31- Switching Overvoltage is an: a- Internal fault. b- External fault. C- Unbalance fault. d- All the above answers are wrong.

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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26- If we have a multi - stage impulse generator with a highest charging voltage ( Vrms)
of 115.475 KV & a discharge capacitance of the generator ( Cg) of 1 microfarad. If
we need to generate a high voltage of 7.07107 MV (r.m.s): 1) What is the number of
stages? ? 2) What is the energy of this generator
a- 5 stage, 200 KJ.
b- 4 stage, 200 KJ.
C50 stage, 20KJ.
d- All these answers are wrong.
27- For economic consideration, we -13 prefer to use HVDC Transmission than using
HVAC Transmission when the distance of the transmission line
a- Equal to 280 km.
b- Under than 300 km.
C- Greater than 300 km. .
d- Between 50 to 500 km.
e-
28- The working stress of the d.c. cable-3 insulation may be
a- 2 to 3 times higher than under a.c
b- .4 to 5 times higher than under a.c.
C 3 to 4 times higher than under a.c. .
1 to 2 times higher than under a.c.
d-
29- The most dangerous/short circuit fault that increases the voltage (overvoltage) on
the other lines is:
a- Single line to earth.
b- Two line to earth.
C- Three line to earth.
d- Three line to line.
30- The HVDC system has a lower line cost per unit length as compared to an equally
reliable a.c. system due to :
a- The lesser number of conductors and smaller tower size.
b- The higher number of conductors and larger tower size.
The lesser number of conductors and larger tower size.
d- All the above answers are wrong.
31- Switching Overvoltage is an:
a-Internal fault.
b- External fault.
C-
C- Unbalance fault.
d- All the above answers are wrong.
32- The Direct lightening has more dangerous effect than Indirect one because
a It hit the line directly. So it has direct effect and greater lightening current.
b- It hit the line Indirectly. So it has indirect effect and greater lightening current.
C- due to the electrostatic shielding, it has no effect.
d- All the above answers are wrong
33- To carry the same current the cable conductor must have a much smaller resistance
per - unit length than the overhead conductor, and therefore, it will have a much
greater a cost.
a- To be able to sink the overheat temperature from the conductors than
insulators to atmosphere.
b- To be able to dissipate the overheat temperature from the conductors than
insulators to atmosphere.
c- To reduce the voltage losses of the conductors.
d- All of the above answers are wrong
Transcribed Image Text:26- If we have a multi - stage impulse generator with a highest charging voltage ( Vrms) of 115.475 KV & a discharge capacitance of the generator ( Cg) of 1 microfarad. If we need to generate a high voltage of 7.07107 MV (r.m.s): 1) What is the number of stages? ? 2) What is the energy of this generator a- 5 stage, 200 KJ. b- 4 stage, 200 KJ. C50 stage, 20KJ. d- All these answers are wrong. 27- For economic consideration, we -13 prefer to use HVDC Transmission than using HVAC Transmission when the distance of the transmission line a- Equal to 280 km. b- Under than 300 km. C- Greater than 300 km. . d- Between 50 to 500 km. e- 28- The working stress of the d.c. cable-3 insulation may be a- 2 to 3 times higher than under a.c b- .4 to 5 times higher than under a.c. C 3 to 4 times higher than under a.c. . 1 to 2 times higher than under a.c. d- 29- The most dangerous/short circuit fault that increases the voltage (overvoltage) on the other lines is: a- Single line to earth. b- Two line to earth. C- Three line to earth. d- Three line to line. 30- The HVDC system has a lower line cost per unit length as compared to an equally reliable a.c. system due to : a- The lesser number of conductors and smaller tower size. b- The higher number of conductors and larger tower size. The lesser number of conductors and larger tower size. d- All the above answers are wrong. 31- Switching Overvoltage is an: a-Internal fault. b- External fault. C- C- Unbalance fault. d- All the above answers are wrong. 32- The Direct lightening has more dangerous effect than Indirect one because a It hit the line directly. So it has direct effect and greater lightening current. b- It hit the line Indirectly. So it has indirect effect and greater lightening current. C- due to the electrostatic shielding, it has no effect. d- All the above answers are wrong 33- To carry the same current the cable conductor must have a much smaller resistance per - unit length than the overhead conductor, and therefore, it will have a much greater a cost. a- To be able to sink the overheat temperature from the conductors than insulators to atmosphere. b- To be able to dissipate the overheat temperature from the conductors than insulators to atmosphere. c- To reduce the voltage losses of the conductors. d- All of the above answers are wrong
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