Power System - II (3150911) MCQs

MCQs of Transients in Power Systems

Showing 71 to 80 out of 106 Questions
5 6 7 8 9 10
71.
Lightning arrester connected between the line and earth in a power system
(a) Protects the terminal equipment against traveling surges
(b) Protects the terminal equipment against direct lightning stroke
(c) Suppresses high-frequency oscillations in the line
(d) Reflects back the traveling waves approaching it
Answer:

Option (a)

72.
Which of the following is a nonlinear diverter?
(a) Expulsion type arresters
(b) Valve type arresters
(c) Electrolytic type arresters
(d) Road gap type arresters
Answer:

Option (b)

73.
The energy of traveling wave is
(a) Absorbed by surge arrester
(b) Reflected by surge arrester
(c) Diverted by surge arrester
(d) Partly absorbed and partly diverted by surge arrester
Answer:

Option (d)

74.
Coupling factor of a ground wire can be increased by
(a) Reducing the footing impedance
(b) Increasing the ground wire size
(c) Using cantilever roads on the crossing along with the arm of ground wire
(d) All of above
Answer:

Option (d)

75.
In lightning arrester, flash over occurs at
(a) 1.2 to 2.5 times arrester rating
(b) 3 to 4.5 times arrester rating
(c) At arrester rating
(d) Below arrester rating
Answer:

Option (b)

76.
In presence of corona, electrostatic coupling and electromagnetic coupling
(a) Decreases, increases
(b) Increases, decreases
(c) Increases, remains same
(d) Remains same, decreases
Answer:

Option (c)

77.
When a transmission line is energized
(a) Voltage wave only propagates on it
(b) Current wave only propagates on it
(c) Both voltage and current waves propagate on it
(d) None of above
Answer:

Option (c)

78.
When a wave propagates on a transmission line, it suffers reflection several times at
(a) Load end
(b) Sending end
(c) Sending end and other end
(d) Tapping point
Answer:

Option (c)

79.
Traveling voltage wave and current wave have the same wave forms and travel together along the transmission line at a velocity
(a) Of sound
(b) Of light
(c) Slightly less than that of light
(d) Slightly less than that of sound
Answer:

Option (c)

80.
The relation between traveling voltage wave and current wave is given as
(a) ei=√(L/C)
(b) e/i=√(L/C)
(c) ei=√(LC)
(d) e/i=√(LC)
Answer:

Option (b)

Showing 71 to 80 out of 106 Questions
5 6 7 8 9 10