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Complete Question Bank

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1.  L and C

2.  L and R

3.  C and R

4.  None of these

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Complete Question Bank

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A step-down transformer is employed to reduce the main supply of AC from 220V to 11V. If the primary coil draws a current of 5A and the secondary supplies a current to 90A, then the efficiency of the transformer is

1.  10%

2.  95%

3.  90%

4.  80%

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Complete Question Bank

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At resonance, the value of the power factor of the circuit is

1.  1

2.  Zero

3.  Between zero and 1

4.  More than 1

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

1.

2.

3.

4.

Complete Question Bank + Test Series
Complete Question Bank

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1.  25V

2.  75V

3.  35V

4.  Zero

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Complete Question Bank

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The ratio of the number of secondary to primary in an ideal transformed from 50 to 550. If the power input is P, then its output power is

1.  11P

2.  $\frac{\mathrm{P}}{11}$

3.  $\frac{18\mathrm{p}}{111}$

4.  P

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Complete Question Bank

Difficulty Level:

Loss in energy in the transformer is due to

1.  Hysteresis

2.  Eddy current loss

3.  Leakage of flux

4.  All of these

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Complete Question Bank

Difficulty Level:

1.

2.

3.

4.

Complete Question Bank + Test Series
Complete Question Bank

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In a step-up transformer, the turn ratio is 1: 2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary. The voltage developed in the secondary would be

1. 3.0 v

2. 0.75 v

3. 1.5 v

4. Zero