensionless parameter.
3. Power is expressed in ___________
a) Horsepower
b) Volts
c) Ohms
d) None of the mentioned
Answer: a
Clarification: Power is expressed in horsepower.
4. Flow coefficient has no _______
a) value
b) dimension
c) flow coefficient is constant
d) none of the mentioned
Answer: b
Clarification: Flow coefficient has no dimension.
5. Pressure coefficient has ___________
a) no value
b) dimension
c) no dimension
d) none of the mentioned
Answer: c
Clarification: Pressure when expressed in dimensionless parameter is called as pressure coefficient.
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
Answer: a
Clarification: Flow coefficient is a dimensionless quantity.
7. Mach number is a _________ parameter.
a) valued
b) dimensionless
c) valued & dimensionless
d) none of the mentioned
Answer: b
Clarification: 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
Answer:a
Clarification: 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
Answer: b
Clarification: Corrected groups are directly proportional to quasi dimensional groups.
10. Working fluid properties are present in scaling parameter groups.
a) True
b) False
Answer: b
Clarification: Working fluid properties are not present in scaling parameter groups.