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GATE EE 2014 Set 3
MCQ (Single Correct Answer)
+2
-0.6
A three-phase fully controlled bridge converter is fed through star-delta transformer as shown in the figure. GATE EE 2014 Set 3 Power Electronics - Single and Three Phase Rectifier Question 22 English

The converter is operated at a firing angle of $${30^0}.$$ Assuming the load current $$\left( {{{\rm I}_0}} \right)$$ to be virtually constant at $$1$$ $$p.u.$$ and transformer to be an ideal one, the input phase current waveform is

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GATE EE 2014 Set 3 Power Electronics - Single and Three Phase Rectifier Question 22 English Option 1
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GATE EE 2014 Set 3 Power Electronics - Single and Three Phase Rectifier Question 22 English Option 2
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GATE EE 2014 Set 3 Power Electronics - Single and Three Phase Rectifier Question 22 English Option 3
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GATE EE 2014 Set 3 Power Electronics - Single and Three Phase Rectifier Question 22 English Option 4
2
GATE EE 2014 Set 3
Numerical
+2
-0
A diode circuit feeds an ideal inductor as shown in the figure. Given $${V_s} = 100\,\,\sin \,\left( {\omega t} \right)V,$$ where $$\omega = 100\pi $$ rad/s, and $$L=31.83$$ $$mH$$. The initial value of inductor current is zero. Switch $$S$$ is closed at $$t=2.5$$ $$ms.$$ The peak value of inductor current $${i_L}\left( {in\,\,A} \right)$$ in the first cycle is __________. GATE EE 2014 Set 3 Power Electronics - Single and Three Phase Rectifier Question 21 English
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3
GATE EE 2014 Set 2
Numerical
+2
-0
A fully controlled converter bridge feeds a highly inductive load with ripple free load current. The input supply $$\left( {{V_s}} \right)$$ to the bridge is a sinusoidal source. Triggering angle of the bridge converter is $$\,\alpha = {30^0}.$$ The input power factor of the bridge is ____________. GATE EE 2014 Set 2 Power Electronics - Single and Three Phase Rectifier Question 23 English
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4
GATE EE 2014 Set 1
Numerical
+2
-0
The figure shows the circuit diagram of a rectifier. The load consists of a resistance $$10\,\Omega $$ and an inductance $$0.05$$ $$H$$ connected in series. Assuming ideal thyristor and ideal diode, the thyristor firing angle (in degree) needed to obtain an average load voltage of $$70$$ $$V$$ is _______________. GATE EE 2014 Set 1 Power Electronics - Single and Three Phase Rectifier Question 24 English
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