Test: Power Electronics - 7 - Electrical Engineering (EE) MCQ
25 Questions MCQ Test - Test: Power Electronics - 7
Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode
Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel
In a single phase full wave controlled rectifier using centre tap transformer, the voltage across each half of secondary is Vm sin ωt. The peak inverse voltage is
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In a three phase series inverter, the firing frequency is
In a half bridge inverter the gate pulses of the two thyristors have a phase displacement of
A fully controlled bridge converter can operate in quadrants
Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.
Reason (R): A semi converter is cheaper than a full converter.
When a thyristor is conducting, the voltage drop across it is about
The use of free wheeling diode in controlled rectifier improves the waveshape of load current.
As the firing of a thyristor is delayed, the output voltage of a controlled rectifier decreases.
Assertion (A): A GTO can be turned on and turned off by gate pulses
Reason (R): A GTO can be turned off by negative gate pulse.
In a half bridge inverter circuit fed by a battery of voltage V, the rms value of fundamental component of output voltage is
In a full bridge single phase inverter feeding RLC load
Assertion (A): When the anode current of an SCR starts increasing during turn on process, the anode cathode voltage drop starts decreasing.
Reason (R): During turn on the reverse biased junction in SCR breaksdown.
In a certain inverter circuit each thyristor carries 26.67 A for 60º, 13.33 A for 120º and zero A for 180º of the cycle. The rms current of thyristor is
In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is
The cut in voltages for germanium and silicon diodes respectively as
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