Question 1

An op-amp will not work if

Accepted Answer

A)  the supply voltages are less than ±5 V. 
B)  the input offset voltage is less than 100 mV. 
C)  either the inverting or noninverting input is not provided with an external current path. 
D)  the input offset current is less than 1 mA. 
A)  the supply voltages are less than ±5 V. 
B)  the input offset voltage is less than 100 mV. 
C)  either the inverting or noninverting input is not provided with an external current path. 
D)  the input offset current is less than 1 mA. C

Question 2

The inverting and noninverting inputs to an op-amp are connected to an)

Accepted Answer

A)  inverting amplifier. 
B)  noninverting amplifier. 
C)  differential amplifier. 
D)  open-loop amplifier. 
A)  inverting amplifier. 
B)  noninverting amplifier. 
C)  differential amplifier. 
D)  open-loop amplifier. C

Question 3

The total phase shift around a positive feedback loop is

Accepted Answer

A)  360° or 0°). 
B)  180°. 
C)  90°. 
D)  45°. 
A)  360° or 0°). 
B)  180°. 
C)  90°. 
D)  45°. A

Question 4

An op-amp circuit has ±15 V supply voltages and a voltage gain of 20. The noninverting voltage V2) is 0.3 V and the inverting voltage V1) is 0.35 V. What is the output voltage from the device?

Accepted Answer

A)  +1 V 
B)  +6 V 
C)  -1 V 
D)  -7 V 
A)  +1 V 
B)  +6 V 
C)  -1 V 
D)  -7 V

Question 5

The total phase shift around a negative feedback loop is

Accepted Answer

A)  360° or 0°). 
B)  180°. 
C)  90°. 
D)  45°. 
A)  360° or 0°). 
B)  180°. 
C)  90°. 
D)  45°.

Question 6

An op-amp has a 3 kΩ load and ±10 V supply voltages. What is the maximum possible peak-to peak output voltage for the circuit?

Accepted Answer

A)  Approximately 18 V 
B)  Approximately 16 V 
C)  Approximately 20 V 
D)  None of the above. 
A)  Approximately 18 V 
B)  Approximately 16 V 
C)  Approximately 20 V 
D)  None of the above.

Question 7

Negative feedback the output impedance of a noninverting amplifier.

Accepted Answer

A)  increases 
B)  decreases 
C)  does not affect 
A)  increases 
B)  decreases 
C)  does not affect

Question 8

-The value of ACL for the circuit in Figure  is

Accepted Answer

A)  50 k. 
B)  200. 
C)  50. 
D)  51. 
A)  50 k. 
B)  200. 
C)  50. 
D)  51.

Question 9

-The op-amp in Figure has an output impedance of 100 Ω. The output impedance of the circuit is slightly less than

Accepted Answer

A)  100 Ω. 
B)  100 kΩ. 
C)  100.1 kΩ. 
D)  50 Ω. 
A)  100 Ω. 
B)  100 kΩ. 
C)  100.1 kΩ. 
D)  50 Ω.

Question 10

The voltage follower typically has a value of CMRR = 1.

Accepted Answer

A) True 
 B)False

Question 11

A negative feedback amplifier has values of αv = 0.114 and Av = 244. What is the value of Avf for the circuit?

Accepted Answer

A)  8.47 
B)  2140 
C)  35.1 
D)  6.75 
A)  8.47 
B)  2140 
C)  35.1 
D)  6.75

Question 12

Solid-state devices that contain more than one active and/or passive component are called

Accepted Answer

A)  discrete devices. 
B)  integrated circuits. 
C)  multiple-component circuits. 
D)  op-amps. 
A)  discrete devices. 
B)  integrated circuits. 
C)  multiple-component circuits. 
D)  op-amps.

Question 13

Op-amps are available in

Accepted Answer

A)  dual in-line packages DIPs). 
B)  surface-mount packages SMPs) 
C)  type TO-5 metal cans. 
D)  all of these packages. 
A)  dual in-line packages DIPs). 
B)  surface-mount packages SMPs) 
C)  type TO-5 metal cans. 
D)  all of these packages.

Question 14

Why is the CMRR of an inverting amplifier always lower than that of its op-amp?

Accepted Answer

A)  The common-mode gain of an op-amp increases when it is used in an inverting amplifier. 
B)  The value of differential gain for an inverting amplifier is lower than that of its op-amp. 
C)  Slew-rate limiting decreases the common-mode gain of the op-amp. 
D)  Because of the lower input impedance of the inverting amplifier. 
A)  The common-mode gain of an op-amp increases when it is used in an inverting amplifier. 
B)  The value of differential gain for an inverting amplifier is lower than that of its op-amp. 
C)  Slew-rate limiting decreases the common-mode gain of the op-amp. 
D)  Because of the lower input impedance of the inverting amplifier.

Question 15

Negative feedback the input impedance of a noninverting amplifier.

Accepted Answer

A)  increases 
B)  decreases 
C)  does not affect 
A)  increases 
B)  decreases 
C)  does not affect

Question 16

-The circuit in Figure has an output that is approximately

Accepted Answer

A)  10 Vpp. 
B)  11 Vpp. 
C)  1 Vpp. 
D)  Cannot be determined without knowing the value of AOL. 
A)  10 Vpp. 
B)  11 Vpp. 
C)  1 Vpp. 
D)  Cannot be determined without knowing the value of AOL.

Question 17

The feedback resistor Rf) in Figure opens. What is the peak-to-peak output from the circuit?

Accepted Answer

A)  11 Vpp clipped) 
B)  20 Vpp clipped) 
C)  18 Vpp clipped) 
D)  18 Vpp not clipped) 
A)  11 Vpp clipped) 
B)  20 Vpp clipped) 
C)  18 Vpp clipped) 
D)  18 Vpp not clipped)

Question 18

A negative feedback amplifier has values of Vout = 6 Vpp and Vf = 630 mVpp. What is the attenuation factor of the circuit?

Accepted Answer

A)  4.28 
B)  0.0641 
C)  0.105 
D)  9.52 
A)  4.28 
B)  0.0641 
C)  0.105 
D)  9.52

Question 19

When a given op-amp has 10 V common-mode inputs, the output of the device is 10 mV. When this same device has a 2 mV differential input, the output of the device is 10 V. What is the CMRR of the device?

Accepted Answer

A)  5:1 
B)  5000:1 
C)  1000:1 
D)  5,000,000:1 
A)  5:1 
B)  5000:1 
C)  1000:1 
D)  5,000,000:1

Question 20

-The common-mode gain of the op-amp in Figure  is 0.002. What is the CMRR of the amplifier?

Accepted Answer

A)  25,000:1 
B)  0.002:1 
C)  100:1 
D)  Cannot be determined from the information given. 
A)  25,000:1 
B)  0.002:1 
C)  100:1 
D)  Cannot be determined from the information given.

Exam 15: Operational Amplifiers

An op-amp will not work if

The inverting and noninverting inputs to an op-amp are connected to an)

The total phase shift around a positive feedback loop is

An op-amp circuit has ±15 V supply voltages and a voltage gain of 20. The noninverting voltage V2) is 0.3 V and the inverting voltage V1) is 0.35 V. What is the output voltage from the device?

The total phase shift around a negative feedback loop is

An op-amp has a 3 kΩ load and ±10 V supply voltages. What is the maximum possible peak-to peak output voltage for the circuit?

Negative feedback the output impedance of a noninverting amplifier.

-The value of ACL for the circuit in Figure is

-The op-amp in Figure has an output impedance of 100 Ω. The output impedance of the circuit is slightly less than

The voltage follower typically has a value of CMRR = 1.

A negative feedback amplifier has values of αv = 0.114 and Av = 244. What is the value of Avf for the circuit?

Solid-state devices that contain more than one active and/or passive component are called

Op-amps are available in

Why is the CMRR of an inverting amplifier always lower than that of its op-amp?

Negative feedback the input impedance of a noninverting amplifier.

-The circuit in Figure has an output that is approximately

The feedback resistor Rf) in Figure opens. What is the peak-to-peak output from the circuit?

A negative feedback amplifier has values of Vout = 6 Vpp and Vf = 630 mVpp. What is the attenuation factor of the circuit?

When a given op-amp has 10 V common-mode inputs, the output of the device is 10 mV. When this same device has a 2 mV differential input, the output of the device is 10 V. What is the CMRR of the device?

-The common-mode gain of the op-amp in Figure is 0.002. What is the CMRR of the amplifier?

Fundamental Solid-State Principles

Diodes

Common Diode Applications: Basic Power Supply Circuits

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

Additional Op-Amp Applications

Tuned Amplifiers

Oscillators

Solid-State Switching Circuits

Thyristors and Optoelectronics Devices

Discrete and Integrated Voltage Regulators

Filters