21. A lossless transmission line having Surge Impedance Loading(SIL) of 2280 MW is provided with a uniformly distributed series capacitive compensation of 30% .Then SIL of the compensated transmission line will be
a) 1835 MW
b) 2280 MW
c) 2725 MW
d) 3257 MW
ans. b
22. Out of considerations listed below
1. no distance limitation related to steady-state stability
2. no reactive power requirement from the system at the two terminals
3. no substantial effect on fault level of the two systems at the terminals inspite of the interconnection
4. no corona problems
a) all the above
b) 1 and 3
c) 3 and 4
d) 2 and 4
ans. a
23. In a dc transmission line
a) it is necessary for the sending end and receiving end to be operated in synchronism.
b) the effects of inductive and capacitive reactances are greater than in an ac transmission line of the same rating.
c) there are no effects due to inductive and capacitive reactances
d) power transfer capability is limited by stability considerations.
ans. c
24. HVDC transmission is preferred to EHV AC because
a) HVDC terminal equipment are inexpensive
b) VAR compensation is not required in HVDC system
c) system stability can be improved
d) harmonics problem is avoided
ans. c
25. High Voltage DC (HVDC) transmission is mainly used for
a) bulk power transmission over very long distances.
b) interconnecting two systems with the same nominal frequency .
c) eliminating reactive power requirement in the operation.
d) minimizing harmonics at the converter stations.
ans. a
26. Choose the appropriate auxiliary components of HVDC transmission system from the following
1. DC line inductor .
2. AC line inductor .
3. Reactive power sources.
4. Distance relays on dc line.
5. Series capacitance on AC line.
a) 1 and 2
b) 1 and 3
c) 2 and 4
d) 4 and 5
ans. b
27. Bulk power transmission over long HVDC lines are preferred an account of
a) low cost HVDC terminals.
b) no harmonic problems
c) minimum line power losses
d) simple protection
ans. c
29. An HVDC link consists of rectifier, inverter , transmission line and other equipments. Which one of the following is true for this link?
a) The transmission line produces/supplies reactive power.
b) The rectifier consumes reactive power and the inverter supplies reactive power from /to the respective connected ac systems
c) Rectifier supplies reactive power and the inverter consumes reactive power to/from the respective connected ac systems.
d) Both converters (rectifier and inverter) consume reactive power from the respective connected ac systems.
ans. b
a) 1835 MW
b) 2280 MW
c) 2725 MW
d) 3257 MW
ans. b
22. Out of considerations listed below
1. no distance limitation related to steady-state stability
2. no reactive power requirement from the system at the two terminals
3. no substantial effect on fault level of the two systems at the terminals inspite of the interconnection
4. no corona problems
a) all the above
b) 1 and 3
c) 3 and 4
d) 2 and 4
ans. a
23. In a dc transmission line
a) it is necessary for the sending end and receiving end to be operated in synchronism.
b) the effects of inductive and capacitive reactances are greater than in an ac transmission line of the same rating.
c) there are no effects due to inductive and capacitive reactances
d) power transfer capability is limited by stability considerations.
ans. c
24. HVDC transmission is preferred to EHV AC because
a) HVDC terminal equipment are inexpensive
b) VAR compensation is not required in HVDC system
c) system stability can be improved
d) harmonics problem is avoided
ans. c
25. High Voltage DC (HVDC) transmission is mainly used for
a) bulk power transmission over very long distances.
b) interconnecting two systems with the same nominal frequency .
c) eliminating reactive power requirement in the operation.
d) minimizing harmonics at the converter stations.
ans. a
26. Choose the appropriate auxiliary components of HVDC transmission system from the following
1. DC line inductor .
2. AC line inductor .
3. Reactive power sources.
4. Distance relays on dc line.
5. Series capacitance on AC line.
a) 1 and 2
b) 1 and 3
c) 2 and 4
d) 4 and 5
ans. b
27. Bulk power transmission over long HVDC lines are preferred an account of
a) low cost HVDC terminals.
b) no harmonic problems
c) minimum line power losses
d) simple protection
ans. c
29. An HVDC link consists of rectifier, inverter , transmission line and other equipments. Which one of the following is true for this link?
a) The transmission line produces/supplies reactive power.
b) The rectifier consumes reactive power and the inverter supplies reactive power from /to the respective connected ac systems
c) Rectifier supplies reactive power and the inverter consumes reactive power to/from the respective connected ac systems.
d) Both converters (rectifier and inverter) consume reactive power from the respective connected ac systems.
ans. b
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