Electrical Machine - IES Academy
Electrical Machine - IES Academy
Electrical Machine - IES Academy
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India’s No. 1<br />
<strong>IES</strong> <strong>Academy</strong><br />
Transformer<br />
Chapter-1<br />
Common Data for Questions Q8 and Q9:<br />
The circuit diagram shows a two-winding, lossless transformer with no leakage flux,<br />
excited from a current source, i(t), whose waveform is also shown. The transformer<br />
has a magnetizing inductance of 400/π mH.<br />
GATE-8. The peak voltage across A and B, with S open is: [GATE-2009]<br />
400<br />
(a) (b) 800V (c) 4000<br />
(d) 800<br />
πV πV<br />
πV<br />
GATE-9. If the waveform of i(t) is changed to i(t) = 10sin (100 πt)<br />
A, the peak<br />
voltage across A and B with S closed is:<br />
[GATE-2009]<br />
(a) 400 V (b) 240 V (c) 320 V (d) 160 B<br />
Three Phase Transformers<br />
GATE-10. Figure shows a Δ -Y connected 3-<br />
phase distribution transformer used<br />
to step down the voltage from 11 000 V<br />
to 4 15 V line-to-line. It has two<br />
switches S1 & S2. Under normal<br />
conditions S1 is closed and S2 is open.<br />
Under certain superior conditions S1<br />
is open and S2 is closed. In such a case<br />
the magnitude of the voltage across<br />
the LV terminals a and c is:<br />
[GATE– 2003]<br />
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