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I) Unsymmetrical spacing configurations cause the line interference. (II) Unsymmetrical spacing causes the voltage induction in the communication lines. The above problems can be eliminated by ________
a Explanation: Transposition meaning exchange of conductors will cause the net voltage induced in the other lines to be zero as the net inductance remains constant.
a
See lessExplanation: Transposition meaning exchange of conductors will cause the net voltage
induced in the other lines to be zero as the net inductance remains constant.
(I) Unsymmetrical spacing configurations cause the line interference. (II) Unsymmetrical spacing causes the voltage induction in the communication lines.
a Explanation: Both the statements are correct as the unsymmetrical spacing causes the unbalanced voltage generation.
a
See lessExplanation: Both the statements are correct as the unsymmetrical spacing causes the
unbalanced voltage generation.
A 10 MVA, 11 kV alternators has positive, negative and zero sequence reactance of 25%, 40%, 10% respectively. The resistance that must be placed in the neutral such that zero sequence of fault current for a single phase to ground fault will not exceed the rated line current in pu is _____
Answer: a
Answer: a
See lessA 10 MVA, 11 kV alternator has positive, negative and zero sequence reactance of 25%, 40%,10% respectively. The resistance that must be placed in the neutral such that zero sequence of fault current for a single phase to ground fault will not exceed the rated line current in ohms is
a Explanation:
a
See lessExplanation:
______ conductors are the latest trend of the extra high voltage lines.
a Explanation: The bundled ACSR conductors have corona free characteristics and they have good tensile strength.
a
See lessExplanation: The bundled ACSR conductors have corona free characteristics and they
have good tensile strength.
The number of the strands included in the stranded cables while implementing a similar cable equivalent of single strand should be ________
a Explanation: It is 3x2 -3x+1.
a
See lessExplanation: It is 3×2
-3x+1.
The inductance of the conductor contributed by the flux between the point D outside at the distance d from conductor is ____________
a Explanation: L= 0.461 log(d/r) mH/km.
a
See lessExplanation: L= 0.461 log(d/r) mH/km.
f the flux linkages are varied sinusoid with current, then what can be concluded about the inductance?
b Explanation: Inductance = flux linkages/current.
b
See lessExplanation: Inductance = flux linkages/current.
At a 33kV 50 Hz to a bus a load of 35 MW is connected. To improve the power factor to unity a synchronous phase modifier is connected taking 5 MW. If the SPM is represented as delta connected impedance, where in each phase we have capacitor connected parallel to resistance forming RC parallel network, then the value of this capacitance is __________
a Explanation: Q=3V2Cω C= 25.57 μF
a
See lessExplanation: Q=3V2Cω
C= 25.57 μF
At a 33kV 50 Hz to a bus a load of 35 MW is connected. To improve the power factor to unity a synchronous phase modifier is connected taking 5 MW. If the SPM is represented as delta connected impedance, where in each phase we have capacitor connected parallel to resistance forming RC parallel network, then the value of this resistance is ___________
a Explanation: Reactive power fed by SPM = 35tan36.87 = 26.25 MVAR Active power consumed by prime mover = 5 MW 5*106 = 3V2 /R R=3(33×1000)2 /(5*106 ) = 653.4 Ω.
a
See lessExplanation: Reactive power fed by SPM = 35tan36.87 = 26.25 MVAR
Active power consumed by prime mover = 5 MW
5*106 = 3V2
/R
R=3(33×1000)2
/(5*106
) = 653.4 Ω.