1
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
GATE EE 2009 Electrical Machines - Transformers Question 16 English

The star-delta transformer shown above is excited on the star side with balanced, $$4$$-wire, $$3$$-phase, sinusoidal voltage supply of rated magnitude. The transformer is under no load condition.

With $$S2$$ closed and $$S1$$ open, the current waveform in the delta winding will be

A
a sinusoidal at fundamental frequency
B
flat-topped with third harmonic
C
only third-harmonic
D
none of these
2
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
The circuit diagram shows a two-winding, lossless transformer with no leakage flux, excited from a current source, $$i(t)$$, whose waveform is also shown. The transformer has a magnetizing inductance of $$400/\pi \,\,mH.$$ GATE EE 2009 Electrical Machines - Transformers Question 13 English 1 GATE EE 2009 Electrical Machines - Transformers Question 13 English 2

If the waveform of $$i\left( t \right) = 10\sin \left( {100\pi t} \right)A,$$ the peak voltage across $$A$$ and $$B$$ with $$S$$ closed is

A
$$400$$ $$V$$
B
$$240$$ $$V$$
C
$$320$$ $$V$$
D
$$160$$ $$V$$
3
GATE EE 2009
MCQ (Single Correct Answer)
+2
-0.6
The circuit diagram shows a two-winding, lossless transformer with no leakage flux, excited from a current source, $$i(t)$$, whose waveform is also shown. The transformer has a magnetizing inductance of $$400/\pi \,\,mH.$$ GATE EE 2009 Electrical Machines - Transformers Question 14 English 1 GATE EE 2009 Electrical Machines - Transformers Question 14 English 2

The peak voltage across $$A$$ and $$B$$, with $$S$$ open is

A
$${{400} \over \pi }V$$
B
$$800$$ $$V$$
C
$${{4000} \over \pi }V$$
D
$${{800} \over \pi }V$$
4
GATE EE 2008
MCQ (Single Correct Answer)
+2
-0.6
Three single-phase transformers are connected to form a $$3$$-phase transformer bank. The transformers are connected in the following manner. GATE EE 2008 Electrical Machines - Transformers Question 18 English

The transformer connection will be represented by

A
$$Yd0$$
B
$$Yd1$$
C
$$Yd6$$
D
$$Yd11$$
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