# ONLINE MCQ EE AND ECE-A.C. Fundamentals, Circuits and Circuit Theory Part Three

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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