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. Distributors are 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 loss increase with.....?

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. Distributors are 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 loss increase with.....?

#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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