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) RC2
- (C) RC
- (D) R2C
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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