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The voltage required to produce a spark across the gap, between the sparking points is
Sparking at the commutator of a D.C. motor may result in
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Sparking occurs when a load is switched off because the circuit has high
In a universal motor, the most common cause of brush sparking is
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the 'corresponding states'. At equal reduced conditions i.e., at the corresponding state, the __________ of different gases are nearly the same.
Today youngsters ___ themselves in ___ to much mobile contacts with their peers?
complete the sentence with suitable versbs : Today's youngsters --------- themselves in ------------ too much mobile contacts with their peers.
The arcing contacts in a circuit breaker are made of