Question 1 of 25

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

More than three Mega ohms

More than one Mega ohm

Infinity

More than two Mega ohms

Question 1 of 25

Question 2 of 25

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

Becomes negligible

Decreases half of the value

Increases to maximum

No effect, remain same

Question 2 of 25

Question 3 of 25

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

Making binding turns very tight

Keeping binding turns very close

Providing guard wires below the conductors

Providing more than one binding

Question 3 of 25

Question 4 of 25

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

Whole string become useless

Only the damaged disc will not function

No effect operates normally

Damaged insulator and the adjacent insulator will not function

Question 4 of 25

Question 5 of 25

5. What is the name of line insulator?

Shackle type insulator

Disc type insulator

Suspension type insulator

Pin type insulator

Question 5 of 25

Question 6 of 25

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

Two phase four wire

Two phase three wire

Single phase two wire

Three phase three wire

Question 6 of 25

Question 7 of 25

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

Strain insulator

Shackle insulator

Suspension insulator

Pin insulator

Question 7 of 25

Question 8 of 25

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

415 V/110 V

11 KV/415 V

240 V/110 V

415 V/240 V

Question 8 of 25

Question 9 of 25

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

Holding the insulators where the conductors are fastened

Reduce the sag of the lines between poles

Protect from short between conductors

Provide more support to the O.H pole

Question 9 of 25

Question 10 of 25

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

Compression joint for ACSR

Straight sleeve joint

Twisted joint

Straight joint through connectors

Question 10 of 25

Question 11 of 25

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

Faults can be located easily

Not liable to the hazards from lightning discharges

No interference with the communication lines

Public safety is more

Question 11 of 25

Question 12 of 25

12. 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 corona loss

No skin effect

No power loss

Question 12 of 25

Question 13 of 25

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

Strain insulator

Pin insulator

Post insulator

Shackle insulator

Question 13 of 25

Question 14 of 25

14. What is the name of the insulator?

Suspension insulator

Single shed pin insulator

Shackle insulator

Stay insulator

Question 14 of 25

Question 15 of 25

15. What is ACSR stands for?

Aluminium Covered Steel Reinforced

Aluminium Core Steel Reinforced

All Conductors Steel Reinforced

Aluminium Conductor Steel Reinforced

Question 15 of 25

Question 16 of 25

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

Disc insulator

Post insulator

Pin insulator

Stay insulator

Question 16 of 25

Question 17 of 25

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

Avoid sparking

Avoid corrosion

Avoid atmospheric pressure

Avoid oxide formation

Question 17 of 25

Question 18 of 25

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

800 W

3000 W

1200 W

2400 W

Question 18 of 25

Question 19 of 25

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

To increase the current carrying capacity

To increase the tensile strength

To reduce the line voltage drop

To minimize the line sag

Question 19 of 25

Question 20 of 25

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

To offer high mechanical strength

Disables continuous water flow in rainy season

To withstand high voltage

Not to attract birds to sit on it

Question 20 of 25

Question 21 of 25

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

Supporting the line conductors

Holding the insulators on overhead line

Avoids short circuit between conductors

Reduces conductor sag between supports

Question 21 of 25

Question 22 of 25

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

Mobile substation

Distribution substation

Secondary substation

Mining substation

Question 22 of 25

Question 23 of 25

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

Galvanised iron

Aluminium

Hard drawn copper

ACSR

Question 23 of 25

Question 24 of 25

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

Service mains

Distributors

Service lines

Feeders

Question 24 of 25

Question 25 of 25

25. 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 25 of 25