Chapter 28

Question 1

The Voltage held by the regulator can be adjusted by

Answer 1

Varying the weight and adjusting the tension of the D.C. Solenoid spring

Question 2

The exciter field rheostat is used to adjust each rheostat element at blank when the generator voltage is at the set point

Answer 2

Mid range

Question 3

When the rheostat change causes the voltage to approach the desired value so rapidly that it will overshoot, the operator must…

Answer 3

Immediately turn the rheostat slightly in the opposite direction

Question 4

This torque motor rotor is linked to the rheostat element so that it’s motion will blank or blank the resistance of the rheostat

Answer 4

Increase or decrease

Question 5

In a rheostat type regulator its secondary connected in series with the…

Answer 5

Torque motor coil and rectifier

Question 6

What is widely used in the main exciter field circuit on large generators using separately excited main exciter sand having line charging requirements

Answer 6

Wheatstone bridge rheostat

Question 7

Dynamic type regulators differ from older regulators because they…

Answer 7

Have a feedback control and electronically controlled separate motor

Question 8

To reduce the exciter field voltage, lower the exciter voltage, and decrease the field current and terminal voltage of the ac machine you must..

Answer 8

Control switch at the on position

Question 9

What tends to prevent the flow of cross currents between paralleled ac machines as well as to insure stable operation of regulators in parallel

Answer 9

Cross current compensation

Question 10

The four general types of automatic voltage regulators are…

Answer 10

Vibrating contact type, rheostat type, dynamic type, and indirect type uses voltage sensing device