1
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 ____________. 2
GATE EE 2014 Set 2
Numerical
+1
-0
A step-up chopper is used to feed a load at $$400$$ $$V$$ $$dc$$ from a $$250$$ $$V$$ $$dc$$ source. The inductor current is continuous. If the ‘off’ time of the switch is $$20\,\,\mu s,$$ the switching frequency of the chopper in $$kHz$$ is ________.
3
GATE EE 2014 Set 2
+2
-0.6
A single-phase $$SCR$$ based $$ac$$ regulator is feeding power to a load consisting of $$5\,\,\Omega$$ resistance and $$16$$ $$mH$$ inductance. The input supply is $$230$$ $$V,$$ $$50$$ $$Hz$$ $$ac.$$ The maximum firing angle at which the voltage across the device becomes zero all throughout and the $$rms$$ value of current through $$SCR,$$ under this operating condition, are
A
$${30^0}$$ and $$46$$ $$A$$
B
$${30^0}$$ and $$23$$ $$A$$
C
$${45^0}$$ and $$23$$ $$A$$
D
$${45^0}$$ and $$32$$ $$A$$
4
GATE EE 2014 Set 2
Numerical
+1
-0
A single phase induction motor draws $$12MW$$ power at $$0.6$$ lagging power. A capacitor is connected in parallel to the motor to improve the power factor of the combination of motor and capacitor to $$0.8$$ lagging. Assuming that the real and reactive power drawn by the motor remains same as before, the reactive power delivered by the capacitor in MVAR is _______ .
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