1
GATE EE 2014 Set 1
Numerical
+1
-0
An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 700 rpm. The frequency of the rotor current of the motor in Hz is ________.
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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 2014 Set 1
Numerical
+1
-0
A star connected 400 V, 50 Hz, 4 pole synchronous machine gave the following open circuit and short circuit test results:
Open circuit test: VOC = 400 V (rms, line–to–line) at field current, If = 2.3 A
Short circuit test: ISC = 10 A(rms, phase) at field current, If =1.5 A
The value of per phase synchronous impedance in Ω at rated voltage is __________.
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4
GATE EE 2014 Set 1
MCQ (Single Correct Answer)
+2
-0.6
A three phase synchronous generator is to be connected to the infinite bus. The lamps are connected as shown in the figure for the synchronization. The phase sequence of bus voltage is $$R$$-$$Y$$-$$B$$ and that of incoming generator voltage is $$R'$$ - $$Y'$$ - $$B'.$$ GATE EE 2014 Set 1 Electrical Machines - Synchronous Machines Question 22 English

It was found that the lamps are becoming dark in the sequence $${L_a} - {L_b} - {L_c}.$$ It means that the phase sequence of incoming generator is

A
opposite to infinite bus and its frequency is more than infinite bus
B
opposite to infinite bus but its frequency is less than infinite bus
C
same as infinite bus and its frequency is more than infinite bus
D
same as infinite bus and its frequency is less than infinite bus
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