GATE EE 1998 | Transformers Question 79 | Electrical Machines

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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

$$230$$ $$V$$

$$460$$ $$V$$

$$115$$ $$V$$

$$65$$ $$V$$

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

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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Network Elements Network Theorems Three Phase Circuits Transient Response Sinusoidal Steady State Analysis Graph Theory Two Port Networks

Electromagnetic Fields

Time Varying Fields Electrostatics Magnetostatics

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Continuous and Discrete Time Signals Linear Time Invariant Systems Continuous Time Signal Fourier Transform Discrete Time Signal Z Transformation Continuous Time Signal Laplace Transform Sampling Theorem Continuous Time Periodic Signal Fourier Series Miscellaneous

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