# Power Plant Questions and Answers – Pelton Wheel Turbine

This set of Power Plant Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Pelton Wheel Turbine”.

1. For centrifugal pump impeller, what is the maximum value of the vane exit angle?
a) 100 to 150
b) 150 to 200
c) 200 to 250
d) 250 to 300

Explanation: The maximum value of the vane exit angle is 200 to 250.

2. In which turbine the pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner?
a) Impulse turbine
b) Reaction turbine
c) Both Impulse and Reaction turbine
d) None of the mentioned

Explanation: Impulse Turbine is the one in which pressure energy of water is first converted into kinetic energy by means of nozzle kept close to the runner.

3. The pressure of water is atmospheric and remains constant while passing over the runner in __________
a) Impulse turbine
b) Reaction turbine
c) Both Impulse and Reaction turbine
d) None of the mentioned

Explanation: The pressure of water is atmospheric and remains constant while passing over the runner in Impulse Turbine.

4. The energy of water entering the reaction turbine is _______
a) fully the kinetic energy
b) fully the pressure energy
c) partly the pressure energy and partly the kinetic energy
d) unpredictable

Explanation: The energy of water entering the reaction turbine is partly the pressure energy and partly the kinetic energy.

5. Which of the following is an example of impulse turbine?
a) Propeller turbine
b) Francis turbine
c) Kaplan turbine
d) Pelton wheel

Explanation: Pelton Wheel Turbine is an example of impulse Turbine.

6. The runner of __________ turbine always be under pressure of above atmospheric pressure.
a) Turgo
b) Girand
c) Kaplan
d) None of the mentioned

Explanation: The runner of Kaplan turbine always be under pressure of above atmospheric pressure.

7. What is the head of water available at turbine inlet in hydro-electric power plant called?
b) tail race

Explanation: the head of water available at turbine inlet in hydro-electric power plant called Net Head.

8. Gross head is the difference between __________
a) head race and tail race
c) head race and friction losses
d) net head and friction losses

Explanation: Gross head is the difference between head race and tail race.

9. Which of the following hydraulic turbines has a construction given in diagram below?

a) Kaplan turbine
b) Francis turbine
c) Pelton turbine
d) Propeller turbine

Explanation: From the diagram above, it is clear that the turbine shown is a Pelton Wheel Turbine.

10. What is runaway speed of the runner of Pelton wheel?
a) maximum unsafe speed of the runner due to sudden increase in load on turbine
b) minimum safe speed of the runner due to sudden increase in load on turbine
c) maximum unsafe speed of the runner due to sudden decrease in load on turbine
d) minimum safe speed of the runner due to sudden decrease in load on turbine

Explanation: The maximum unsafe speed of the runner due to sudden decrease in load on turbine is called runaway speed of the runner of Pelton wheel.

11. What is the formula for the velocity of water jet at the inlet of turbine?
Where,
H = Net head acting on Pelton wheel
Cv = coefficient of velocity of jet
a) V = Cv((gH)(1/2))
b) V = 2Cv((gH)(1/2))
c) V = Cv((2gH)(1/2))
d) V = 2Cv((gH)(1/2))

Explanation: The relation between the various quantities mentioned above is given by,
V = Cv((2gH)(1/2)).

12. Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.
a) cube of diameter
b) fourth power of diameter
c) diameter
d) square of diameter

Explanation: Power required to drive a centrifugal pump is directly proportional to fourth power of its impeller.

13. In a reaction turbine, the draft tube is used __________
a) to increase the head of water by an amount equal to the height of the runner outlet above the tail race
b) to transport water to downstream
c) to run the turbine full
d) to prevent air to enter the turbine

Explanation: In a reaction turbine, the draft tube is used to increase the head of water by an amount equal to the height of the runner outlet above the tail race.

14. The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is __________
a) high speed with radial flow at outlet
b) slow speed with radial flow at outlet
c) medium speed with radial flow at outlet
d) high speed with axial flow at outlet

Explanation: The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is high speed with axial flow at outlet.

15. Which of the following pump is preferred for flood control and irrigation applications?
a) Reciprocating pump
b) Axial flow pump
c) Mixed flow pump
d) Centrifugal pump

Explanation: Axial flow pump is preferred for flood control and irrigation applications.

Sanfoundry Global Education & Learning Series – Power Plant Engineering.

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