Q.1.
When are single phase series universal motors used?
Q.2.
When is the stator winding of a three phase squirrel-cage induction motor connected in star?
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?
Q.4.
What is the shape of the laminations used in the magnetic circuit of a single phase shell-type transformer?
Q.5.
What type of transformer is used for interconnecting high voltage transmission systems operating at different voltage levels?
Q.6.
What conditions must be satisfied before connecting two transformers in parallel to share a common load?
Q.7.
What two power losses occur in a transformer when operating on no-load?
Q.8.
What is the danger of opening the secondary circuit of an energized current transformer?
Q.9.
Which property of a transformer is measured by the change in output voltage from no-load to full-load conditions?
Q.10.
Why are power transformers operated in parallel?