Dc Machines Questions Bank Online Exam Quiz
Dc Machines Questions Bank GK Quiz. Question and Answers related to Dc Machines Questions Bank. MCQ (Multiple Choice Questions with answers about Dc Machines Questions Bank
Regenerative method of braking is based on ___________
Options
A : Back emf is less than the applied voltage
B : Back emf is equal to the applied voltage
C : Back emf of rotor is more than the applied voltage
D : Cannot be determined
Regeneration is not easily possible for ____________
Options
A : DC shunt motor
B : Separately excited motor
C : Compounding motor with weak series compounding
D : DC series motor
Which of the following method is not used for regeneration?
Options
A : Increasing field current
B : Increasing armature speed
C : Increasing supply voltage
D : Reducing supply voltage
During regenerative braking of DC motors ____________
Options
A : Motor will run as a generator
B : Motor will reverse in direction
C : Motor will run at reduced speed
D : Motor will run as free rotating shaft
When is the dynamic braking is employed?
Options
A : Non-reversing drive
B : Reversing drive
C : Both Reversing and Non-reversing
D : Cannot tell
Which method of braking is generally used in elevators?
Options
A : Plugging
B : Regenerative braking
C : Rheostatic braking
D : Mechanical braking
If the terminals of armature of DC motor are interchanged, this action will offer following kind of electrical braking ______________
Options
A : Regenerative
B : Plugging
C : Dynamic braking
D : Depends on other parameters
Regenerative braking is used when duty cycle ____________
Options
A : Requires braking of machine
B : Requires accelerating of machine
C : Requires constancy of machine
D : Cannot comment on duty cycle
For which of the following motor dynamic braking is very effective?
Options
A : Shunt motors
B : Separately excited motors
C : Series motors
D : Differential compound motors
Where dynamic braking is used?
Options
A : Shunt motors
B : Series motors
C : Compound motors
D : All DC motors
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