Dc Machines Commutation Process 1 Online Exam Quiz
Dc Machines Commutation Process 1 GK Quiz. Question and Answers related to Dc Machines Commutation Process 1. MCQ (Multiple Choice Questions with answers about Dc Machines Commutation Process 1
Formula for cancellation of reactance voltage on an average basis using interpoles ________
Options
A : 2[Bi(av)liva] Nc = Lc (dic/dt) = Lc (2lc/tc)
B : [Bi(av)liva] Nc = Lc (dic/dt) = Lc (2lc/tc)
C : 2[Bi(av)liva] Nc = Lc (dic/dt) = Lc (lc/tc)
D : Cannot be determined
For a given 4-pole machine, carrying armature current 56.82 A, with 846 conductors. The mean flux density in the air gap under the interpoles is 0.5 Wb/m2 on full load and radial gap length is 0.3 cm. Ampere-turns required for an interpole is ____________
Options
A : 3198
B : 2099
C : 4198
D : 6297
A 440 V, 4-pole, 25 kW, dc generator has a wave-connected armature winding with 846 conductors. The mean flux density in the air-gap under the interpoles is 0.5 Wb/m2 on full load and the radial gap length is 0.3 cm. Number of turns required on each interpole is _________
Options
A : 74
B : 84
C : 64
D : 54
Which voltage is neutralized in voltage commutation process?
Options
A : Armature
B : Reactance
C : Field
D : Cannot be determined
Interpoles are excited with ____________
Options
A : Armature current
B : Field current
C : Separate supply
D : Mains current
In resistance commutation method we add resistance between __________________
Options
A : Brushes and external circuit
B : Commutator and armature winding
C : At field winding
D : Commutator and brush
Why brushes shifting method is not employed in practical commutation?
Options
A : Expensive
B : Construction problems
C : Causes demagnetization
D : Used practically
Commutation is delayed due to __________
Options
A : Leakage reactance
B : Effect of armature reaction
C : Leakage reactance and armature reaction
D : Because of other factors
Polarity of interpoles is one pole ahead in the direction of armature rotation in _____________
Options
A : Motor
B : Generator
C : Always ahead
D : Always behind
What is the effect on time constant of transient current, as a result of resistance commutation?
Options
A : Remains same
B : Decreases
C : Increases
D : Increases then decreases
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