This set of Basic Electrical Engineering Question Paper focuses on “Mechanical Analogy, Current and Voltage of an Inductive Circuit”.

1. Inductor does not allow sudden changes in?

a) Voltage

b) Current

c) Resistance

d) Inductance

View Answer

Explanation: The inductor does not allow sudden changes in current because if current changes in the inductor occur in zero time, the voltage becomes zero which is not possible.

2. An induced emf is said to be ___________

a) Inductive

b) Capacitive

c) Resistive

d) Cannot be determined

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Explanation: Any circuit in which a change of current is accompanied by a change of flux, and therefore by an induced emf, is said to be inductive.

3. Find the average current in an inductor if the total current in the inductor is 30A.

a) 10A

b) 26A

c) 15A

d) 5A

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Explanation: Average current= I/2.

Substituting the value of I from the equation, average current= 13A.

4. What is the value of current in an inductive circuit when there is no applied voltage?

a) Minimum

b) Maximum

c) Zero

d) Cannot be determined

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Explanation: The current in an inductive circuit is maximum when there is no voltage applied because of the coils of the inductor store electric flux.

5. What is the current in an inductive circuit when the applied voltage is maximum?

a) Infinity

b) Maximum

c) Zero

d) Cannot be determined

View Answer

Explanation: The current in an inductive circuit is zero or minimum when the value of the applied voltage is maximum.

6. In an inductive circuit, the voltage_______ the current?

a) Leads

b) Lags

c) Is greater than

d) Is less then

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Explanation: In a pure inductive circuit the voltage leads the current and the current lags the voltage by a phase difference of 90 degrees.

7. In an inductive circuit, the current________ the voltage?

a) Leads

b) Lags

c) Is greater than

d) Is less then

View Answer

Explanation: In a pure inductive circuit the voltage leads the current and the current lags the voltage by a phase difference of 90 degrees.

8. What is the power in a pure inductive circuit?

a) Maximum

b) Minimum

c) 0

d) Infinity

View Answer

Explanation: The power in a pure inductive circuit is zero because the phase angle is zero, due to which the power factor is zero and hence the power is zero.

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