1
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
Unbalanced supply voltage given to a $$3-$$ phase, data-connected induction motor will cause
A
zero sequence currents
B
less heating of the rotor
C
negative sequence component current
D
all of these
2
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
An induction motor having full load torque of $$60$$ $$Nm$$ when delta-connected develops a starting torque of $$120$$ $$N$$-$$m.$$ For the same simply voltage, if the motor is changed to star-connection, the starting torque developed will be
A
$$40$$ $$Nm$$
B
$$60$$ $$Nm$$
C
$$90$$ $$Nm$$
D
$$120$$ $$Nm$$
3
GATE EE 1996
MCQ (Single Correct Answer)
+1
-0.3
In an induction motor, if the air gap is increased
A
speed will reduce
B
efficiency will improve
C
power factor will be lower
D
breakdown torque will reduce
4
GATE EE 1995
MCQ (Single Correct Answer)
+1
-0.3
An induction motor is fed from a balanced three phase supply at rated voltage and frequency through a bank of three single phase transformers connected in delta-delta. One unit of the bank develops fault and is removed. Then
A
single phasing will occur and the machine fails to start
B
single phasing will not occur but the motor terminal voltages will become unbalanced and the machine can be loaded to the extent of 57.7% of its rating.
C
the machine can be loaded to the extent of 57.7% of its rating with balanced supply at its terminals.
D
the machine can be loaded to the extent of $$66\frac23\%$$ with balanced supply at its terminals.
GATE EE Subjects
EXAM MAP