Test: Power Electronics - 3 - Electrical Engineering (EE) MCQ
25 Questions MCQ Test - Test: Power Electronics - 3
In a dual converter both converters work as rectifiers.
A single phase full wave regulator feeds R-L load. The best gating signal is
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A 3 phase induction motor is fed by a 3 phase ac regulator to change the stator voltage. The variation in speed will be more if
A cycloconverter cannot give a frequency higher than input frequency.
A thyristor has internal power dissipation of 40W and is operated at an ambient temperature of 20ºC. If thermal resistance is 1.6º C/W, the junction temperature is
.A single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is v = Vm sin ωt. The thyristor will conduct
A thyristor has its gate current zero. To start conduction the forward voltage must exceed
On load tap changer using thyristors can have a maximum of two taps.
Assertion (A): Snubber circuit has an RC series circuit in parallel with SCR
Reason (R): Voltage across a capacitor can not change instantaneously.
.In dielectric heating, the thyristor circuits consist of
Assertion (A): A cycloconverter may be line commutated or forced commutated
Reason (R): A step up cycloconverter requires forced commutation.
In the below figure the rms voltage across each half of secondary is 200 V. The peak inverse voltage across each of thyristor is 
Assertion (A): A GTO circuit is more compact than SCR circuit
Reason (R): A GTO can be turned off by negative gate pulse.
In a single phase full bridge converter (B - 2 connection), the input voltage is v = Vm sin ωt. The output dc voltage for resistive load
In a single phase full wave ac regulator, the firing angles in the two half cycles
A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is
.A single phase fully controlled bridge rectifier is fed by a source having inductance. The output voltage during overlap period is
In a semi converter feeding a resistive load, the firing angle is a. Each thyristor conducts for
Between which points does UJT exhibit negative resistance characteristics
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