Related Questions

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
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
Sparking occurs when a load is switched off because the circuit has high
A Resistance
B Inductance
C Capacitance
D Impedance
The sparking between two electrical contacts can be reduced by inserting a
A capacitor in parallel with contacts
B capacitor in series with each contact
C resistance in line
D none of the above
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
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
In a A.C. series motor armature coils are usually connected to commutator
A through resistance
B through reactances
C through capacitors
D solidly
Of the 120 households in an area, 55 have cars, 35 have motor bikes, and 20 have both cars and motor bikes. How many of the households in the area have neither cares nor motor bikes?
A 110
B 90
C 50
D 30
A motor pool has 300 vehicles of which 30% are trucks. 20% of all the vehicles in the motor pool are diesel, including 15 trucks. What percent of the motor pool is composed of vehicles that are neither trucks nor diesel?
A 165%
B 90%
C 65%
D 10%
By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?
A Frame
B Shaft
C Commutator
D Stator

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