Question 1 of 25

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

Two phase four wire

Three phase three wire

Two phase three wire

Single phase two wire

Question 1 of 25

Question 2 of 25

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

To reduce the line voltage drop

To increase the tensile strength

To increase the current carrying capacity

To minimize the line sag

Question 2 of 25

Question 3 of 25

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

Suspension insulator

Strain insulator

Pin insulator

Shackle insulator

Question 3 of 25

Question 4 of 25

4. What is the name of line insulator?

Disc type insulator

Shackle type insulator

Pin type insulator

Suspension type insulator

Question 4 of 25

Question 5 of 25

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

Providing guard wires below the conductors

Making binding turns very tight

Providing more than one binding

Keeping binding turns very close

Question 5 of 25

Question 6 of 25

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

Galvanised iron

ACSR

Aluminium

Hard drawn copper

Question 6 of 25

Question 7 of 25

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

Reduce the sag of the lines between poles

Provide more support to the O.H pole

Holding the insulators where the conductors are fastened

Protect from short between conductors

Question 7 of 25

Question 8 of 25

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

Avoid oxide formation

Avoid atmospheric pressure

Avoid corrosion

Avoid sparking

Question 8 of 25

Question 9 of 25

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

Disc insulator

Pin insulator

Post insulator

Stay insulator

Question 9 of 25

Question 10 of 25

10. What is the advantage of AC power transmission?

Stress on transmission lines is minimum

Corona loss negligible

Voltages can be stepped up and stepped down easily

Low voltage drop in transmission lines

Question 10 of 25

Question 11 of 25

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

Mining substation

Secondary substation

Distribution substation

Mobile substation

Question 11 of 25

Question 12 of 25

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

Service mains

Distributors

Feeders

Service lines

Question 12 of 25

Question 13 of 25

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

415 V/240 V

11 KV/415 V

415 V/110 V

240 V/110 V

Question 13 of 25

Question 14 of 25

14. 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 14 of 25

Question 15 of 25

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

Public safety is more

No interference with the communication lines

Not liable to the hazards from lightning discharges

Faults can be located easily

Question 15 of 25

Question 16 of 25

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

Damaged insulator and the adjacent insulator will not function

Only the damaged disc will not function

No effect operates normally

Whole string become useless

Question 16 of 25

Question 17 of 25

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

Strain insulator

Post insulator

Shackle insulator

Pin insulator

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

2400 W

3000 W

1200 W

Question 18 of 25

Question 19 of 25

19. 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 19 of 25

Question 20 of 25

20. What is ACSR stands for?

Aluminium Conductor Steel Reinforced

Aluminium Covered Steel Reinforced

Aluminium Core Steel Reinforced

All Conductors Steel Reinforced

Question 20 of 25

Question 21 of 25

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

Straight sleeve joint

Straight joint through connectors

Compression joint for ACSR

Twisted joint

Question 21 of 25

Question 22 of 25

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

Becomes negligible

Increases to maximum

Decreases half of the value

No effect, remain same

Question 22 of 25

Question 23 of 25

23. What is the name of the insulator?

Shackle insulator

Suspension insulator

Single shed pin insulator

Stay insulator

Question 23 of 25

Question 24 of 25

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

To withstand high voltage

Not to attract birds to sit on it

To offer high mechanical strength

Disables continuous water flow in rainy season

Question 24 of 25

Question 25 of 25

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

No skin effect

No power loss

No corona loss

No heat loss

Question 25 of 25