1. If the supply frequency of a transmission line increases, the skin effect
(a) is increases
(b) is decreases
(c) remain same
(d) become very low
Answer
2. If the length of a transmission line increases, its capacitive reactance
(a) decreases
(b) increases
(c) remain same
(d) becomes very high
Answer
3. If the spacing between the conductors of overhead transmission line increases, its inductance is
(a) decreases
(b) increases
(c) remain same
(d) none of above
Answer
4. The potential across the various discs of suspension string is different due to
(a) self capacitance
(b) shunt capacitance
(c) skin effect
(d) corona losses
Answer
5. If shunt capacitance of a string of suspension insulators is increases, then its string efficiency is
(a) decreases
(b) increases
(c) remain same
(d) none of the above
Answer
6. When the string efficiency is increased, then the voltage across the discs nearest to the conductor
(a) increases
(b) decreases
(c) remain the same
(d) none of above
Answer
7. If the spacing between conductor is increased, the inductance of transmission line
(a) increases
(b) decreases
(c) remains same
(d) none of the above
Answer
8. If the spacing between conductors is increased, the capacitance of transmission line
(a) increases
(b) decreases
(c) remains same
(d) none of the above
Answer
9. In overhead lines, if the string efficiency is maximum which means
(a) self capacitance is zero.
(b) shunt capacitance is maximum.
(c) shunt capacitance is zero.
(d) self capacitance is maximum.
Answer
10. In order to improve power factor of a distribution system, the synchronous capacitors are installed at the
(a) receiving end
(b) sending end
(c) intermediate point
(d) substation
Answer
11. Static capacitors used in transmission line are rated in terms of
(a) kW
(b) kWh
(c) kVAR
(d) farad
Answer
12. Transposition of transmission line is done to
(a) decrease skin effect.
(b) decrease I2R losses.
(c) balance line voltage drop.
(d) decrease corona.
Answer
13. The constants of the transmission lines are
(a) resistance
(b) inductance
(c) capacitance
(d) all of the above
Answer
14. Feeder are designed mainly from the point of view of
(a) voltage drop in it.
(b) its current carrying capacity.
(c) operating frequency.
(d) operating voltage.
Answer
15. For 66 kV lines the number of insulator discs used are
(a) 2
(b) 5
(c) 8
(d) 10