Deck 7: The Polyphase Rectifier

Question 1

When using three-phase rectifiers, the average DC voltage output is ____ than the ____ value of the  AC voltage.

A) lower, RMS
B) higher, RMS
C) lower, peak
D) higher, peak

Answer 1

B

Question 2

Six-phase half wave rectifiers produce two times the ripple as a three-phase full-wave rectifier.

Answer 2

False

Question 3

There are two types of three-phase rectifiers: the half-wave and the bridge.

Answer 3

True

Question 4

The three-phase bridge rectifier is often used for industrial applications because it has less ____ than  the half-wave rectifier.

A) drain
B) resistance
C) inversion
D) ripple

Question 5

When a three-phase, half-wave rectifier is used, the average DC voltage can be computed by  multiplying the peak value of voltage by ____.

A) .827
B) 1.169
C) 1.414
D) 4.80

Question 6

When a multi-phase rectifier is used, it is generally connected as a ____.

A) half-wave rectifier
B) full-wave rectifier
C) half-wave inverter
D) half-phase transformer

Question 7

The ripple produced by changing AC voltage into DC voltage can be made much smoother by the use  of ____.

A) fillers
B) inverters
C) filters
D) capacitors

Question 8

The amount of ripple produced by a rectifier can become a matter of great importance; for this reason,   there are rectifiers that operate on 4, 8, or 16 phases.

Question 9

The three-phase bridge type rectifier has a higher average DC voltage than the three-phase, half-wave  rectifier.

Question 10

Industry is operated by three-phase power, so it is necessary to change three-phase alternating current  into direct current.