1
GATE EE 2002
MCQ (Single Correct Answer)
+1
-0.3
If a 400 V, 50 Hz, star connected, 3 phase squirrel cage induction motor is operated from a 400 V, 75 Hz supply, the torque that the motor can now provide while drawing rated current from the supply?
A
reduces
B
increases
C
remains the same
D
increase or reduces depending upon the rotor resistance
2
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
Starting torque can be obtained in the case of a single phase induction motor with identical main and auxiliary windings by connecting
A
a capacitor across the mains
B
a capacitor in series with the machine
C
a capacitor in series with the auxiliary winding
D
the main and the auxiliary windings in series
3
GATE EE 1999
MCQ (Single Correct Answer)
+1
-0.3
The following starting method for an induction motor is inferior view of the poor starting torque per ampere of the line current drawn:
A
Direct line starting
B
Auto transformer method of starting
C
Series inductor method of starting
D
Star-Delta method of starting
4
GATE EE 1998
MCQ (Single Correct Answer)
+1
-0.3
A 3-phase squirrel cage induction motor has a full load efficiency of 0.8 and a maximum efficiency of 0.9. It is operated at a slip of 0.6 by applying a reduced voltage. The efficiency of the motor at this operating point is:
A
less than 0.4
B
greater than 0.6
C
in the range of 0.8 $$\pm$$ 0.1
D
None of the above
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