Electrician 4th sem Transmission & Distribution

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

• Feeders

• Distributors

• Service lines

• Service mains

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

• Infinity

• More than one Mega ohm

• More than two Mega ohms

• More than three Mega ohms

What is diversity factor (D.F)?

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

• 415 V/240 V

• 240 V/110 V

• 415 V/110 V

• 11 KV/415 V

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

• Pin insulator

• Post insulator

• Strain insulator

• Shackle insulato

What is the name of line insulator?

• Pin type insulator

• Disc type insulator

• Shackle type insulator

• Suspension type insulator

Which is the permissible load for lighting sub circuit in domestic wiring as per IE rules?

• 800 W

• 1200 W

• 2400 W

• 3000 W

What is the name of the insulator?

• Stay insulator

• Shackle insulator

• Suspension insulator

• Single shed pin insulator

What is the reason for the conductor crosssectional area can fully utilised on transmission of DC as compared to AC?

• No heat loss

• No skin effect

• No power loss

• No corona loss

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