1
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).
2
GATE EE 2017 Set 1
Numerical
+2
-0
The figure below shows an uncontrolled diode bridge rectifier supplied form a $$220$$ Z$$V,$$ $$50$$ $$Hz,$$ $$1$$-phase $$ac$$ source. The load draws a constant $${{\rm I}_0}$$ $$=14A.$$ The conduction angle of the diode $${D_1}$$ in degrees (rounded off to two decimal places) is ______________.
3
GATE EE 2016 Set 2
Numerical
+2
-0
A full-bridge converter supplying an RLE load is shown in figure. The firing angle of the bridge converter is 120º. The supply voltage $${v_m}\left( t \right) = 200\pi \sin \left( {100\pi t} \right)\,V,$$$$$R = 20 Ω, E = 800 V$$$The inductor L is large enough to make the output current IL a smooth dc current. Switches are lossless. The real power fed back to the source, in kW, is __________.
4
GATE EE 2016 Set 2
Numerical
+2
-0
A single-phase bi-directional voltage source converter (VSC) is shown in the figure below. All devices are ideal. It is used to charge a battery at 400 V with power of 5 kW from a source Vs = 220 V (rms), 50 Hz sinusoidal AC mains at unity p.f. If its AC side interfacing inductor is 5 mH and the switches are operated at 20 kHz, then the phase shift (δ) between AC mains voltage (Vs) and fundamental AC rms VSC voltage (VC1), in degree, is _________.