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Transformers – 1 – 3

11. No-load test on a transformer is carried out to determine :

(a) copper loss
(b) magnetising current
(c) magnetising current and no-load loss
(d) efficiency of the transformer

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

12. The main purpose of performing open-circuit test on a transformer is to measure its :

(a) Cu loss
(b) core loss
(c) total loss
(d) insulation resistance

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

13. Transformers are rated in kVA instead of kW because :

(a) load power factor is often not known
(b) kVA is fixed whereas kW depends on load p.f.
(c) total transformer loss depends on voltampere
(d) it has become customary

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

14. At relatively light loads, transformer efficiency is low because :

(a) secondary output is low
(b) transformer losses are high
(c) fixed loss is high in proportion to the output
(d) Cu loss is small

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

15. The ordinary efficiency of a given transformer is maximum when :

(a) it runs at half full-load
(b) it runs at full-load
(c) its Cu loss equals iron loss
(d) it runs slightly overload

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

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