Question 1

Ideally, line regulation is 100%.

Accepted Answer

A) True 
 B)False  False

Question 2

Of the following types, the most efficient regulator is a(n)

Accepted Answer

A) shunt regulator 
B) IC switching regulator 
C) 7805 IC regulator 
D) series regulator 
A) shunt regulator 
B) IC switching regulator 
C) 7805 IC regulator 
D) series regulator B

Question 3

Foldback current limiting differs from normal current limiting in that excessive output current will

Accepted Answer

A) shut off the power supply 
B) maintain the maximum allowed current but not exceed it 
C) be shunted to ground by the current limiting circuit 
D) reduce the output current limit 
A) shut off the power supply 
B) maintain the maximum allowed current but not exceed it 
C) be shunted to ground by the current limiting circuit 
D) reduce the output current limit D

Question 4

Figure 3 Assume ideal components.
-Refer to Figure 3. Assume VIN can vary between +15 V and +18 V. To obtain an output of +12 V, the duty cycle must vary between

Accepted Answer

A) 80% and 90% 
B) 33% and 67% 
C) 67% and 80% 
D) 20% and 33% 
A) 80% and 90% 
B) 33% and 67% 
C) 67% and 80% 
D) 20% and 33%

Question 5

Switching regulators can step- up, step down, or invert the output.

Accepted Answer

A) True 
 B)False

Question 6

High temperature can change the output of a regulated power supply.

Accepted Answer

A) True 
 B)False

Question 7

Figure 6
-Refer to Figure 6. Ignoring IADJ, the output voltage range is approximately

Accepted Answer

A) 1.75 V to 15.6 V 
B) 1.00 V to 11.2 V 
C) 1.50 V to 13.4 V 
D) 1.25 V to 12.4 V 
A) 1.75 V to 15.6 V 
B) 1.00 V to 11.2 V 
C) 1.50 V to 13.4 V 
D) 1.25 V to 12.4 V

Question 8

A 12 V power supply has ROUT of 20 m▲ at a maximum current of 1.5 A. The load regulation is

Accepted Answer

A) 0.25% 
B) 0.75% 
C) 0.5% 
D) none of the above 
A) 0.25% 
B) 0.75% 
C) 0.5% 
D) none of the above

Question 9

The current sensor for a current limiting circuit is a

Accepted Answer

A) series resistor 
B) comparator 
C) series transistor 
D) zener diode 
A) series resistor 
B) comparator 
C) series transistor 
D) zener diode

Question 10

The VREF of a series regulator must be equal to VOUT.

Accepted Answer

A) True 
 B)False

Question 11

Figure 4
-Refer to Figure 4. The type of regulator is a

Accepted Answer

A) inverting switching regulator 
B) step- up switching regulator 
C) step- down switching regulator 
D) linear shunt regulator 
A) inverting switching regulator 
B) step- up switching regulator 
C) step- down switching regulator 
D) linear shunt regulator

Question 12

A 7912 regulator has an output of +12 V.

Accepted Answer

A) True 
 B)False

Question 13

Figure 4
-Refer to Figure 4. When the transistor is ON, the

Accepted Answer

A) inductor field is collapsing and D1 is not conducting 
B) inductor field is collapsing and D1 is conducting 
C) inductor field is building and D1 is not conducting 
D) inductor field is building and D1 is conducting 
A) inductor field is collapsing and D1 is not conducting 
B) inductor field is collapsing and D1 is conducting 
C) inductor field is building and D1 is not conducting 
D) inductor field is building and D1 is conducting

Question 14

A regulator output changes from +12.1 V with no load to +11.9 V at the rated current of 2.0 A. The load regulation can be expressed as

Accepted Answer

A) 1.12%/A 
B) 3.36%/A 
C) 1.68%/A 
D) 0.84%/A 
A) 1.12%/A 
B) 3.36%/A 
C) 1.68%/A 
D) 0.84%/A

Question 15

Figure 2
-Refer to Figure 2. The current in the zener is approximately

Accepted Answer

A) 7.5 mA 
B) 19 mA 
C) 26 mA 
D) 16 mA 
A) 7.5 mA 
B) 19 mA 
C) 26 mA 
D) 16 mA

Question 16

Figure 2
-Refer to Figure 2. If the load voltage drops, the voltage across R4 will and the collector current of Q1 will .

Accepted Answer

A) decrease, increase 
B) decrease, decrease 
C) increase, decrease 
D) increase, increase 
A) decrease, increase 
B) decrease, decrease 
C) increase, decrease 
D) increase, increase

Question 17

Figure 4
-Refer to Figure 4. The capacitor is supplying current to the load

Accepted Answer

A) at all times 
B) when the inductor field is collapsing 
C) when the transistor is on 
D) none of the above 
A) at all times 
B) when the inductor field is collapsing 
C) when the transistor is on 
D) none of the above

Question 18

Figure 2
-Refer to Figure 2. The output voltage is approximately

Accepted Answer

A) 11 V 
B) 5.1 V 
C) 6.2 V 
D) 8.5 V 
A) 11 V 
B) 5.1 V 
C) 6.2 V 
D) 8.5 V

Question 19

Figure 1
-Refer to Figure 1. The voltage at the base of Q1 should be

Accepted Answer

A) 11.3 V 
B) 9.3 V 
C) 12.7 V 
D) none of the above 
A) 11.3 V 
B) 9.3 V 
C) 12.7 V 
D) none of the above

Question 20

Figure 2
-Refer to Figure 2. The maximum input voltage is 18 V. The power rating of R1 for worst- case loading is

Accepted Answer

A) 22 W 
B) 30 W 
C) 15 W 
D) 8.2 W 
A) 22 W 
B) 30 W 
C) 15 W 
D) 8.2 W

Ideally, line regulation is 100%.

Of the following types, the most efficient regulator is a(n)

Foldback current limiting differs from normal current limiting in that excessive output current will

Figure 3 Assume ideal components. -Refer to Figure 3. Assume VIN can vary between +15 V and +18 V. To obtain an output of +12 V, the duty cycle must vary between

Switching regulators can step- up, step down, or invert the output.

High temperature can change the output of a regulated power supply.

Figure 6 -Refer to Figure 6. Ignoring IADJ, the output voltage range is approximately

A 12 V power supply has ROUT of 20 m▲ at a maximum current of 1.5 A. The load regulation is

The current sensor for a current limiting circuit is a

The VREF of a series regulator must be equal to VOUT.

Figure 4 -Refer to Figure 4. The type of regulator is a

A 7912 regulator has an output of +12 V.

Figure 4 -Refer to Figure 4. When the transistor is ON, the

A regulator output changes from +12.1 V with no load to +11.9 V at the rated current of 2.0 A. The load regulation can be expressed as

Figure 2 -Refer to Figure 2. The current in the zener is approximately

Figure 2 -Refer to Figure 2. If the load voltage drops, the voltage across R4 will and the collector current of Q1 will .

Figure 4 -Refer to Figure 4. The capacitor is supplying current to the load

Figure 2 -Refer to Figure 2. The output voltage is approximately

Figure 1 -Refer to Figure 1. The voltage at the base of Q1 should be

Figure 2 -Refer to Figure 2. The maximum input voltage is 18 V. The power rating of R1 for worst- case loading is

Introduction to Semiconductors

Diodes and Applications

Special-Purpose Diodes

Bipolar Junction Transistors

Transistor Bias Circuits

BJT Amplifiers

BJT Power Amplifiers

Field-Effect Transistors Fets

Fet Amplifiers and Switching Circuits

Amplifier Frequency Response

Thyristors

The Operational Amplifier

Basic Op-Amp Circuits

Special-Purpose Integrated Circuits

Active Filters

Oscillators

Communication Devices and Methods

Filters

Exam 17: Voltage Regulators

Ideally, line regulation is 100%.

Of the following types, the most efficient regulator is a(n)

Foldback current limiting differs from normal current limiting in that excessive output current will

Figure 3 Assume ideal components. -Refer to Figure 3. Assume VIN can vary between +15 V and +18 V. To obtain an output of +12 V, the duty cycle must vary between

Switching regulators can step- up, step down, or invert the output.

High temperature can change the output of a regulated power supply.

Figure 6 -Refer to Figure 6. Ignoring IADJ, the output voltage range is approximately

A 12 V power supply has ROUT of 20 m▲ at a maximum current of 1.5 A. The load regulation is

The current sensor for a current limiting circuit is a

The VREF of a series regulator must be equal to VOUT.

Figure 4 -Refer to Figure 4. The type of regulator is a

A 7912 regulator has an output of +12 V.

Figure 4 -Refer to Figure 4. When the transistor is ON, the

A regulator output changes from +12.1 V with no load to +11.9 V at the rated current of 2.0 A. The load regulation can be expressed as

Figure 2 -Refer to Figure 2. The current in the zener is approximately

Figure 2 -Refer to Figure 2. If the load voltage drops, the voltage across R4 will and the collector current of Q1 will .

Figure 4 -Refer to Figure 4. The capacitor is supplying current to the load

Figure 2 -Refer to Figure 2. The output voltage is approximately

Figure 1 -Refer to Figure 1. The voltage at the base of Q1 should be

Figure 2 -Refer to Figure 2. The maximum input voltage is 18 V. The power rating of R1 for worst- case loading is

Introduction to Semiconductors

Diodes and Applications

Special-Purpose Diodes

Bipolar Junction Transistors

Transistor Bias Circuits

BJT Amplifiers

BJT Power Amplifiers

Field-Effect Transistors Fets

Fet Amplifiers and Switching Circuits

Amplifier Frequency Response

Thyristors

The Operational Amplifier

Basic Op-Amp Circuits

Special-Purpose Integrated Circuits

Active Filters

Oscillators

Communication Devices and Methods

Filters