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Transformers – 1 – 2

6. A transformer having 1000 primary turns is connected to a 250-V a.c. supply. For a secondary voltage of 400 V, the number of secondary turns should be :

(a) 1600
(b) 250
(c) 400
(d) 1250

ANSWER

EXPLANATION

7. The primary and secondary induced e.m.fs. E1 and E2 in a two-winding transformer are always :

(a) equal in magnitude
(b) antiphase with each other
(c) in-phase with each other
(d) determined by load on transformer secondary

ANSWER

EXPLANATION

8.  If the primary power of an ideal transformer having a 2:1 voltage ratio is 100 W, the secondary power is :

(a) 50 W
(b) 75 W
(c) 100 W
(d) 200 W

ANSWER

EXPLANATION

9. In performing the short circuit test of a transformer :

(a) high voltage side is usually short circuited
(b) low voltage side is usually short circuited
(c) any side is short circuited with preference
(d) none of the above

ANSWER

EXPLANATION

10. A transformer has negative voltage regulation when its load power factor is :

(a) zero
(b) unity
(c) leading
(d) lagging

ANSWER

EXPLANATION

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