Chapter 10 hydraulic Turbines Flashcards

1
Q

Which of the following would not be used with a peloton wheel?

A

Wicket gates

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2
Q

Pelton wheels:

A

May use two or more jets per Wheel to obtain increased power

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3
Q

Power available at the nozzles varies

A

Directly with the head and quantity of water

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4
Q

Water hammer:

A

Can damage the penstock, if not, kept within reasonable limits

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5
Q

The purpose of an auxiliary needle is to

A

Providing means for reducing flow to an impulse wheel, rapidly, while reducing the flow slowly through the penstock

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6
Q

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

A

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

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7
Q

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

A

Stripper

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8
Q

For most reaction turbines greatest efficiency is obtained when the wicket gates are

A

80 to 90% open

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9
Q

A draft tube:

A

Increases the effective head of the turbine

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10
Q

Readings from a pressure gauge on the crown plate of your reaction Turbine give a good indication of the

A

Seal ring effectiveness

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11
Q

A Kaplan turbine;

A

Propeller blades, adjust automatically to maintain best efficiency for gate position and variations in head

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12
Q

Net head most nearly means:

A

Gross or static head less the frictional losses in feet

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13
Q

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

A

Little or no variation in effective head

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14
Q

How much head would be required to develop 10,000 hp from a turbine operating at 80% efficiency from a stream with the flow of 100 ft.³ per second

A

1100 feet

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15
Q

What is the best speed of rotation in RPM for a peloton wheel 54 inches in diameter on which the net head is 625 feet?

A

360 rpm

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