Q. Which of the following is correct for a BJT?

View solution

Q. A fully controlled bridge converter is feeding an RLE load. The load current is I₀. The input voltage is Vm sin ωt. The KVL equation to find firing angle α is

View solution

Q. The duty cycle of a step down chopper is

View solution

Q. A rectifier is fed by a transformer. The rms voltage and current at secondary of transformer are Vs and Is. Output dc power is Vdc Idc and output ac power is (Vrms ) (Irms), Transformer utilisation factor TUF is

View solution

Q. If Ar and Ac are the amplitudes of reference and control signals, the modulation index M is

View solution

Q. For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is for

View solution

Q. A single phase fully controlled bridge converter is feeding an RLE load. Input voltage is Vm sin ωt and firing angle is α. If average current is I₀, then

View solution

Q. Which of the following is not between F2 layer and D layer?

View solution

Q. A cycloconverter can be

View solution

Q. In a 3 phase fully controlled converter the firing frequency is

View solution

Q. Two thyristor of same rating and same specifications

View solution

Q. The amount of dielectric heating is inversely proportional to frequency.

View solution

Q. A semiconverter feeding an RLE load operates in

View solution

Q. The phenomenon of overlap in converter operation due to

View solution

Q. A thyristor has a maximum allowable junction temperature of 120°C and the ambient temperature is 40°C. If thermal resistance is 1.6° C/W, the maximum allowable internal power dissipation is

View solution

Q. For a 12 pulse operation, the two 6 pulse units are fed by

View solution

Q. In a single phase full wave converter (M - 2 connection) feeding a highly inductive load, the firing angle for each thyristor is a in the respective half cycle. The period of conduction of each thyristor is

View solution

Q. If Vdc1 is the dc output voltage in half wave controlled rectifier circuit feeding resistive load and Vdc2 is the dc output voltage in full wave controlled rectifier circuit (M - 2 connection) feeding resistive load, then

View solution

Q. A semi converter operates in two quadrants.

View solution

Q. Assertion (A): An ideal rectifier should have unity harmonic factor

Reason (R): An ideal rectifier should have unity displacement factor.

View solution