GATE EE 1998 | Transformers Question 82 | Electrical Machines

GATE EE 1998

MCQ (Single Correct Answer)

-0.3

The efficiency of a 100 kVA transform is 0.98 at full as well as at half load. For this transformer at full load the copper loss.

is less than core loss

is equal to core loss

is more than core loss

none of the above

GATE EE 1997

MCQ (Single Correct Answer)

-0.3

The low voltage winding of a $$400/230V,$$ $$1$$-phase, $$50$$ $$Hz$$ transformer is to be connected to a $$25$$ $$Hz,$$ the supply voltage should be

$$230$$ $$V$$

$$460$$ $$V$$

$$115$$ $$V$$

$$65$$ $$V$$

GATE EE 1996

MCQ (Single Correct Answer)

-0.3

Keeping in view the requirement of parallel operation, which of the $$3$$-phase connections given below are possible?

delta-delta to delta-star

delta-delta to star-delta

star-star to delta-star

delta-star to star-delta

GATE EE 1996

MCQ (Single Correct Answer)

-0.3

Auto-transformer is used in transmission and distribution

when operator is not available

when iron losses are to be reduced

when efficiency considerations can be ignored

when the transformation ratio is small

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