# Practice Test: Question Set - 03

**1. Which of the following refers to a parallel circuit?**

- (A) The current through each element is same

- (B) The voltage across element is in proportion
to it's resistance value

- (C) The equivalent resistance is greater than
any one of the resistors

- (D) The current through any one element is less
than the source current

**2. The frequency of domestic power supply in India is**

- (A) 200 Hz

- (B) 100 Hz

- (C) 60 Hz

- (D) 50 Hz

**3. The frequency of an alternating current is**

- (A) The speed with which the alternator runs

- (B) The number of cycles generated in one minute

- (C) The number of waves passing through a point
in one second

- (D) The number of electrons passing through a
point in one second

**4. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will**

- (A) Be reduced by half

- (B) Be doubled

- (C) Be four times as high

- (D) Be reduced to one fourth

**5. A sine wave has a frequency of 50 Hz. Its angular frequency is _______ radian/second.**

- (A) 100 n

- (B) 50 jt

- (C) 25 JT

- (D) 5 n

**6. Two waves of the same frequency have opposite phase when the phase angle between them is**

- (A) 360°

- (B) 180°

- (C) 90°

- (D) 0°

**7. In a pure inductive circuit**

- (A) The current is in phase with the voltage

- (B) The current lags behind the voltage by 90°

- (C) The current leads the voltage by 90°

- (D) The current can lead or lag by 90°

**8. The time constant of a series R-C circuit is given by**

- (A) R/C

- (B) RC

^{2}

- (C) RC

- (D) R

^{2}C

**9. A heater is rated as 230 V, 10 kW, A.C. The value 230 V refers to**

- (A) Average voltage

- (B) r.m.s. voltage

- (C) Peak voltage

- (D) None of the above

**10. Apaporis**

- (A) A line which represents the magnitude and
phase of an alternating quantity

- (B) A line representing the magnitude and direction of
an alternating quantity

- (C) A colored tag or band for distinction between
different phases of a 3-phase supply

- (D) An instrument used for measuring phases of
an unbalanced 3-phase load

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