UP polytechnic Lecturer (EE) Quiz 8

Neutral wire connection is:

For 600 Hz frequency in output, the B-6 converter must have a input frequency of

In a 3-phase half wave controlled converter with resistive load. If the firing angle ∝=20°. Then each thyristor will start conducting from.

The RMS output voltage of lowest harmonic component in a step-down chopper if the output voltage is 20V & the width of pulse is 1/6^th of the total time period.

Out of the following Power Electronic devices, which is not a current triggering device?

In the figure shown below the duty ratio of buck convertor is D₁ and the duty ratio of boost convertor is D₂. The input voltage of buck convertor is 10 V, and the output voltage of boost convertor is 30 V. Which of the following equation satisfy the relation between D₁ and D₂.

The input voltage to 3-phase inverter, if load resistance is 10ohm and the variation of thyristor current is same as the below figure.

Below figure shows the output voltage waveform of resistive load. The shown waveform can be obtained by (where T is time period).

The Boundary conditions for M-3 and B-6 converters are respectively.

A thyristor switching circuit is shown below. The thyristor is rated for a latching current of 5 mA and is turned on within 5 sec. the value of inductance is