1
GATE EE 2018
MCQ (Single Correct Answer)
+1
-0.3
Four power semiconductor devices are shown in the figure along with their relevant terminals. The device(s) that can carry dc current continuously in the direction shown when gated appropriately is (are)
A
Triac only
B
Triac and MOSFET
C
Triac and GTO
D
Thyristor and Triac
2
GATE EE 2018
Numerical
+1
-0.33
The waveform of the current drawn by a semi-converter from a sinusoidal AC voltage source is shown in the figure. If I0 = 20 A, the rms value of fundamental component of the current is ___________A (up to 2 decimal places).
3
GATE EE 2018
Numerical
+2
-0.67
A phase controlled single phase rectifier, supplied by an AC source, feeds power to an R-L-E load as shown in the figure. The rectifier output voltage has an average value given by $${V_0} = {{{V_m}} \over {2\pi }}\left( {3 + \cos \alpha } \right)$$, where $${V_m} = 80\pi$$ volts and $$\alpha$$ is the firing angle. If the power delivered to the lossless battery is 1600 W, $$\alpha$$ in degree is________ (up to 2 decimal places).
4
GATE EE 2018
MCQ (Single Correct Answer)
+1
-0.33
A single phase fully controlled rectifier is supplying a load with an anti-parallel diode as shown in the figure. All switches and diodes are ideal. Which one of the following is true for instantaneous load voltage and current?
A
$${v_0} \ge 0\,\,\& \,\,{i_0} < 0$$
B
$${v_0} < 0\,\,\& \,\,{i_0} < 0$$
C
$${v_0} \ge 0\,\,\& \,\,{i_0} \ge 0$$
D
$${v_0} < 0\,\,\& \,\,{i_0} \ge 0$$
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