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1.
Amplifier Basics

2.
Class A Amplifier Design

3.
Multistage Amps & NFB

4.
Amplifier Circuits

5.
Power Amplifiers

6. Operational Amplifiers

6.0
Introduction

6.1
Op amp Inputs

6.2
Comparators

6.3
Voltage Amplifiers

6.4
Op amp Characteristics

6.5
Op amp Packages

6.6
Op amp Circuits

6.7 Op amps Quiz

Module 6.7

Op Amps Quiz

Try our quiz, based on the information you can find in Amplifiers Module 6
Submit your answers and see how many you get right. If you get any answers
wrong. Just follow the hints to find the right answer and learn about
Amplifiers as you go.

1.
Which of the following properties should an ideal op amp have?

a) Infinitely wide
bandwidth, infinitely high output impedance and perfect
linearity.

b) High DC gain, low
input reactance and perfect linearity.

c) Infinitely high
input impedance, perfect linearity and zero noise.

d) Infinitely high
gain, perfect linearity and zero input impedance.

2.
In
Fig. 6.7.1, Tr2 is conducting due to a fixed voltage at input ‘b’. If input ‘a’
becomes more positive than ‘b’, what will be the resulting change at outputs C
& D?

a) The voltage at
output C will fall and output D will rise by an equal amount.

b) The voltage at
output C will rise and output D will fall by an equal amount.

c) The voltage at
output C will rise and output D will be unaltered.

d) The voltage at
output C will fall and output D will be unaltered.

3.
On op amps that use an offset null control, this is adjusted to give
which of the following conditions:

a) To make both
inputs equal zero volts.

b) To make both
inputs the same voltage.

c) To balance the
positive and negative supplies.

d) To make the output
voltage equal zero volts.

4.
Calculate the approximate voltage gain of the amplifier in Fig 6.7.2

a) 5.7

b) 14.3

c) 6.7

d)
17.6

5.
Refer to Fig 6.7.2 : If R2 is changed to 82K and +0.7 V DC (w.r.t.
0V) is applied to the circuit input, what will be the approximate output voltage
and its polarity w.r.t 0V?

a)
+3.99V

b)
−3.99V

c) −4.8V

d)
+5.5V

6.
What does the "Large Signal Voltage Gain" of an op amp refer
to?

a) The open loop gain
at DC (0Hz), measured in dB

b) The Gain that
produces a peak to peak signal output equal to the difference between the
positive and negative supply voltages measured in dB.

c) The voltage ratio
of the peak to peak output signal to a 1 volt peak to peak input signal,
measured in mV/V

d) The open loop gain
that produces the largest undistorted output signal measured in
V/mV

7.
What characteristic of an op amp is the formula 2πƒ Vpk used to
calculate?

a) The gain bandwidth
product.

b) The slew
rate.

c) The power
bandwidth.

d) The open loop
voltage gain.

8.
Refer to Fig 6.7.3, which shows the DC input to pin 3, the low
frequency signal to pin 2 and the output signal at pin 6 of a 741 op amp. What
purpose is the op amp being used for?

a) A buffer
amplifier.

b) A
differentiator.

c) A
comparator.

d) An
integrator.

9.
Fig. 6.7.4 shows the package outline of a TLC271 programmable op amp.
If the two ends of a preset potentiometer are connected across pins 1 and 5, to
which pin should the potentiometer wiper be connected to?

a) 2

b) 3

c) 4

d) 8

10.
Simple D to A conversion can be achieved using a weighted series of
resistors and a single op amp configured in which of the following modes?

a) Voltage
follower.

b)
Integrator

c) Summing
amplifier.

d) Differential
amplifier

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© 2007− 2016 Eric Coates MA BSc. (Hons) All
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