Q. The symbol in figure is for

View solution

Q. In a parallel inverter the turn off time tq of thyristor and values of commutating elements L and C are related as

View solution

Q. The symbol in figure is for

View solution

Q. If peak value of input voltage is Vm and firing angle is α, the average output voltage for single phase half wave and single phase full wave regulators are

View solution

Q. Assertion (A): The circuit of figure thyristor will conduct for 180° during positive half cycle if it is continuously fired.

Reason (R): A thyristor can conduct only when it is forward biased.

View solution

Q. In the below figure, the load is highly inductive. The firing angle is a for each of the thyristors. The periods of conduction of Th1 and Th2 respectively are

View solution

Q. The condition for underdamped oscillations in a series RLC circuit is

View solution

Q. A single phase fully controlled bridge converter is fed by a voltage Vm sin ωt. The average and rms values of output voltage are

View solution

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