GATE EE 1998 | Transformers Question 84 | 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 1998

MCQ (Single Correct Answer)

-0.3

The laws of electromagnetic induction (Faraday's and Lenz's law) are summarized in the following equation:

e = iR

$$\mathrm e\;=\;\mathrm L\frac{\operatorname d\mathrm i}{\operatorname d\mathrm t}$$

$$\mathrm e\;=\;-\frac{\operatorname d\mathrm\psi}{\operatorname d\mathrm t}$$

none of these

GATE EE 1998

MCQ (Single Correct Answer)

-0.3

The magnetizing current in a transformer is rich in

3^rd harmonic

5^th harmonic

7^th harmonic

13^th harmonic

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

$$230$$ $$V$$

$$460$$ $$V$$

$$115$$ $$V$$

$$65$$ $$V$$

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