Question 1

-What is the ripple voltage across the load?

Accepted Answer

A)  0.25 V 
B)  0.126 V 
C)  121 mV 
D)  76 mV 
A)  0.25 V 
B)  0.126 V 
C)  121 mV 
D)  76 mV C

Question 2

When troubleshooting a rectifier, it is important to check every diode in the rectifier.

Accepted Answer

A) True 
 B)False  True

Question 3

. For the transformer shown, which current and voltage have the greatest values?

Accepted Answer

A)  IP and VP 
B)  IS and VS 
C)  IP and VS 
D)  IS and VP 
A)  IP and VP 
B)  IS and VS 
C)  IP and VS 
D)  IS and VP C

Question 4

A rectifier is used to

Accepted Answer

A)  convert ac to pulsating dc. 
B)  reduce the variations in a pulsating dc signal. 
C)  maintain a constant power supply dc output voltage. 
D)  convert one dc level to another. 
A)  convert ac to pulsating dc. 
B)  reduce the variations in a pulsating dc signal. 
C)  maintain a constant power supply dc output voltage. 
D)  convert one dc level to another.

Question 5

-What is the value of IZ for the circuit?

Accepted Answer

A)  40 mA 
B)  38 mA 
C)  20 mA 
D)  2 mA 
A)  40 mA 
B)  38 mA 
C)  20 mA 
D)  2 mA

Question 6

The most commonly used type of rectifier is the

Accepted Answer

A)  half-wave rectifier. 
B)  full-wave rectifier. 
C)  bridge rectifier. 
A)  half-wave rectifier. 
B)  full-wave rectifier. 
C)  bridge rectifier.

Question 7

A positive full-wave rectifier has a secondary voltage of 20 Vpk. The peak load voltage for the circuit is

Accepted Answer

A)  20 Vpk. 
B)  9.3 Vpk. 
C)  19.3 Vpk. 
D)  10 Vpk. 
A)  20 Vpk. 
B)  9.3 Vpk. 
C)  19.3 Vpk. 
D)  10 Vpk.

Question 8

-A transformer with a 10:1 turns ratio has a 120 Vac line input. The transformer secondary is connected to a half-wave rectifier circuit using a capacitor filter. Ignoring any ripple, what is the dc output voltage from the circuit?

Accepted Answer

A)  16.3 V 
B)  10.4 V 
C)  5.7 V 
D)  3.6 V 
A)  16.3 V 
B)  10.4 V 
C)  5.7 V 
D)  3.6 V

Question 9

-Identify the power supply circuits represented in Figure .

Accepted Answer

A)  A= transformer, B= rectifier, C= regulator, D= filter 
B)  A= transformer, B= regulator, C= filter, D= rectifier 
C)  A= filter, B= transformer, C= rectifier, D= regulator 
D)  A= transformer, B= rectifier, C = filter, D= regulator 
A)  A= transformer, B= rectifier, C= regulator, D= filter 
B)  A= transformer, B= regulator, C= filter, D= rectifier 
C)  A= filter, B= transformer, C= rectifier, D= regulator 
D)  A= transformer, B= rectifier, C = filter, D= regulator

Question 10

-What is the value of the load current?

Accepted Answer

A)  14.1 mA 
B)  7.1 mA 
C)  6.8 mA 
D)  4.3 mA 
A)  14.1 mA 
B)  7.1 mA 
C)  6.8 mA 
D)  4.3 mA

Question 11

-When testing a basic power supply, you see that the primary fuse is blown. This typically indicates that

Accepted Answer

A)  a short exists somewhere in the power supply. 
B)  an open exists somewhere in the power supply. 
C)  the fuse itself is the most likely cause of the circuit failure. 
D)  Any of the above conditions could exist. 
A)  a short exists somewhere in the power supply. 
B)  an open exists somewhere in the power supply. 
C)  the fuse itself is the most likely cause of the circuit failure. 
D)  Any of the above conditions could exist.

Question 12

A full-wave rectifier has a 9.3 Vpk output and a 4.7 kΩ load resistance. What is the dc load current for the circuit?

Accepted Answer

A)  1.26 mA 
B)  2.61 mA 
C)  629.8 μA 
D)  1.4 mA 
A)  1.26 mA 
B)  2.61 mA 
C)  629.8 μA 
D)  1.4 mA

Question 13

A negative half-wave rectifier eliminates the alternations of the transformer output.

Accepted Answer

A)  positive 
B)  negative 
A)  positive 
B)  negative

Question 14

A voltage regulator

Accepted Answer

A)  maintains a constant power supply dc output voltage. 
B)  steps up or steps down the line voltage. 
C)  reduces the variations in ac line voltage. 
D)  Both A and C above. 
A)  maintains a constant power supply dc output voltage. 
B)  steps up or steps down the line voltage. 
C)  reduces the variations in ac line voltage. 
D)  Both A and C above.

Question 15

Why is the bridge rectifier used more commonly than the full-wave rectifier?

Accepted Answer

A)  It does not require the use of a center-tapped transformer. 
B)  With equal input voltages, the bridge rectifier provides a higher dc output voltage. 
C)  The bridge rectifier can be directly coupled to an ac line input. 
D)  All of the above. 
A)  It does not require the use of a center-tapped transformer. 
B)  With equal input voltages, the bridge rectifier provides a higher dc output voltage. 
C)  The bridge rectifier can be directly coupled to an ac line input. 
D)  All of the above.

Question 16

In the schematic for a half-wave rectifier , the diode points toward the ungrounded side of the load. The output from the rectifier is

Accepted Answer

A)  positive. 
B)  negative. 
C)  either positive or negative, depending on the polarity of the transformer secondary voltage. 
A)  positive. 
B)  negative. 
C)  either positive or negative, depending on the polarity of the transformer secondary voltage.

Question 17

A 22 μF filter capacitor is connected to a half-wave rectifier. If the value of the capacitor is increased to 100 μF, the ripple in the circuit output will

Accepted Answer

A)  increase. 
B)  decrease. 
C)  remain the same. 
A)  increase. 
B)  decrease. 
C)  remain the same.

Question 18

A bridge rectifier has values of V1 = 120 Vac, turns ratio = 5:1, and RL = 500 Ω. What is the dc output voltage?

Accepted Answer

A)  14.4 Vdc 
B)  7.19 Vdc 
C)  20.8 Vdc 
D)  22.6 Vdc 
A)  14.4 Vdc 
B)  7.19 Vdc 
C)  20.8 Vdc 
D)  22.6 Vdc

Question 19

A half-wave rectifier is connected to a transformer with a secondary voltage of 20 Vpk. The average output voltage is

Accepted Answer

A)  19.3 Vdc. 
B)  13.7 Vdc. 
C)  6.14 Vdc. 
D)  12.3 Vdc. 
A)  19.3 Vdc. 
B)  13.7 Vdc. 
C)  6.14 Vdc. 
D)  12.3 Vdc.

Question 20

A filtered half-wave rectifier has a peak secondary voltage of 20 Vpk. The PIV rating for any diode in the circuit must be at least

Accepted Answer

A)  20 V. 
B)  30 V. 
C)  10 V. 
D)  40 V. 
A)  20 V. 
B)  30 V. 
C)  10 V. 
D)  40 V.

Exam 3: Common Diode Applications: Basic Power Supply Circuits

-What is the ripple voltage across the load?

When troubleshooting a rectifier, it is important to check every diode in the rectifier.

. For the transformer shown, which current and voltage have the greatest values?

A rectifier is used to

-What is the value of IZ for the circuit?

The most commonly used type of rectifier is the

A positive full-wave rectifier has a secondary voltage of 20 Vpk. The peak load voltage for the circuit is

-A transformer with a 10:1 turns ratio has a 120 Vac line input. The transformer secondary is connected to a half-wave rectifier circuit using a capacitor filter. Ignoring any ripple, what is the dc output voltage from the circuit?

-Identify the power supply circuits represented in Figure .

-What is the value of the load current?

-When testing a basic power supply, you see that the primary fuse is blown. This typically indicates that

A full-wave rectifier has a 9.3 Vpk output and a 4.7 kΩ load resistance. What is the dc load current for the circuit?

A negative half-wave rectifier eliminates the alternations of the transformer output.

A voltage regulator

Why is the bridge rectifier used more commonly than the full-wave rectifier?

In the schematic for a half-wave rectifier , the diode points toward the ungrounded side of the load. The output from the rectifier is

A 22 μF filter capacitor is connected to a half-wave rectifier. If the value of the capacitor is increased to 100 μF, the ripple in the circuit output will

A bridge rectifier has values of V1 = 120 Vac, turns ratio = 5:1, and RL = 500 Ω. What is the dc output voltage?

A half-wave rectifier is connected to a transformer with a secondary voltage of 20 Vpk. The average output voltage is

A filtered half-wave rectifier has a peak secondary voltage of 20 Vpk. The PIV rating for any diode in the circuit must be at least

Fundamental Solid-State Principles

Diodes

Common Diode Applications: Clippers, Clampers, Voltage Multipliers, and Displays

Special Applications Diodes

Bipolar Junction Transistors

DC Biasing Circuits

Introduction to Amplifiers

Common-Emitter Amplifiers

Other BJT Amplifiers

Power Amplifiers

Field-Effect Transistors

Mosfets

Amplifier Frequency Response

Operational Amplifiers

Additional Op-Amp Applications

Tuned Amplifiers

Oscillators

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters