**1. For the same peak value, which of the following
wave has the least mean value?**

- (A) Half wave rectified sine wave

- (B) Triangular wave

- (C) Sine wave

- (D) Square wave

**2. The phase difference between voltage and
current wave through a circuit element is given as 30°. The essential condition
is that**

- (A) Both waves must have same frequency

- (B) Both waves must have identical peak values

- (C) Both waves must have zero value at the same

time

- (D) None of the above

**3. The square waveform of current has following
relation between r.m.s. value and average value.**

- (A) r.m.s. value is equal to average value

- (B) r.m.s. value of current is greater than

average value

- (C) r.m.s. value of current is less than average

value

- (D) None of the above

**4. Time constant of an inductive circuit**

- (A) Increases with increase of inductance and decrease

of resistance

- (B) Increases with the increase of inductance and the

increase of resistance

- (C) Increases with the decrease of inductance and

decrease of resistance

- (D) Increases with decrease of inductance and increase

of resistance

**5. In AC. circuits, laminated iron is
invariably used in order to**

- (A) Reduce eddy current loss

- (B) Increase heat radiation

- (C) Make assembly cheap and easier

- (D) Reduce circuit permeability

**6. At __________ frequencies the parallel R-L circuit
behaves as purely resistive.**

- (A) Low

- (B) Very low

- (C) High

- (D) Very high

**7. When an alternating current passes through
an ohmic resistance the electrical power converted into heat is**

- (A) Apparent power

- (B) True power

- (C) Reactive power

- (D) None of the above

**8. Power factor of an electrical circuit is
equal to**

- (A) R/Z

- (B) Cosine of phase angle difference between current

and voltage

- (C) Ratio of useful current to total current

*Iw*/

*I*

- (D) All above

**9. In a purely inductive circuit**

- (A) Actual power is zero

- (B) Reactive power is zero

- (C) Apparent power is zero

- (D) None of above is zero

**10. Time constant of an inductive circuit**

- (A) Increases with increase of inductance and decrease

of resistance

- (B) Increases with the increase of inductance

and the increase of resistance

- (C) Increases with decrease of inductance and

decrease of resistance

- (D) Increases with decrease of inductance and increase

of resistance

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