GETCO Exam Paper (11-06-2017)
The stability of arc in vacuum depends on

the contact material with its vapour presssure and the circuit parameters
the circuit parameters only
the contact material only
the contact material and its vapour pressure

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GETCO Exam Paper (11-06-2017)
In a 3-phase, 4-wire cable the cross sectional area of neutral conductor is

half of the area of phase conductor
double the area of phase conductor
equal to the area of phase conductor
1.5 times the area of phase conductor

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