
DC and AC Machine Fundamentals Quiz
Quiz
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Other
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University
•
Hard
PROFESOR SEROJI
Used 7+ times
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6 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary function of a commutator in a DC machine?
To increase the efficiency of the machine
To convert AC voltage into DC voltage
To ensure unidirectional current flow in the armature
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a separately excited DC motor, how is the field winding powered?
By a separate DC source independent of the armature supply
By the same power supply as the armature
By an external AC source
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What happens to the speed of a DC shunt motor if the field resistance is increased?
The speed increases
The speed decreases
The speed remains constant
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What determines the synchronous speed of an AC machine?
The supply frequency and the number of poles
The armature resistance and supply voltage
The rotor current and stator inductance
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In an induction motor, what is slip?
The speed difference between the stator field and the rotor
The difference in voltage between the stator and rotor
The loss in efficiency due to copper losses
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is the rotor of a synchronous motor unable to start on its own?
It requires an external DC supply to excite the rotor field
It lacks the slip needed for starting torque like an induction motor
It has a very high starting current requirement
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