Distribution

#1. A 3 phase 4 wire system is commonly used for….?

primary transmission

primary distribution

secondary transmission

secondary distribution

incorrect

#2. Feeder is designed mainly from the point of view of?

voltage drop in it

its current carrying capacity

operating voltage

frequency

#3. Feeder is designed mainly from the point of view of?

voltage drop in it

its current carrying capacity

operating voltage

frequency

#4. Most reliable distribution system is…..?

radial

ring main

inter connected

#5. The statuatory limit for voltage variations at the consumers terminals is +_……% of rated value?

5

6

8

10

#6. The major part of the investment on secondary distribution is…..?

conductors

pole fittings

distribution transformers

insulators

#7. In a transmission system the weight of copper used is proportional to …?

square of voltage

voltage

current

1/square of voltage

#8. The volume of copper required for an ac transmission line is inversely proportional to….?

voltage

current

power factor

both voltage and power factor

#9. ACSR conductors have…..?

inner conductors are made of aluminium

outer condictors are made of aluminium

all conductors made of aluminium

steel

#10. The function of steel wire in an ACSR conductor is to…..?

eliminate skin effect

increse corona

provide additional mechanical strength

increase voltage

#11. Strain type insulators are used …..?

at curved side

at dead ends

at intermediate anchor yowers

all the above

#12. Wavy structure of pin insulator decrease its….?

puncture strength

flash over voltage

mechanical strength

thermal strength

#13. In a 3 wire dc system, the load on +ve side is 400A and on -ve side it is 300A. then current in neutral wire is…..?

500 A

400A

100 A

800 A

#14. Voltage drop in feeders can be compensate by connecting….?

shunt capacitance

series capacitance

booster

reactance

#15. In a balanced 3 wire dc system, if voltage across the outers is 500V. then voltage between any outer and neutral is….?

250V

400V

500V

1000V

#16. A booster is connected ……with the feeder?

parallel

series

#17. The material used for the manufacture of ground wire is…..?

cast iron

copper

galvanised steel

stainless steel

#18. Effect of temperature rise in over head line is to…..?

decrease the sag

increase the sag

increase the sag and decrease the tension

decrease the sag and increase the tension

#19. The sag of a transmission line conductor in summer is….?

same as in winter

less than that in winter

greater than that in winter

#20. Corona is …..?

partial break down of air

complete break down of air

lines sparking

due to skin effect

#21. Corona is …..?

increase in conductor size

decrease in conductor size

increase in supply frequency

decrease in conductor size and increase in supply frquency

#22. Bundled conductors reduce….?

increases the line reactance

surface electric stress of conductor

decrease line reactance

none of the above

#23. The chance of occurance of corona are maximum during…..?

winter

dry weather

humid weather

summer

#24. The only advantages of corona formation in transmission line?

ozon depletion

increasing current

produces violet glow

works as a saftey valve for surges

#25. Skin effect of conductor proportional to…..?

diameter of conductor

square of the diameter of the conductor

half of the diameter of the conductor

#26. Bundled conductors in transmission line provide for…..?

reduce corona

reduce line inductance

increase capacitance

all the above

#27. High voltage transmission lines are transposed because of….?

minimized corona

minimised voltage drop

minimised phase voltage imbalance

reduce skin effect

#28. The distribution systems in india mostly in….?

network

ring

radial

parallel

#29. Use of bundled conductors reduce…..?

corona loss

surge impedence

radio interference and line inductance

all the above

#30. The surge impedence of a 50 miles long under ground cable is 50 ohm. for a 100 miles it will be….?

100 ohm

200 ohm

50 ohm

25 ohm

#31. Current transformer uses…?

step up transformer

step down transformer

centre tap transformer

potential transformer

#32. The transformer connection used at the substation end of the transmission line is…..?

star star

deltadelta

star delta

delta star

#33. Distribution transformer has maximum efficiency at….?

at no load

at full load

50% of load

none of these

#34. Distribution transformer has maximum efficiency at….?

near full load

near no load

50% load

none of these

#35. The conductor used for over head transmission line is….?

copper

steel

silver

ACSR

#36. The top most conductor in high voltage transmission line is….?

R phase

Y phase

B phase

earth wire

#1. A 3 phase 4 wire system is commonly used for….?

#2. Feeder is designed mainly from the point of view of?

#3. Feeder is designed mainly from the point of view of?

#4. Most reliable distribution system is…..?

#5. The statuatory limit for voltage variations at the consumers terminals is +_……% of rated value?

#6. The major part of the investment on secondary distribution is…..?

#7. In a transmission system the weight of copper used is proportional to …?

#8. The volume of copper required for an ac transmission line is inversely proportional to….?

#9. ACSR conductors have…..?

#10. The function of steel wire in an ACSR conductor is to…..?

#11. Strain type insulators are used …..?

#12. Wavy structure of pin insulator decrease its….?

#13. In a 3 wire dc system, the load on +ve side is 400A and on -ve side it is 300A. then current in neutral wire is…..?

#14. Voltage drop in feeders can be compensate by connecting….?

#15. In a balanced 3 wire dc system, if voltage across the outers is 500V. then voltage between any outer and neutral is….?

#16. A booster is connected ……with the feeder?

#17. The material used for the manufacture of ground wire is…..?

#18. Effect of temperature rise in over head line is to…..?

#19. The sag of a transmission line conductor in summer is….?

#20. Corona is …..?

#21. Corona is …..?

#22. Bundled conductors reduce….?

#23. The chance of occurance of corona are maximum during…..?

#24. The only advantages of corona formation in transmission line?

#25. Skin effect of conductor proportional to…..?

#26. Bundled conductors in transmission line provide for…..?

#27. High voltage transmission lines are transposed because of….?

#28. The distribution systems in india mostly in….?

#29. Use of bundled conductors reduce…..?

#30. The surge impedence of a 50 miles long under ground cable is 50 ohm. for a 100 miles it will be….?

#31. Current transformer uses…?

#32. The transformer connection used at the substation end of the transmission line is…..?

#33. Distribution transformer has maximum efficiency at….?

#34. Distribution transformer has maximum efficiency at….?

#35. The conductor used for over head transmission line is….?

#36. The top most conductor in high voltage transmission line is….?

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