V Read the text again to decide if the sentences are true or false.

1 The ac/dc hydraulic motor-driven generators consist of a hydraulically driven

ac/dc generator only.

2 The motor-generator provides 135-/400-volt three-phase ac.

3 The KVA rating of this emergency generator is much lower than the primary

generator(s).

4The motor-generator control provides voltage regulation for, and fault detection

of, motor-generator input.

5When the motor-generator is operating, PMG power flows to the rectifier, where

the three-phase dc is rectified to ac a signal.

6 The ac signal is for control panel and relay control power.

7 The signal then flows to the voltage regulator section of the motor-generator

control unit.

8The voltage regulator supplies field excitation to the motor-generator and

monitors the output voltage.

9Monitoring protective circuits in the motor-generator control prevents out-of-

tolerance power from being connected to the essential bus system.

VI Skimthe text with your partner ask and answer the questions.

1 Why can the hydraulic driven emergency generator only power a small number

of circuits?

2 What causes the rotor in the generator to turn?

3 What helps to maintain generator output frequency?

4 How is the generator cooled?

5 What is the purpose of the motor-generator control?

6 What is the function of the solenoid control valve?