Question 1 of 25

1. What is the type of over head line joint?

Straight sleeve joint

Straight joint through connectors

Twisted joint

Compression joint for ACSR

Question 1 of 25

Question 2 of 25

2. What is the name of conductor used on overhead lines?

Hard drawn copper

Galvanised iron

ACSR

Aluminium

Question 2 of 25

Question 3 of 25

3. Why the disc pin insulators outer surface is made by glazing and bent the sides inward?

Not to attract birds to sit on it

To offer high mechanical strength

Disables continuous water flow in rainy season

To withstand high voltage

Question 3 of 25

Question 4 of 25

4. What is the name of the insulator?

Suspension insulator

Stay insulator

Shackle insulator

Single shed pin insulator

Question 4 of 25

Question 5 of 25

5. Why steel is reinforced in ACSR conductors used for over head lines?

To increase the tensile strength

To minimize the line sag

To reduce the line voltage drop

To increase the current carrying capacity

Question 5 of 25

Question 6 of 25

6. Which electric lines connect the substation to distributors in distribution system?

Distributors

Service lines

Feeders

Service mains

Question 6 of 25

Question 7 of 25

7. Which type of line insulator is used for terminating on corner post?

Strain insulator

Pin insulator

Shackle insulator

Suspension insulator

Question 7 of 25

Question 8 of 25

8. What is the insulation resistance between any two conductors in a medium voltage domestic installation as per IE rules?

Infinity

More than three Mega ohms

More than one Mega ohm

More than two Mega ohms

Question 8 of 25

Question 9 of 25

9. What is the reason for the conductor cross-sectional area can fully utilised on transmission of DC as compared to AC?

No heat loss

No power loss

No corona loss

No skin effect

Question 9 of 25

Question 10 of 25

10. What is the main purpose of crossarm used in electric poles?

Holding the insulators on overhead line

Reduces conductor sag between supports

Supporting the line conductors

Avoids short circuit between conductors

Question 10 of 25

Question 11 of 25

11. What is the reason of keeping binding wire gap too close and very tight in pin insulator?

Avoid sparking

Avoid corrosion

Avoid oxide formation

Avoid atmospheric pressure

Question 11 of 25

Question 12 of 25

12. Which type of A.C transmission is universally adopted?

Two phase three wire

Two phase four wire

Single phase two wire

Three phase three wire

Question 12 of 25

Question 13 of 25

13. What is the name of line insulator?

Shackle type insulator

Disc type insulator

Pin type insulator

Suspension type insulator

Question 13 of 25

Question 14 of 25

14. Which substation the transmission line voltage is stepped down to consumer supply voltage?

Mining substation

Secondary substation

Distribution substation

Mobile substation

Question 14 of 25

Question 15 of 25

15. What is the name of the insulator used in O.H lines?

Shackle insulator

Strain insulator

Pin insulator

Post insulator

Question 15 of 25

Question 16 of 25

16. What will happen to the skin effect on the O.H conductors, if the conductor diameter is small (<1cm)?

No effect, remain same

Decreases half of the value

Becomes negligible

Increases to maximum

Question 16 of 25

Question 17 of 25

17. What is the purpose of cross-arm in O.H lines?

Holding the insulators where the conductors are fastened

Provide more support to the O.H pole

Protect from short between conductors

Reduce the sag of the lines between poles

Question 17 of 25

Question 18 of 25

18. Which type of line insulator is used at the dead ends of the H.T overhead lines?

Pin insulator

Disc insulator

Post insulator

Stay insulator

Question 18 of 25

Question 19 of 25

19. What is the advantage of over head lines compared to underground cable?

Public safety is more

No interference with the communication lines

Faults can be located easily

Not liable to the hazards from lightning discharges

Question 19 of 25

Question 20 of 25

20. What is the advantage of AC power transmission?

Low voltage drop in transmission lines

Voltages can be stepped up and stepped down easily

Stress on transmission lines is minimum

Corona loss negligible

Question 20 of 25

Question 21 of 25

21. What will happen to the string arrangement of disc insulators, if one of the disc insulator gets damaged?

No effect operates normally

Damaged insulator and the adjacent insulator will not function

Whole string become useless

Only the damaged disc will not function

Question 21 of 25

Question 22 of 25

22. What is the voltage ratio in A.C distribution line adopted for domestic consumers?

240 V/110 V

11 KV/415 V

415 V/110 V

415 V/240 V

Question 22 of 25

Question 23 of 25

23. What is ACSR stands for?

Aluminium Conductor Steel Reinforced

Aluminium Core Steel Reinforced

Aluminium Covered Steel Reinforced

All Conductors Steel Reinforced

Question 23 of 25

Question 24 of 25

24. How the sparking on the aluminium cored conductors binding joints can be prevented?

Providing more than one binding

Providing guard wires below the conductors

Keeping binding turns very close

Making binding turns very tight

Question 24 of 25

Question 25 of 25

25. Which is the permissible load for lighting subcircuit in domestic wiring as per IE rules?

2400 W

1200 W

3000 W

800 W

Question 25 of 25