1. Voltage regulation of a practical transmission line should be:
- Low
- Higher
- Zero
- Infinity
Correct answer: 1. Low
2. As the spacing between conductor increases the inductance:
- Increases
- Decreases
- Remains constant
Correct answer: 1. Increases
3. The economic factor associated with HV transmission:
- Small generating stations can be designed
- Smaller cross-sectional area of conductors
- Sagging is reduced
- Any of above
Correct answer: 2. Smaller cross-sectional area of conductors
4. Method for improving string efficiency:
- Guard ring
- Insulator grading
- Increased length of cross arms
- All of above
- None of above
Correct answer: 4. All of above
5. The presence of moisture in surrounding causes critical voltage of corona formation to:
- Increase
- Decrease
- Become zero
- Stay constant
Correct answer: 2. Decreases
6. Insulator cleaning water jets pump water at a pressure of:
- 50 – 250 psi
- 500 – 850 psi
- 1050 – 2280 psi
- 5000 – 5250 psi
Correct answer: 2. 500 – 850 psi
7. Insulators flashover is more often expected to occur on:
- HVDC lines
- HVAC lines
- Both of these
Correct answer: 1. HVDC lines
Explanation: Steady dc field produces the electrostatic forces which create more pollution. Unlink ac, voltage zero is absent in dc systems due to which arcs develop into flashovers.
8. Ferranti effect occurs on transmission lines when they are:
- Lightly loaded
- Moderately loaded
- Heavily loaded
- Fully loaded
Correct answer: 1. Lightly loaded
9. The impact of high temperature on overhead lines:
- Increases stress
- Increases length
- Both of these
- None of these
Correct answer: 2. Increases length
10. The law used for economical sizing of conductors:
- Ohm’s law
- Kelvin law
- Superposition principle
- Snell’s law
Correct answer: 2. Kelvin law
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