1
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A rotating electrical machine having its self-inductances of both the stator and the rotor windings, independent of the rotor position will be definitely not develop
A
starting torque
B
synchronizing torque
C
hysteresis torque
D
reluctance torque
2
GATE EE 2004
MCQ (Single Correct Answer)
+2
-0.6
A 400 V, 15 kW, 4 pole, 50 Hz, Y-connected induction motor has full load slip of 4%. The output torque of the machine at full load is
A
1.66 Nm
B
95.50 Nm
C
99.47 Nm
D
624.73 Nm
3
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
Following are some of the properties of rotating electrical machines
P. Stator winding current is dc, rotor-winding current is ac
Q. Stator winding current is ac, rotor-winding current is dc
R. Stator winding current is ac, rotor-winding current is ac
S. Stator has salient poles and rotor has commutator
T. Rotor has salient poles and sliprings and stator is cylindrical
U. Both stator and rotor have poly-phase windings

DC machines. Synchronous machines and Induction machines exhibit some of the above properties as given in the following table. Indicate the correct combination from this table

A
DC
Machines
Synchronous
Machines
Induction
Machines
P.S Q.T R.U
B
DC
Machines
Synchronous
Machines
Induction
Machines
Q.U P.T R.S
C
DC
Machines
Synchronous
Machines
Induction
Machines
P.S R.U Q.T
D
DC
Machines
Synchronous
Machines
Induction
Machines
R.S Q.U P.T
4
GATE EE 2003
MCQ (Single Correct Answer)
+2
-0.6
A 3-phase Inductor Motor is driving a constant torque load at rated voltage and frequency. If both voltage and frequency are halved, following statements relate to the new condition if stator resistance, leakage reactance and core loss are ignored.
P. The difference between synchronous speed and actual speed remains same
Q. The air-gap flux remains same
R. The stator current remains same
S. The p.u. slip remains same
Among the above, correct statements are
A
All
B
P, Q and R
C
Q, R and S
D
P and S
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