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Browse complete papers\( SF_{6} \) circuit breakers are preferred mainly due to which advantage?
Low cost
High arc-quenching ability
Simple construction
High maintenance
Correct answer
Low cost
A coaxial cable exhibits high transmission efficiency under which condition?
Dielectric loss is maximum
Conductor resistance is high
Attenuation is minimum
Operating frequency is zero
Correct answer
Dielectric loss is maximum
Which wiring system is considered most suitable for use in damp or wet locations?
Cleat wiring
Batten wiring
Casing and capping
Conduit wiring
Correct answer
Cleat wiring
Earth resistance decreases under which condition?
Soil resistivity increases
Moisture content increases
Electrode length decreases
Contact area reduces
Correct answer
Soil resistivity increases
Which wiring system involves the highest initial cost but requires the least maintenance?
Cleat wiring
Batten wiring
Casing and capping
Conduit wiring
Correct answer
Cleat wiring
The demand factor of an electrical installation is always which of the following?
Equal to unity
Less than unity
Greater than unity
Zero
Correct answer
Equal to unity
Which equipment is most commonly used in industries for improving power factor?
Inductor
Capacitor bank
Reactor
Fuse
Correct answer
Inductor
A load consumes 50 kW at a lagging power factor of 0.8. Determine the apparent power drawn by the load.
40 kVA
50 kVA
62.5 kVA
80 kVA
Correct answer
40 kVA
For a constant kW load, a consumer improves the power factor from 0.8 to 0.95. What happens to the line current?
Increase
Decrease
Remain constant
First increases then decreases
Correct answer
Increase
A transmission line supplies 50 MW of power at a power factor of 0.8. Calculate the reactive power supplied.
30 MVAR
37.5 MVAR
50 MVAR
62.5 MVAR
Correct answer
30 MVAR