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Q.1
When are single phase series universal motors used?
When high starting torque is required
When starting on no-load is required
When constant speeds are required
When low speed drives are required
Q.2
When is the stator winding of a three phase squirrel-cage induction motor connected in star?
when in full load
when running at rated speed
when on light load
when starting the motor
Q.3
What is the percentage slip of a motor at full load speed where the nameplate details are: f= 50Hz, poles =full load speed =rpm?
s = 3%
s = 4%
s = 5%
s = 6%
Q.4
What is the shape of the laminations used in the magnetic circuit of a single phase shell-type transformer?
LL
TT
LE
EI
Q.5
What type of transformer is used for interconnecting high voltage transmission systems operating at different voltage levels?
Current transformer
wound transformer
Voltage transformer
Autotransformer
Q.6
What conditions must be satisfied before connecting two transformers in parallel to share a common load?
Same inductance, same kVA rating
Same polarity, same phase sequence
Same polarity resistance, same current ratio
Same number of polarity turns, same voltage regulation
Q.7
What two power losses occur in a transformer when operating on no-load?
Mechanical losses, core losses
Frictional losses, heat losses
Rotational losses, copper losses
Copper losses, core losses
Q.8
What is the danger of opening the secondary circuit of an energized current transformer?
High voltage appears across the secondary.
Large current flows in the primary.
High voltage appears across the primary.
Large current flows in the secondary.
Q.9
Which property of a transformer is measured by the change in output voltage from no-load to full-load conditions?
voltage ratio
transformer efficiency
voltage regulation
power transfer
Q.10
Why are power transformers operated in parallel?
To increase the current rating of the supply.
To maximize power supply flexibly.
To improve voltage regulation.
To reduce heat loss.
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