Phep 10

Question 1

Which of the following would not be used with a pelton wheel

Answer 1

Wicket Gates

Question 2

Pelton wheels

Answer 2

.

Question 3

Power available at the nozzle varies

Answer 3

Directly with the head and gravity of water

Question 4

Water hammer

Answer 4

Can damage a penstock if not kept within reasonable limits

Question 5

The purpose of an auxiliary needle is to

Answer 5

Provide a means of reducing flow to an impulse wheel rapidly while reducing the flow more slowly through the penstock

Question 6

To deliver the same amount of power, a smaller diameter runner is required for a reaction turbine than for an impulse wheel because

Answer 6

The entire circumference of the runner of the reaction turbine is being acted on by water steam

Question 7

Which of the following would not be found on a reaction turbine

Answer 7

Stripper

Question 8

For most reaction turbine, greatest efficiency is obtained when the wicket gates are?

Answer 8

80% - 90% open

Question 9

A draft tube

Answer 9

Increases the effective head of the turbine

Question 10

Readings for the pressure gauge on the crown plate of a reaction turbine give a good indication on the

Answer 10

Seal ring effectiveness

Question 11

A Kaplan turbine

Answer 11

Propellor adjusts automatically to maintain best efficiency for gate positions and variations in head

Question 12

Net head most nearly means

Answer 12

Gross or static head less the frictional losses in feet

Question 13

Which of the below factors would not generally contribute to cavitation damage?

Answer 13

Little or no variation in effective head

Question 14

How much head would be required to develop 10,000 HP from a turbine operating at 80% efficiency from a stream with a flow of 100 cuft/sec

Answer 14

1100 ft

Question 15

What is the best speed of rotation in rpm for a pelton wheel 54 inches in diameter, on which the net head is 625ft?

Answer 15

360 rpm