1
GATE EE 2017 Set 2
Numerical
+2
-0
If the primary line voltage rating is 3.3 kV (Y side) of a 25 kVA. $$Y-\triangle$$ transformer (the per phase turns ratio is 5:1), then the line current rating of the secondary side (in Ampere) is_______.
2
GATE EE 2017 Set 2
+1
-0.3
A 3-phase, 4-pole, 400 V, 50 Hz squirrel-cage induction motor is operating at a slip of 0.02. The speed of the rotor flux in mechanical rad/sec, sensed by a stationary observer, is closest to
A
1500
B
1470
C
157
D
154
3
GATE EE 2017 Set 2
Numerical
+2
-0
A star-connected, 12.5 kW, 208 V (line), 3-phase, 60 Hz squirrel cage induction motor has following equivalent circuit parameters per phase referred to the stator. R1 = 0.3 Ω, R2 = 0.3 Ω, X1 = 0.41 Ω, X2 = 0.41 Ω. Neglect shunt branch in the equivalent circuit. The starting current (in Ampere) for this motor when connected to an 80 V (line), 20 Hz, 3- phase AC source is __________.
4
GATE EE 2017 Set 2
+1
-0.3
If a synchronous motor is running at a leading power factor, its excitation induced voltage (Er) is
A
equal to terminal voltage Vt
B
higher than the terminal voltage Vt
C
less than terminal voltage Vt
D
dependent upon supply voltage Vt
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