PHEP 11

Question 1

The compensating dashpot serves to prevent over travel or hunting of the gates by re-centering the:

Answer 1

Pilot valve

Question 2

Compensating dashpot is inserted in the:

Answer 2

Restoring mechanism

Question 3

The hydraulic governors must maintain a balance between:

Answer 3

The water input to the turbines and the power requirements on the system

Question 4

The rate at which the small plunger of the compensating dashpot returns to normal is usually determined by the:

Answer 4

Needle valve

Question 5

An isochronous governor is one that has:

Answer 5

Zero speed droop

Question 6

Governor safety devices usually serve to:

Answer 6

Close the gates if the speed exceeds a predetermined value, shut the gates if the governor oil pressure drops and prevent water hammer damage by opening auxillary nozzles if the main nozzle closes too rapidly

Question 7

Adjustment is provided in the speed adjustment linkage to cause the governor to add speed adjustment. The lower direction as the gates open wider. This adjustment is called:

Answer 7

Speed droop

Question 8

Any change in the position of the flyballs is transmitted to the pilot valve by the:

Answer 8

Speeder rod

Question 9

The governors of units designated to regulated system frequency will generally have speed droop setting closer to:

Answer 9

0%

Question 10

Governor setting and response must take into consideration:

Answer 10

Allowable loading of transmissions lines, maximum loading of tie lines between system, hydraulic characteristics of the penstock and turbine and flywheel effect of the rotating mass of the turbine and generator.