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.Management Sciences
Category: Power Electronics
Rise time is defined by the interval when____________?
A. gate current rises from 90 % to 100 % of it final value
B. anode voltage drops from 90 % to 10 % of its initial value
C. anode current rises 10 % to 90 % of its final value
D. both B and C
The maximum di/dt in a SCR is____________?
A. Directly proportional to supply voltage
B. Directly proportional to inductance in the circuit
C. Inversely proportional to supply voltage
D. Both A and B
The control method used for PWM dc – dc converter is______________?
A. Voltage mode control
B. Current mode control
C. Hysteric control
D. All of these
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?
A. 30° to 150°.
B. 30° to 180°.
C. 60° to 120°.
D. 60° to 180°.
A MOSFET, for its conduction uses_____________?
A. Only minority carriers
B. Only majority carriers
C. Both minority and majority carriers
D. None of these
In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a___________?
A. Linear function
B. Non linear function
C. Constant function
D. None of these
In radiative coupling, the emitter radiation field_____________?
A. Decays as 1 / R, where R is the separation distance between the emitter and the receptor
B. Decays as R, where R is the separation distance between the emitter and the receptor
C. Decays as 1 / 2 R, where R is the separation distance between the emitter and the receptor
D. Decays as 2R, where R is the separation distance between the emitter and the receptor
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?
A. Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
B. Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
C. Vc1 = Vc2 = Vc3 any value of Ig.
D. Vc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &Atil
n a phase controlled 3 phase ac voltage controller, the harmonic present is__________?
A. 2nd
B. 3rd
C. 5th
D. 7th
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