1
GATE EE 2018
MCQ (Single Correct Answer)
+1
-0.3
A single-phase 100 kVA, 1000 V / 100 V, 50 Hz transformer has a voltage drop of 5% across its series impedance at full load. Of this, 3% is due to resistance. The percentage regulation of the transformer at full load with 0.8 lagging power factor is
A
4.8
B
6.8
C
8.8
D
10.8
2
GATE EE 2016 Set 2
Numerical
+1
-0
The following figure shows the connection of an ideal transformer with primary to secondary turns ratio of 1 : 100. The applied primary voltage is 100 V (rms), 50 Hz, AC. The rms value of the current I, in ampere, is __________.
Your input ____
3
GATE EE 2016 Set 1
MCQ (Single Correct Answer)
+1
-0.3
If an ideal transformer has an inductive load element at port 2 as shown in the figure below, the equivalent inductance at port 1 is
A
nL
B
n2L
C
$$\frac{\mathrm n}{\mathrm L}$$
D
$$\frac{\mathrm n^2}{\mathrm L}$$
4
GATE EE 2015 Set 1
MCQ (Single Correct Answer)
+1
-0.3
The self inductance of the primary winding of a single phase, 50 Hz, transformer is 800 mH, and that of the secondary winding is 600 mH. The mutual inductance between these two windings is 480 mH. The secondary winding of this transformer is short circuited and the primary winding is connected to a 50 Hz, single phase, sinusoidal voltage source. The current flowing in both the winding is less than their respective rated currents. The resistance of both windings can be neglected. In this connection, what is the effective inductance (in mH) seen by the source?
A
416
B
440
C
200
D
920
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