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Browse complete papersA load rated at 100 kVA operates at a power factor of 0.6. After power factor correction, it becomes 0.9. Find the reduction in kVA demand.
20 kVA
30 kVA
33.3 kVA
40 kVA
Correct answer
20 kVA
The economic power factor of an industrial electrical system is defined as which value?
Unity
Zero
Leading
Slightly less than unity
Correct answer
Unity
A transmission line has a resistance of 20 \( \Omega \) per phase. If the line current is reduced by 20% due to power factor correction, determine the percentage reduction in copper losses.
20%
32%
36%
64%
Correct answer
20%
Under which condition is corona loss in a transmission line minimum?
Voltage is high
Conductor surface is rough
Weather is dry
Air density is low
Correct answer
Voltage is high
A transmission system becomes most economical under which operating condition?
Voltage is low
Current is high
Voltage is high
Resistance is high
Correct answer
Voltage is low
Which type of transmission line is employed for voltage levels exceeding 33 kV?
Underground cable
Overhead transmission line
Coaxial cable
Twisted pair
Correct answer
Underground cable
Kirchhoff's Voltage Law (KVL) results from the conservation law of:
Charge
Energy
Momentum
Mass
Correct answer
Charge
Two \( 6 \Omega \) and \( 3 \Omega \) resistors are linked in parallel. What is the current passing through the \( 6 \Omega \) resistor if the combination receives a total current of 9 A?
6 A
3 A
4 A
2 A
Correct answer
6 A
Which of the following units represents the magnetic flux?
Tesla
Weber
Henry
Ampere-turn
Correct answer
Tesla
Which of the following conditions must be satisfied for the Superposition Theorem to be applicable in an electrical network?
The network must contain non-linear elements
The network must be linear and bilateral
The network must contain only passive elements
The network must operate at a constant temperature
Correct answer
The network must contain non-linear elements