1
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A permanent magnet dc commutator motor has a no load speed of 6000 rpm when connected to a 120V dc supply. The armature resistance is 2.5 ohms and other losses may be neglected. The speed of the motor with supply voltage of 60V developing a torque 0.5 Nm, is:
A
3000 rpm
B
2673 rpm
C
2836 rpm
D
5346 rpm
2
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
In a constant voltage transformer (CVT), the output voltage remains constant due to
A
capacitor
B
input inductor
C
saturation
D
tapped windings
3
GATE EE 2000
MCQ (Single Correct Answer)
+1
-0.3
If an ac voltage wave is corrupted with an arbitrary number of harmonics, then the overall voltage waveform differs from its fundamental frequency component in terms of
A
only the peak values
B
only the rms values
C
only the average values
D
all the three measures (peak, rms and average values)
4
GATE EE 2000
MCQ (Single Correct Answer)
+2
-0.6
A 3-phase delta/star transformer is supplied at 6000 V on the delta-connected side. The terminal voltage on the secondary side when supplying full load as 0.8 lagging power-factor is 415 V. The equivalent resistance and reactance drops for the transformer are 1% and 5% respectively. The turn's ratio of the transformer is:
A
14
B
24
C
42
D
20
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