Phasor Algebra Electrical Engineering MCQ Questions Answers
Phasor algebra is a fundamental concept in the field of electrical engineering that plays a crucial role in the analysis of AC (alternating current) circuits. Phasors are complex numbers that represent the amplitude and phase angle of a sinusoidal waveform. Understanding phasor algebra is essential for solving problems related to AC circuit analysis, impedance, and power calculations. In this article, we will delve into a set of Multiple Choice Questions (MCQs) to test and enhance your knowledge of phasor algebra.
1) A current of 3 + j 4 amperes is flowing through a circuit. The magnitude of current is ………
a) 7 A
b) 5 A
c) 1 A
d) 1.33 A
2) In the complex number 4 + j 7, 7 is called the ……… component.
a) real
b) imaginary
c) in-phase
d) quadrature
3) The conjugate of -4 + j 3 is …………
a) 4 – j 3
b) -4 – j 3
c) 4 + j 3
d) none of the above
4) For addition or subtraction of phasors, we use …….. form.
a) polar
b) rectangular
c) trigonometrical
d) none of the above
5) The reciprocal of j is
a) j
b) –j
c) j2
d) none of above
6) In the above problem, circuit power factor is
a) 0.756 lag
b) 0.525 lead
c) 0.625 lag
d) 0.852 lag
7) In the above question, the value of inductance is
a) 0.25 H
b) 0.08 H
c) 1.25 H
d) 0.318 H
8) In the above question, what is the power factor of the circuit ?
a) 0.525 leading
b) 0.803 lagging
c) 0.625 leading
d) 0.325 lagging
9) In the above question, what is the circuit power factor ?
a) 0.707 lag
b) 0.848 lag
c) 0.515 lag
d) 0.432 lag
10) The a.c. power in a load that is conserved is
a) real
b) reactive
c) apparent
d) all above