In the operation and control of both naturally commutated and forced commutated SCR base converter, commutation plays an important role. The converters is / are ___________?

A. A parallel combination of controllable switch and a diode is used
B. A parallel combination of controllable switch and capacitor is used
C. A series combination of controllable switch and a diode is used
D. A series combination of controllable switch and a capacitor is used

A. Identical to line voltage in a VSI
B. Identical to line current in VSI
C. Identical to phase voltage in VSI
D. Identical to phase voltage in CSI

A. low
B. High
C. moderate
D. infinity

A. A rectifier
B. An inverter
C. A chopper
D. A regulator

A. junction J2 is in reverse bias and J1, J3 is in forward bias.
B. junction J3 is in forward bias and J1, J2 is in reverse bias.
C. Junction J1, J3 is in reverse bias and J2 is in forward bias.
D. Junction J1 and J2 is in forward bias and J3 is in reverse bias.

A. Unidirectional
B. Bidirectional
C. Fixed voltage polarity
D. Only (a) and (c)