MCQs on Transmission and Distribution

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 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    

2. If the length of a transmission line increases, its capacitive reactance
(a) decreases
(b) increases
(c) remain same
(d) becomes very high    

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   

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   

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     

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   

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      

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     

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.    

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    

11. Static capacitors used in transmission line are rated in terms of
(a) kW
(b) kWh
(c) kVAR
(d) farad     

12. Transposition of transmission line is done to
(a) decrease skin effect.
(b) decrease I2R losses.
(c) balance line voltage drop.
(d) decrease corona.    

13. The constants of the transmission lines are
(a) resistance
(b) inductance
(c) capacitance
(d) all of the above    

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.    

15. For 66 kV lines the number of insulator discs used are
(a) 2
(b) 5
(c) 8
(d) 10    

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