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The synchronous machine is operating at a normal condition at the generating system, then the angle between rotor axis and the stator magnetic axis is ___________
a
a
See lessIt is required to implement the HVDC system using the thyristors in large numbers. Why it becomes necessary to use a large number of thyristor switches?
a Explanation: Thyristors have low voltage rating and to achieve high voltage, a series of switches that have to used.
a
See lessExplanation: Thyristors have low voltage rating and to achieve high voltage, a series of
switches that have to used.
As compared to the HVDC line, the corona and radio interference in a HVAC line are ____
a Explanation: The corona and radio interference losses are more in ac system.
a
See lessExplanation: The corona and radio interference losses are more in ac system.
(i) Low short circuit current is required in dc system (ii) Fast control of the converter switches cannot effectively control the damping of the oscillations. Choose the most appropriate.
b Explanation: It’s an advantage the using converters in dc link can control the fast damping of the oscillations which occur in ac systems.
b
See lessExplanation: It’s an advantage the using converters in dc link can control the fast
damping of the oscillations which occur in ac systems.
Steady state problem is not very serious problem in dc transmission line system due to which of the following systems?
a Explanation: Due to all the above reasons, mainly the reactive power compensation there is very less variation in stability.
a
See lessExplanation: Due to all the above reasons, mainly the reactive power compensation
there is very less variation in stability.
Which of the system would require more insulation, a 400 kV ac line or 400 kV dc line?
a Explanation: In ac system, the peak value attained will be 400*√2= 564 kV.
a
See lessExplanation: In ac system, the peak value attained will be 400*√2= 564 kV.
Screened type cables have _____ possibilities of core to core faults when compared to belted type cables.
a Explanation: Because metal sheathed core has greater core to core thickness for a given diameter.
a
See lessExplanation: Because metal sheathed core has greater core to core thickness for a
given diameter.
SL type cables, over H-type cables have advantage of mostly ___________
b Explanation: Lesser tendency of drainage of the SL-type and H-type cables make them more in demand.
b
See lessExplanation: Lesser tendency of drainage of the SL-type and H-type cables make them
more in demand.
Corona reduces the transient surges due to _________
a Explanation: Due to the charge dissipation, corona is advantageous in reducing the voltages
a
See lessExplanation: Due to the charge dissipation, corona is advantageous in reducing the
voltages
Consider the two statements and choose the options. (i) Transmission of electrical power by dc is economical than with the ac (ii) In case of dc transmission, there is no charging current which contributes to continuous load.
a Explanation: Both the statements are correct. DC transmission is economical while its installation is difficult and expensive.
a
See lessExplanation: Both the statements are correct. DC transmission is economical while its
installation is difficult and expensive.