Question No. 3521. For power factor correction, synchronous motors operate at (a) normal load with zero excitation (b) no-load and under-excited fields (c) normal load with minimum excitation (d) no-load and greatly over-excited fields Answer: (d) no-load and greatly over-excited fields Question No. 3522. The field coils of D.C. generator are usually made of (a) copper (b) mica (c) cast iron (d) carbon Answer: (a) copper Question No. 3523. An amplidyne can give which of the following characteristics ? (a) Constant current (b) Constant current, constant voltage and constant power (c) Constant current as well as constant voltage
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