TRANSMISSION AND DISTRIBUTION - Practice Mode

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

Provide more support to the O.H pole Protect from short between conductors Reduce the sag of the lines between poles Holding the insulators where the conductors are fastened

Correct Answer: Holding the insulators where the conductors are fastened

2) What is the advantage of overhead lines compared to underground cable?

Public safety is more Faults can be located easily No interference with the communication lines Not liable to the hazards from lightning discharges

Correct Answer: Faults can be located easily

3) Which substation the transmission line voltage is stepped down to consumer supply voltage?

Mobile substation Mining substation Secondary substation Distribution substation

Correct Answer: Distribution substation

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

Whole string become useless No effect operates normally Only the damaged disc will not function Damaged insulator and the adjacent insulator will not function

Correct Answer: Only the damaged disc will not function

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

Keeping binding turns very close Making binding turns very tight Providing guard wires below the conductors Providing more than one binding

Correct Answer: Making binding turns very tight

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