Question 1

Active limiting and clamping employs an amplifier circuit.

Accepted Answer

A) True 
 B)False

Question 2

A voltage-to-current converter has a JFET in the feedback loop.

Accepted Answer

A) True 
 B)False

Question 3

A basic instrumentation amplifier has three op-amps.

Accepted Answer

A) True 
 B)False

Question 4

-Refer to Figure 20-1 (b). If   the current thru the load   Figure 20-2 would be:

Accepted Answer

A) 227 μA. 
B) 227 mA. 
C) 22.7 mA. 
D) 22.7 μA. 
A) 227 μA. 
B) 227 mA. 
C) 22.7 mA. 
D) 22.7 μA.

Question 5

One of the key characteristics of an instrumentation amplifier is its low input impedance.

Accepted Answer

A) True 
 B)False

Question 6

The diode clamper circuit output is an ac signal that has a dc reference point of the peak voltage of
the ac.

Accepted Answer

A) True 
 B)False

Question 7

A peak detectorʹs output continually changes based on the input.

Accepted Answer

A) True 
 B)False

Question 8

The primary function of the oscillator in an isolation amplifier is to:

Accepted Answer

A) convert dc to low frequency ac. 
B) rectify high frequency ac to dc. 
C) convert dc to high frequency ac. 
D) produce dual polarity dc voltages for the input to the demodulator. 
A) convert dc to low frequency ac. 
B) rectify high frequency ac to dc. 
C) convert dc to high frequency ac. 
D) produce dual polarity dc voltages for the input to the demodulator.

Question 9

A voltage limiter that limits both positive and negative peaks uses two zener diodes connected
anode to cathode.

Accepted Answer

A) True 
 B)False

Question 10

An active clamping circuit negates the opposite polarity 0.7 V peak by using two diodes in series.

Accepted Answer

A) True 
 B)False

Question 11

-Refer to Figure 20-2. Which of these circuits contains an OTA?

Accepted Answer

A) (a) 
B) (b) 
C) (c) 
D) (d) 
A) (a) 
B) (b) 
C) (c) 
D) (d)

Question 12

An instrumentation amp with one open input:

Accepted Answer

A) may work correctly in a low noise environment. 
B) will not work at all. 
C) will allow common-mode noise to be present on the output. 
D) both A and C 
A) may work correctly in a low noise environment. 
B) will not work at all. 
C) will allow common-mode noise to be present on the output. 
D) both A and C

Question 13

If an operational transconductance amplifier (OTA) is used as a nonlinear mixer and an audio signal is mixed with an RF signal, the output will be a(n) ________ signal.

Accepted Answer

A) amplitude modulated (AM) 
B) square wave 
C) triangular wave 
D) frequency modulated (FM) 
A) amplitude modulated (AM) 
B) square wave 
C) triangular wave 
D) frequency modulated (FM)

Question 14

-Refer to Figure 20-1. Which of these circuits is known as an instrumentation amplifier?

Accepted Answer

A) (a) 
B) (b) 
C) (c) 
D) (d) 
A) (a) 
B) (b) 
C) (c) 
D) (d)

Question 15

Two zener diodes are used in a limiter circuit to:

Accepted Answer

A) better regulate a power supply. 
B) limit both positive and negative peaks. 
C) reduce interelectrode capacitance at high frequencies. 
D) none of the above 
A) better regulate a power supply. 
B) limit both positive and negative peaks. 
C) reduce interelectrode capacitance at high frequencies. 
D) none of the above

Question 16

An active limiter includes an op-amp which:

Accepted Answer

A) works better under loaded conditions. 
B) keeps the circuit from oscillating. 
C) increases the output voltage. 
D) allows a reference level to be set. 
A) works better under loaded conditions. 
B) keeps the circuit from oscillating. 
C) increases the output voltage. 
D) allows a reference level to be set.

Question 17

A basic isolation amplifier has two electrically isolated sections.

Accepted Answer

A) True 
 B)False

Question 18

-Refer to Figure 20-1 (a). If   the   would be:

Accepted Answer

A) 551. 
B) 560. 
C) 56.1. 
D) 5.61. 
A) 551. 
B) 560. 
C) 56.1. 
D) 5.61.

Question 19

A voltage-to-current converter works by controlling current proportional to the input voltage.

Accepted Answer

A) True 
 B)False

Question 20

A voltage-to-current converter is used in applications where itʹs necessary to have an output load current that is controlled by ________.

Accepted Answer

A) input voltage 
B) input frequency 
C) output resistance 
D) input resistance 
A) input voltage 
B) input frequency 
C) output resistance 
D) input resistance

Exam 20: Time Response of Reactive Circuits

Active limiting and clamping employs an amplifier circuit.

A voltage-to-current converter has a JFET in the feedback loop.

A basic instrumentation amplifier has three op-amps.

-Refer to Figure 20-1 (b). If the current thru the load Figure 20-2 would be:

One of the key characteristics of an instrumentation amplifier is its low input impedance.

The diode clamper circuit output is an ac signal that has a dc reference point of the peak voltage of the ac.

A peak detectorʹs output continually changes based on the input.

The primary function of the oscillator in an isolation amplifier is to:

A voltage limiter that limits both positive and negative peaks uses two zener diodes connected anode to cathode.

An active clamping circuit negates the opposite polarity 0.7 V peak by using two diodes in series.

-Refer to Figure 20-2. Which of these circuits contains an OTA?

An instrumentation amp with one open input:

If an operational transconductance amplifier (OTA) is used as a nonlinear mixer and an audio signal is mixed with an RF signal, the output will be a(n) ________ signal.

-Refer to Figure 20-1. Which of these circuits is known as an instrumentation amplifier?

Two zener diodes are used in a limiter circuit to:

An active limiter includes an op-amp which:

A basic isolation amplifier has two electrically isolated sections.

-Refer to Figure 20-1 (a). If the would be:

A voltage-to-current converter works by controlling current proportional to the input voltage.

A voltage-to-current converter is used in applications where itʹs necessary to have an output load current that is controlled by ________.

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

Magnetism and Electromagnetism

Introduction to Alternating Current and Voltage

Capacitors

Inductors

Transformers

RC Circuits

RL Circuits

RlC Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Three-Phase Systems in Power Applications

Filters