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MACHINES ONE LAB TEST QUESTIONS. QUESTION 1. (a) Why are the exciters poles in DC machines broad...

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Electrical Engineering

MACHINES ONE LAB TEST QUESTIONS.

QUESTION 1.

(a) Why are the exciters poles in DC machines broad ended?

(b) Why is the armature of a DC machine always made to be therotor?

(c) Give three main advantages of transformers no load andshort-circuit tests. Include circuit diagrams

(d) Explain why the short-circuit test is said to help determinethe full-load copper losses. Use elaborate labelled diagram as wellas formulas in your explanation.

(e) Explain why Zambia electricity supply corporation limiteduses back to back no-load test. Draw the circuit diagram for thatarrangement.

(f) A 220V/12V transformer is supplied from a car battery on itssecondary side. Explain the behaviour of the machine in termsof:

1. Output voltage, transient and steady

2. Power dissipated and output

3. Usefulness compared to AC input

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