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Week # 2 Quiz 5
A 3-phase transmission line is being supported by three disc insulators. The potentials across top unit (i.e., near to the tower) and middle unit are 8 kV and 12 kV respectively. Calculate the ratio of capacitance between pin and earth to the self-capacitance of each unit.
A string insulator has \(3\) units. The voltage across bottom most unit is \(11 kV\) and its efficiency is \(85 \%\). Find the total operating voltage.
A line operating at 50 Hz is 81% series compensated. The resonating frequency is
In a cable of conductor diameter 'd' and overall diameter with dielectric material 'D', the maximum dielectric stress.
occurs at the conductor surface and is proportional to d
occurs at the conductor surface and is proportional to 1/ d
occurs at the conductor surface and is proportional to 1/D
occurs at the conductor surface and is proportional to D
In a power system, active power is influenced with
Both (A) & (C)
PLCC is used in substation which do not include among following
power line conductor
Two part tariff charges are for
Units and P.f.
Units and power
Units + maximum demand, kVA
Find GMR of a stranded conductor having seven identical strands each of radius r as shown in Fig.
A cable has inductance of 0.22 mH per km and capacitance of 0.202 \(\mu\)F per km. The surge impedance of the cable is
Which one of the following statements is TRUE?
Numerical protective system require significantly more panel space than the space required by electromechanical/static systems that provide similar functions.
Numerical relays does not have the ability to perform self-monitoring and self-testing functions, which were available in electromechanical/static relays.
The cost per function of numerical relays is higher compared to the cost of their electromechanical and static counterparts.
Numerical relays place significantly less burden on instrument transformers than the burden placed by electromechanical/static relays
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