1
GATE EE 2014 Set 2
MCQ (Single Correct Answer)
+2
-0.6
A three-phase slip-ring induction motor, provided with a commutator winding, is shown in the figure. The motor rotates in clockwise direction when the rotor windings are closed. GATE EE 2014 Set 2 Electrical Machines - Induction Machines Question 31 English If the rotor winding is open circuited and the system is made to run at rotational speed fr with the help of prime-mover in anti-clockwise direction, then the frequency of voltage across slip rings is f1 and frequency of voltage across commutator brushes is f2. The values of f1 and f2 respectively are
A
f + fr and f
B
f - fr and f
C
f - fr and f + fr
D
f + fr and f - fr
2
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
A 3 phase, 50 Hz, 6 pole induction motor has a rotor resistance of 0.1 Ω and reactance of 0.92 Ω. Neglect the voltage drop in stator and assume that the rotor resistance is constant. Given that the full load slip is 3%, the ratio of maximum torque to full load torque is
A
1.567
B
1.712
C
1.948
D
2.134
3
GATE EE 2013
MCQ (Single Correct Answer)
+2
-0.6
A 4-pole induction motor, supplied by a slightly unbalanced three-phase 50Hz source, is rotating at 1440 rpm. The electrical frequency in Hz of the induced negative sequence current in the rotor is
A
100
B
98
C
52
D
48
4
GATE EE 2012
MCQ (Single Correct Answer)
+2
-0.6
The locked rotor current in a 3-phase, star connected 15 kW, 4-pole, 230 V, 50 Hz induction motor at rated conditions is 50 A. Neglecting losses and magnetizing current, the approximate locked rotor line current drawn when the motor is connected to a 236 V, 57 Hz supply is
A
58.5 A
B
45.0 A
C
42.7 A
D
55.6 A
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