Power Quality and Management (2180911) MCQs

MCQs of Electrical Transients

Showing 21 to 30 out of 33 Questions
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21.
The parallel connection of L-C can not produce resonance under every circumstances.
(a) True
(b) False
Answer:

Option (b)

22.
Oscillatory response may present in __________
(a) DC System
(b) AC System
(c) AC & DC both system
(d) AC system having frequency is 50 Hz
Answer:

Option (c)

23.
In a power system the natural frequencies are high when the values of L is ______and C is ___________
(a) low, low
(b) high, low
(c) low, high
(d) high, high
Answer:

Option (a)

24.
The resistance of the various components that make up the power system is also high at the higher frequencies due to the
(a) damping effect
(b) corona effect
(c) harmonics effect
(d) skin effect
Answer:

Option (d)

25.
The wavelength of a periodic waveform is given by _________. where C is the velocity of light in vacuum and f is frequency.
(a) C/f
(b) C x f
(c) f / C
(d) 1 / [C x f]
Answer:

Option (a)

26.
In the power system, the characteristic impedance depends on
(a) R and L
(b) L and C
(c) R and C
(d) R, L and C
Answer:

Option (b)

27.
Resonance in a _________ circuit is characterized by high impedance at the resonant frequency
(a) parallel
(b) series
Answer:

Option (a)

28.
Transformers draw inrush currents that range between _____ and _____ times their normal full-load current
(a) 5, 10
(b) 10, 15
(c) 15, 20
(d) 20, 25
Answer:

Option (b)

29.
Alternating current motors draw starting currents that vary between approx, ________% and _______% of the normal full-load running current
(a) 400, 500
(b) 600,700
(c) 500, 600
(d) 300, 400
Answer:

Option (c)

30.
Data and signal wires that run near power cables should be contained in metal conduits made of
(a) Copper
(b) Aluminium
(c) Brass
(d) Steel
Answer:

Option (d)

Showing 21 to 30 out of 33 Questions
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