Electrical Power Transmission MCQs Part 14
Contents
Suspension type insulators are employed for voltages beyond
Suspension type insulators are employed for voltages beyond:
- 230 V
- 11 kV
- 13 kV
- 33 kV
Correct answer: 4. 33 kV
If span is increased, the sag
If span is increased, the sag:
- Increases
- Decreases
- Is not being affected
- None of above
Correct answer: 1. Increases
If string efficiency is increased, voltage across disc nearest to conductor
If string efficiency is increased, voltage across disc nearest to conductor:
- Increases
- Decreases
- Remains unchanged
- None of these
Correct answer: 2. Decreases
A string efficiency of 100% implies that
A string efficiency of 100% implies that:
- Shunt capacitance is maximum
- Shunt capacitance is zero
- Self-capacitance is maximum
- Self-capacitance is zero
Correct answer: 2. Shunt capacitance is zero Explanation: If shunt capacitance is zero, this indicates that charging current through each disc will be the same. This means that voltage across each disc is the same. This inturn implies 100% string efficiency.
With an increase in length of transmission lines, the resistance of line
With an increase in length of transmission lines, the resistance of line:
- Increases
- Decreases
- Remains unchanged
- None of these
Correct answer: 1. Increases
Explanation: Resistance of line is mathematically expressed in the form:
R= ρl/a
Since length of transmission and resistance are directly proportional, the resistance R increases.
See Complete list of Electrical Power transmission MCQs here