1. High voltages for transmitting power is economically available from ?

d.c. currents

a.c. currents

carrier currents

none of the above

Answer: a.c. currents

Explanation:


2. A synchronous condenser is generally installed at the of the transmission line ?

receiving end

sending end

middle

none of the above

Answer: receiving end

Explanation:


3. Power system stability is least affected by ?

reactance of generator

input torque

losses

reactance of transmission line

Answer: losses

Explanation:


4. By using bundle conductors, the critical voltage for the formation of corona will ?

remain same

decrease

increase

not occur

Answer: increase

Explanation:


5. System grounding is done so that ?

inductive interference between power and communication circuits can be controlled

the floating potential on the lower voltage winding for a transformer is brought down to an insignificant value

the arcing faults to earth would not set up dangerously high voltage on healthy phases

for all above reasons

Answer: for all above reasons

Explanation:


6. The area of cross-section of the neutral in a 3-wire D.C. system is generally the area of cross-section of main conductor ?

same as

one-fourth

one half

double

Answer: one half

Explanation:


7. For which of the following, the excitation control method is satisfactory ?

Low voltage lines

High voltage lines

Short lines

Long lines

Answer: Short lines

Explanation:


8. Which of the following is neglected in the analysis of short transmission lines ?

Series impedance

Shunt admittance

J2R loss

None of the above

Answer: Shunt admittance

Explanation:


9. Low voltage cables are meant for use up to ?

1.1 kV

3.3kV

6.6 kV

11 kV

Answer: 6.6 kV

Explanation:


10. There is a greater possibility of occurence of corona during ?

dry weather

winter

summer heat

humid weather

Answer: humid weather

Explanation: