GATE EE 1998 | Transformers Question 87 | Electrical Machines

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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 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

The function of oil in a transformer is

to provide insulation and cooling

to provide protection against lightning

to provide protection against short circuit

to provide lubrication

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

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