Curioustab

Home » Electronics and Communication Engineering » Power Electronics

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

Y - Y and Y - Y transformers
Δ - Δ and Δ - Δ transformers
Y - Y and Y - Δ transformers
Y - Δ and Y - Δ transformers

Correct Answer: Y - Y and Y - Δ transformers

Explanation:

30° phase difference is necessary.

← Previous Question Next Question→

More Questions from Power Electronics

In a step down chopper using pulse width modulation, Ton = 3 x 10-3 and Toff = 1 x 10-3 s. The chopping frequency is
A two winding transformer is feeding a single phase half wave rectifier circuit. The load is purely resistive. The rms value of transformer secondary current is Is and rms value of load current in Irms. Then
Assertion (A): Power transistor has lower switching time than SCR Reason (R): Power transistor has greater switching time than SCR
In a single phase full wave converter (M-2 connection) feeding on R - L load, the input voltage is v = Vm sin ωt. The expression for dc output voltage is
An SCR is triggered at 40° in the positive half cycle only. The average anode current is 50 A. If the firing angle is changed to 80°, the average anode current is likely to be
Assertion (A): The surge current which an SCR can withstand is much higher than rms on state current. Reason (R): The duration of surge current is very small.
A single phase half wave controlled rectifier circuit has a free wheeling diode. The load is a combination of R and L. The firing angle is a. The period of conduction of SCR and free wheeling diode respectively are
A thyristor has a turn on time of 6 μs. If the anode circuit is inductive, the turn on time will be
In a multiphase chopper, all choppers operate together.
The value of capacitor C for dynamic equalising circuit of series connected thyristors is determined by

Discussion & Comments

No comments yet. Be the first to comment!

Join Discussion