Dc Machines Braking Dc Motors 1 Online Exam Quiz
Dc Machines Braking Dc Motors 1 GK Quiz. Question and Answers related to Dc Machines Braking Dc Motors 1. MCQ (Multiple Choice Questions with answers about Dc Machines Braking Dc Motors 1
In dynamic braking, when braking is applied system acts as ___________
Options
A : Freely running machine
B : Motor with slow speed
C : Generator
D : Motor with same speed in opposite direction
Which of the following is the best braking method?
Options
A : Friction
B : Electromechanical action
C : Eddy-currents
D : Electric braking
Plugging is applied in a motor, if we don’t make the switch OFF what will happen?
Options
A : Motor will come to rest as a result of plugging
B : Motor will come to rest and will start rotating in another direction
C : Motor will burn
D : Nothing will happen
Which of the following is correct formula for braking torque in plugging?
Options
A : n (ka2/Rb)
B : n2 (ka2/Rb)
C : n-1 (ka2/Rb)
D : (ka2/Rb)
In which of the following electrical braking method, energy is supplied back to the supply?
Options
A : Plugging
B : Dynamic braking
C : Regenerative braking
D : In all electrical braking
Which of the following is not the method of electrical braking?
Options
A : Plugging or counter-current
B : Dynamic or rheostatic
C : Regenerative
D : Eddy current
Which of the following is the plugging method of braking?
Options
A : Reversal of field connections
B : Reversal of armature connections
C : Addition of equal and opposite field
D : Removal of field circuit from current machine circuit
Which of the following is dynamic braking?
Options
A : Reversal of field connections
B : Reversal of armature connections
C : Addition of equal and opposite field
D : Removal of armature circuit from current machine circuit
Plugging is used in ____________
Options
A : Small motors only
B : Small and medium powered
C : Only in large heavy machines
D : Everywhere
Electrical braking of any variety becomes less effective as ________________
Options
A : Speed increases
B : Speed decreases
C : Independent of speed
D : Depends on supply voltage
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