Related Questions

The voltage required to produce a spark across the gap, between the sparking points is
A 2,000 to 4,000 volts
B 4,000 to 6,000 volts
C 6,000 to 10,000 volts
D 10,000 to 12,000 volts
Sparking at the commutator of a D.C. motor may result in
A Damage to commutator segments
B Damage to commutator insulation
C Increased power consumption
D All of the above
Sparking, is discouraged in a D.C. motor because
A It increases the input power consumption
B Commutator gets damaged
C Both (A) and (B)
D None of the above
Sparking occurs when a load is switched off because the circuit has high
A Resistance
B Inductance
C Capacitance
D Impedance
In a universal motor, the most common cause of brush sparking is
A open armature winding
B shorted armature winding
C shorted field winding?
D high commutator mica
E all of the above
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
A Interpoles
B Dummy coils
C Compensating winding
D Shifting of axis of brushes
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.
A Compressibility
B Molecular weight
C Humidity
D None of these
Today youngsters ___ themselves in ___ to much mobile contacts with their peers?
A engaged making
B engage making
C keeping doing
D busy doing
complete the sentence with suitable versbs : Today's youngsters --------- themselves in ------------ too much mobile contacts with their peers.
A engage, making
B engaged, making
C keeping, doing
The arcing contacts in a circuit breaker are made of
A copper tungsten alloy
B porcelain
C electrolytic copper
D aluminium alloy

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