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

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 the rotor?

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

(e) Explain why Zambia electricity supply corporation limited uses back to back no-load test. Draw the circuit diagram for that arrangement.

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

1. Output voltage, transient and steady

2. Power dissipated and output

3. Usefulness compared to AC input

Solutions

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