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?
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