ELECTRICIAN 2nd YEAR MODULE – Transmission and Distribution ONLINE TEST

Question 1 of 25

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

Keeping binding turns very close

Providing guard wires below the conductors

Making binding turns very tight

Providing more than one binding

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 current carrying capacity

To minimize the line sag

To increase the tensile strength

Question 2 of 25

Question 3 of 25

3. What is ACSR stands for?

Aluminium Core Steel Reinforced

All Conductors Steel Reinforced

Aluminium Covered Steel Reinforced

Aluminium Conductor Steel Reinforced

Question 3 of 25

Question 4 of 25

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

Avoid sparking

Avoid oxide formation

Avoid corrosion

Avoid atmospheric pressure

Question 4 of 25

Question 5 of 25

5. What is the name of line insulator?

Suspension type insulator

Disc type insulator

Pin type insulator

Shackle type insulator

Question 5 of 25

Question 6 of 25

6. What is the advantage of AC power transmission?

Voltages can be stepped up and stepped down easily

Stress on transmission lines is minimum

Corona loss negligible

Low voltage drop in transmission lines

Question 6 of 25

Question 7 of 25

7. What is the name of the insulator?

Stay insulator

Shackle insulator

Single shed pin 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?

More than one Mega ohm

More than two Mega ohms

Infinity

More than three Mega ohms

Question 8 of 25

Question 9 of 25

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

2400 W

3000 W

1200 W

800 W

Question 9 of 25

Question 10 of 25

10. 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

Not to attract birds to sit on it

To withstand high voltage

Question 10 of 25

Question 11 of 25

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

Supporting the line conductors

Reduces conductor sag between supports

Holding the insulators on overhead line

Avoids short circuit between conductors

Question 11 of 25

Question 12 of 25

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

Mobile substation

Secondary substation

Distribution substation

Mining substation

Question 12 of 25

Question 13 of 25

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

No interference with the communication lines

Faults can be located easily

Not liable to the hazards from lightning discharges

Public safety is more

Question 13 of 25

Question 14 of 25

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

Hard drawn copper

Aluminium

ACSR

Galvanised iron

Question 14 of 25

Question 15 of 25

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

No effect operates normally

Whole string become useless

Only the damaged disc will not function

Damaged insulator and the adjacent insulator will not function

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

Increases to maximum

Becomes negligible

Decreases half of the value

Question 16 of 25

Question 17 of 25

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

Pin insulator

Post insulator

Shackle insulator

Strain insulator

Question 17 of 25

Question 18 of 25

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

Three phase three wire

Two phase three wire

Single phase two wire

Two phase four wire

Question 18 of 25

Question 19 of 25

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

Twisted joint

Straight sleeve joint

Compression joint for ACSR

Straight joint through connectors

Question 19 of 25

Question 20 of 25

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

Service mains

Service lines

Distributors

Feeders

Question 20 of 25

Question 21 of 25

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

Stay insulator

Disc insulator

Post insulator

Pin insulator

Question 21 of 25

Question 22 of 25

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

Strain insulator

Shackle insulator

Pin insulator

Suspension insulator

Question 22 of 25

Question 23 of 25

23. 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 23 of 25

Question 24 of 25

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

No power loss

No corona loss

No skin effect

No heat loss

Question 24 of 25

Question 25 of 25

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

Holding the insulators where the conductors are fastened

Protect from short between conductors

Provide more support to the O.H pole

Reduce the sag of the lines between poles

Question 25 of 25