Electronics for electricians 7th edition herman test bank

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Unit 7 — The Polyphase Rectifier

TRUE/FALSE 1. Industry is operated by three-phase power, so it is necessary to change three-phase alternating current into direct current.

ANS: T

PTS: 1

REF: Introduction

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

ANS: T

PTS: 1

REF: Introduction

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

ANS: T

PTS: 1

REF: The Bridge Rectifier

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

ANS: F

PTS: 1

REF: Applications

5. 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.

ANS: F

PTS: 1

REF: Applications

MULTIPLE CHOICE 1. The three-phase bridge rectifier is often used for industrial applications because it has less ____ than the half-wave rectifier. a. drain c. inversion b. resistance d. ripple ANS: D

PTS: 1

REF: The Half-Wave Rectifier

2. 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 c. 1.414 b. 1.169 d. 4.80 ANS: A

PTS: 1

REF: Average Voltage Calculations

3. When using three-phase rectifiers, the average DC voltage output is ____ than the ____ value of the AC voltage. a. lower, RMS c. lower, peak b. higher, RMS d. higher, peak ANS: B

PTS: 1

REF: Average Voltage Calculations

4. The ripple produced by changing AC voltage into DC voltage can be made much smoother by the use of ____. a. fillers c. filters

b. inverters ANS: C

d. capacitors PTS: 1

REF: Average Voltage Calculations

5. When a multi-phase rectifier is used, it is generally connected as a ____. a. half-wave rectifier c. half-wave inverter b. full-wave rectifier d. half-phase transformer ANS: A

PTS: 1

REF: Applications