
AC Machines Technical Quiz
Authored by Ms. Sumitha
Science
University
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20 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The basic function of a transformer is to change
the level of the voltage
the power level
the power factor
the frequency
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
In a shaded pole motor, shading coils are using to
reduce winding losses
reduce friction losses
produce rotating magnetic field
protect against sparking
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The capacitor in a capacitor-start induction run ac motor is connected in series with
starting winding
running winding
squirrel cage winding
compensating winding
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
why is a centrifugal switch used in a 1-ph induction motor
To protect the motor from overloading
To improve the starting performance of the motor
To cut off the starting winding at an appropriate instant
d) To cut in the capacitor during running conditions
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Induction generators deliver power at
Leading power factor only
Lagging power factor only
Leading as well as lagging power factor
Unity power factor only
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The method that gives continuous speed control of a slip-ring induction motor is
Rotor resistance control
Secondary foreign voltage control
Concatenation or cascade operation
Line voltage control
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
During plugging of an induction motor
Phase sequence is reversed
A dc source is connected to stator
One phase is open-circuited
v
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