Deck 9: Multistage,CC,and CB Amplifiers

Question 1

One of the major differences between the CB amplifier and other amplifier configurations is its

A) low input impedance.
B) low output impedance.
C) high input impedance.
D) input and output phase difference.

Answer 1

A

Question 2

Used with a zener diode,an emitter follower can produce regulated output voltages with much larger currents.

Answer 2

True

Question 3

A common-base circuit can be used to couple a

A) high impedance source to a low impedance load.
B) low impedance source to a high impedance load.
C) high impedance source to a high impedance load.
D) low impedance source to a low impedance load.

Answer 3

B

Question 4

A zener follower provides the regulation of a zener diode with the increased current-handling capability of an emitter follower.

Question 5

A Darlington connection is a connection of two transistors whose overall current gain equals the sum of the individual gains.

Question 6

The emitter follower is also called a common-collector amplifier.

Question 7

It is very difficult to get a small output impedance with a common-collector amplifier.

Question 8

The CB amplifier is most often used

A) as an audio amplifier.
B) in low frequency applications.
C) in high frequency applications.
D) in high fidelity audio applications.

Question 9

A complementary Darlington is a connection of npn and pnp transistors.

Question 10

A zener follower is a circuit that combines a zener regulator and a common emitter.

Question 11

An emitter follower can act as a buffer between the high output impedance of a common-emitter amplifier and a low resistance load.

Question 12

The output voltage of a common-base amplifier is out of phase with its input.

Question 13

One of the advantages of an emitter follower is its high output impedance.

Question 14

The common-base amplifier is also called a grounded-base amplifier.

Question 15

In a common-collector amplifier,the emitter is always connected to ground.

Question 16

The voltage gain of a common-collector amplifier is ________.

A) infinite
B) 1
C) 10
D) 100

Question 17

Small load resistances that would overload a CE amplifier can be used with an emitter follower because an emitter follower

A) steps up impedance.
B) amplifies high frequencies better.
C) has a higher voltage gain.
D) cannot amplify current.

Question 18

The emitter-follower amplifier has a

A) low input impedance and low distortion.
B) high input impedance and high distortion.
C) high input impedance and low distortion.
D) low input impedance and high distortion.

Question 19

With a common-collector amplifier,the input signal is

A) coupled to the base and the output signal is taken from the emitter.
B) coupled to the base and the output signal is taken from the collector.
C) coupled to the emitter and the output signal is taken from the collector.
D) coupled to the emitter and the output signal is taken from the base.

Question 20

The emitter follower can be considered a

A) voltage amplifier.
B) power amplifier.
C) a current attenuator.
D) a power supply.

Question 21

The amplifier configuration in which the input signal drives the emitter and the output signal is taken from the collector is the

A) common collector.
B) common emitter.
C) common base.
D) emitter follower.

Question 22

The zener follower provides the regulation of a zener diode with the increased current-handling capability of a

A) common-collector circuit.
B) common-emitter circuit.
C) common-base circuit.
D) common-follower circuit.

Question 23

When an emitter follower is configured between a high output impedance and a low resistance load,it is referred to as

A) an attenuator.
B) a clamper.
C) a constant current source.
D) a buffer.

Question 24

A circuit that combines a zener regulator and an emitter follower is referred to as

A) an emitter regulator.
B) a follower regulator.
C) a zener follower.
D) a zener diode.

Question 25

The collector voltage for the circuit shown in Figure 9-6 (a)is

A) dc only.
B) ac only.
C) ac riding on dc.
D) 0 V.

Question 26

In conjunction with a zener diode,the emitter follower can

A) provide amplified full-wave rectification.
B) provide amplified and filtered dc voltages.
C) produce regulated voltages with large output currents.
D) produce unregulated voltages.

Question 27

A Darlington connection comprised of npn and pnp transistors is called a

A) stationary Darlington.
B) Duo-Darlington.
C) supplementary Darlington.
D) complementary Darlington.

Question 28

With the amplifier configuration shown in Figure 9-6 (a)

A) ac output is 90° out of phase with the input.
B) ac output is 180° out of phase with the input.
C) ac output is 270° out of phase with the input.
D) ac output is in phase with the input.

Question 29

What is the emitter voltage for the circuit shown in Figure 9-8?

A) 10 V
B) 5 V
C) 1 V
D) 4.3 V

Question 30

The reason a common-collector amplifier is called an emitter follower is because

A) the output voltage follows the input voltage.
B) the output voltage is taken from the collector.
C) the emitter is grounded.
D) the output voltage is out of phase with the input.

Question 31

What is the base voltage for the circuit shown in Figure 9-8?

A) 10 V
B) 5 V
C) 1 V
D) 4.3 V

Question 32

What amplifier configuration is shown in Figure 9-6 (a)?

A) common emitter
B) common collector
C) common base.
D) base follower

Question 33

In the circuit shown in Figure 9-8,what is the purpose of the capacitor connected to the emitter?

A) filter
B) bypass
C) coupling
D) to block ac

Question 34

Semiconductor manufacturers make Darlington pairs inside a single case.What is this device known as?

A) Semiconductor single case
B) Darlington transistor
C) power transistor
D) regulator transistor

Question 35

In any amplifier,maximum power transfer occurs when the

A) load impedance is much higher than the source impedance.
B) load impedance is much lower than the source impedance.
C) load impedance is made equal to the source impedance.
D) load impedance is infinite and source impedance is zero.

Question 36

An advantage of a zener follower is

A) low output impedance.
B) high output impedance.
C) large zener diode.
D) low cost.

Question 37

The low impedance of a speaker can be matched to the output impedance of

A) a common collector to deliver maximum power.
B) a common base to deliver maximum power.
C) a common emitter to deliver maximum power.
D) a coupling capacitor.

Question 38

If each transistor in a Darlington pair has a gain of 100,what is the overall current gain?

A) 100
B) 200
C) 1000
D) 10,000

Question 39

A connection of two transistors whose overall current gain equals the product of the individual current gains is called a

A) complementing connection.
B) cascade connection.
C) Darlington connection.
D) Quiescent connection.

Question 40

A Darlington connection typically has a

A) very high input impedance and can produce large output currents.
B) very low input impedance and can produce large output currents.
C) very high input impedance and can produce only small output currents.
D) very low input impedance and can produce only small output currents.

Question 41

A multistage amplifier using two common-emitter amplifiers will provide a total phase inversion of ________.

A) 360°
B) 270°
C) 180°
D) 90°

Question 42

It is very difficult to get a small output impedance with a

A) common-collector amplifier.
B) common-emitter amplifier.
C) common-base amplifier.
D) emitter-follower amplifier.

Question 43

How is the total voltage gain of a multistage amplifier calculated?

A) sum of individual gains
B) difference of individual gains
C) product of individual gains
D) it is the gain of one amplifier

Question 44

A multistage amplifier can be created by cascading two or more filter circuits.

Question 45

What is the circuit shown in Figure 9-16 (c)?

A) two cascaded common-emitter amplifiers
B) a small-signal amplifier
C) a supplementary Darlington
D) a complementary Darlington

Question 46

What is a multistage amplifier?

A) a single stage amplifier
B) a single stage attenuator
C) two or more attenuators cascaded
D) two or more amplifiers cascaded

Question 47

If the output voltage across R_L increases in the circuit shown in Figure 9-15,what will the voltage at the base of Q₂ do?

A) increase
B) decrease
C) remain the same
D) drops to zero

Question 48

Voltage gain can be increased by using a multistage amplifier.

Question 49

If two or more amplifiers are connected to form a multistage amplifier

A) gain remains constant.
B) gain increases.
C) gain is reduced.
D) more attenuation results.

Question 50

What is the circuit shown in Figure 9-20?

A) full-wave rectifier
B) zener follower
C) two-transistor amplifier
D) two-transistor regulator