Answer: Cc = √(ηn)

Advertisement

Advertisement

Questions

1
What is the relation between Velocity Coefficient (Cc) and Nozzle efficiency (ηn)?

Answer: Cc = √(ηn)

2
The ratio of actual mass flow rate (ṁa) to ideal mass flow rate (ṁi) is called as________

Answer: coefficient of discharge

Advertisement

3
The blade speed ratio of impulse turbine is given as ___________

Answer: (Blade velocity) / (Steam velocity at inlet)

4
Discharge capacity of the reciprocating pump is __________ that of the centrifugal pump.

Answer: lower than

5
Which pump is more suitable for an application where very high pressure is required to be developed at moderate discharge?

Answer: Reciprocating pump

6
The process of filling the liquid into the suction pipe and pump casing upto the level of delivery valve is called as _________.

Answer: priming

7
The volute pumps and vortex volute pumps are __________ pumps with _________ shaft.

Answer: single stage, horizontal

8
Which of the following centrifugal pumps has higher specific speed than the others?

Answer: Axial flow

9
Angular momentum of gas in the free vortex of vaneless diffuser ___________.

Answer: remains constant

11
The diffuser blades are kept ______ the number of impeller blades .

Answer: 1/3 rd of

12
The ratio of actual whirl velocity to the ideal whirl velocity in the centrifugal compressor is called as _________.

Answer: slip factor

13
What is the ratio of isentropic work to Euler work in an centrifugal compressor called?

Answer: Pressure coefficient

14
___________ can be defined as the ratio of the pressure rise in rotor blades to the pressure rise in stages in an axial flow compressor.

Answer: Degree of reaction

15
What is the ratio of the actual work absorbed by an axial flow compressor to the theoretical work called?

Answer: Both a. and b.

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

Answer: Mean work input factor (Ψw) decreases

17
What is the effect of increasing flow coefficient (Φ) in an axial flow compressor on blade loading coefficient (Ψ)?

Answer: Blade loading coefficient (Ψ) decreases

18
What is the formula for blade loading coefficient (Ψ) for an axial flow compressor?
Where,
W = Workdone
Cf = Axial flow velocity
Cb = Blade velocity

Answer: Ψ = W / (Cb)2

19
In reaction turbine work is done_______________.

Answer: mostly due to change in pressure head and small amount of work is due to change in kinetic energy

20
In which type of turbine, the runner needs to be run full of water?

Answer: Reaction turbine

Advertisement