Power Electronics

The ____________ region in a power diode increases its reverse voltage blocking capacity.

• pn junction

• drift

• potential barrier

• depletion layer

The maximum DC voltage rating (VRDC) of a power diode is useful for selecting ________________ diodes in a DC-DC chopper.

• snubber diodes

• reverse recovery diodes

• freewheeling diodes

• fast recovery diodes

The i-v characteristics of a power diode for large forward current is __________ .

• straight line

• linear

• nonlinear

• parabolic

Forward recovery voltage appears due to higher ohmic drop in the ______________ region of a power diode in the beginning of the Turn On process.

• forward

• reverse

• drift

• potential barrier

The magnitude of the forward recovery voltage is typically of the order of few ______________ of volts.

• ones

• tens

• hundreds

• thousands

For a given forward current the reverse recovery current of a Power Diode ______________ with the rate of decrease of the forward current.

• decreases

• constant

• increases

• none of the above

For a given forward current the reverse recovery time of a Power diode ______________ with the rate of decrease of the forward current.

• decreases

• increases

• remains constant

• none of the above

A “snappy” recovery diode is subjected to _________________ voltage over shoot on recovery.

• small

• large

• constant

• none of the above

A fast recovery diode has _______________________ reverse recovery current and time compared to a __________________ recovery diode.

• large, reverse

• small, reverse

• both (a) and (b)

• none of the above

A Schottky diode has _______________ forward voltage drop and ______________ reverse voltage blocking capacity.

• low, high

• high, low

• low, low

• high, high