Top 80+ Solved Power Quality and Management MCQ Questions Answer
Q. Non-sinusoidal waveforms are made of
a. different sinusoidal waveforms
b. fundamental and even harmonics
c. fundamental and odd harmonics
d. even and odd harmonics only
Q. The positive and negative halves of a complex wave are symmetrical when
a. it contains even harmonics
b. phase difference between even harmonics and fundamentals is 0 or it
c. it contains odd harmonics
d. phase difference between even harmonics and fundamental is either n/2 or 3n/2
Q. The rms value of the complex voltage given by v = 161i sin cot + 12 Ari sin Rot is
a. 20 Ari
b. 20
c. 28
d. 192
Q. Two complex waves will have the same wave-shape if
a. they contain the same harmonics
b. ratio of corresponding harmonics to their respective fundamentals is the same
c. harmonics are similarly spaced with respect to their fundamental
d. they have all of the above
Q. The trigonometric Fourier series for a complex wave will contain positive cosineterms only when
a. it contains even harmonics
b. its two half-cycles are symmetrical
c. its value is zero at 0= n/2, 3n/2 et
d. its value is zero at 0= n, 2n etc.
Q. Tansient disturbance is produced in a circuit whenever
a. it is suddenly connected or discon nected from the supply
b. it is shorted
c. its applied voltage is changed suddenly
d. all of the above
Q. There are no transients in pure resistive circuits because they
a. offer high resistance
b. obey Ohm's law
c. have no stored energy
d. are linear circuits
Q. Transient current in electrical circuits are associated with
a. inductors
b. capacitors
c. resistors
d. both (a) and (b)
Q. The transients which are produced due to sudden but energetic changes from onesteady state of a circuit to another are called transients.
a. initiation
b. transition
c. relaxation
d. subsidence
Q. In an R-L circuit connected to an alternating sinusoidal voltage, size of transient current primarily depends on
a. the instant in the voltage cycle at which circuit is closed
b. the peak value of the steady-state current
c. the circuit impedance
d. the voltage frequency
Q. Double-energy transients are produced in circuits consisting of
a. two or more resistors
b. resistance and inductance
c. resistance and capacitance
d. resistance, inductance and capacitance
Q. The transient current in a loss-free L-C circuit when excited from an ac source isa/an sine wave.
a. over-damped
b. undamped
c. under-damped
d. critically damped
Q. For measuring positive, negative and zero sequence voltages in a system, thereference is taken as :
a. Neutral of the system only
b. Ground only
c. For zero sequence neutral and for positive and negative the ground
d. None of the above