Unit 1a Homework Transistor Amplifier Theory

Negative

A forward biased diode is used in stabilization circuits because it has a _________ temperature coefficient. Positive Negative Good Bad

.03

A transistor amplifier circuit has an input change in the signal of 10 mV and an output change in the signal of 300 mV. 3 .03 33 30

a. pass AC signals and isolate the DC voltage between stages.

In the RC coupled amplifier circuit shown, the function of coupling capacitor C2 is to? a. pass AC signals and isolate the DC voltage between stages. b. pass DC voltage and isolate the AC signals between stages c. amplify the signal being coupled to the next stage. d. reject high frequencies and pass low frequencies.

d. Q1 and Q2

In the above RC coupled amplifier, the loss of gain at high frequencies is due to inter-element capacitance of ____. a. C1 b. R1 and R4 c. R3 and R5 d. Q1 and Q2

greater/less

In the common base amplifier, the voltage gain is ____ than one, but the current gain is ____ than one. less / greater greater / less greater / greater less / less

Base, Emitter

In a common collector configuration the input is applied to the _____, and the output is taken from the _____. Base, Emitter Emitter, Collector Base, Collector Collector, Base

Base, collector

In a common emitter configuration, the input is applied to the ____ and the output is taken from the ____. Emitter, Base Base, Collector Emitter, Collector

a. increase

In the CE amplifier, if a positive alternation is applied to the base, collector current will _______> a. increase b. decrease c. remain the same

c. place the collector at AC ground

In the common collector amplifier, the purpose of C2 is to? a. couple the output signal b. develop the output signal c. place the collector at AC ground

Develops the output

In the common collector amplifier, what is the purpose of the resistor R3? Develops the input Develops the output Biasing Network Aids in developing bias

b. degeneration feedback

In the common emitter amplifier, the ohmic value of R3 determines a. amplifier gain b. degeneration feedback c. forward bias for the circuit

a. R4

In the diagram shown, what component provides temperature stabilization, however using it results in emitter degeneration? a. R4 b. R3 c. C2

b. decrease

In the diode stabilization circuit shown, as the temperature increases the diode resistance decreases and the transistor forward bias _____. a. increases b. decreases c. remains the same

b. swamping resistor

Which of the following stabilization circuits uses and "emitter bypass capacitor" to send AC current changes to ground? a. Forward bias diode b. Swamping resistor c. Thermistor

d. swamping

A series emitter resistor is often referred to as a _____ resistor? a. bias b. shunt c. limiter d. swamping

less/greater

A common collector amplifier has a voltage gain ___ than one and a current gain ___ than one. greater/greater greater/less less/greater less/less

b. decrease

As the frequency is applied to a transistor amplifier increases, the transistors inter-element capacitive reactance _____. a. increases b. decreases c. remains the same

b. decrease, decrease

In the circuit shown, as the temperature increases the thermistor's resistance will ____ and the transistor's forward bias will _____. a. increase, increase b. decrease, decrease c. increase, decrease d. decrease, increase

d. decrease; decrease

During the negative input alternation, forward bias will _____ and collector current will ______. a. increase; increase b. increase; decrease c. decrease; increase d. decrease; decrease

a. Direct b. RC c. LC d. Transformer

Select all that apply: List the types of coupling circuits used to connect one amplifier to another. a. Direct b. RC c. LC d. Transformer

a. Easier to Tune b. Impedance matching c. Provides isolation to prevent feedback

Select all that apply: The advantages of using transformer coupling a. Easier to Tune b. Impedance matching c. Provides isolation to prevent feedback

b. Transistors c. Transformers d. Inductors

Select all that apply: The components that cause high frequency gain loss in cascade amplifiers. a. Capacitors b. Transistors c. Transformers d. Inductors

a. capacitors c. transformers d. inductors

Select all that apply: Three types of components that cause low frequency gain loss in a cascade amplifier. a. capacitors b. transistors c. transformers d. inductors

b. Q1, Q2, Q3, Q4, L1, T1

Select all that apply: components that cause high frequency gain loss in the cascade amplifier circuit. a. C1, C3, C5, C9, T1, L1 b. Q1, Q2, Q3, Q4, L1, T1 c. R1, R3, R5, L1, T1

b. Temperature and Resistance are inversely proportional to each other.

Select the best option that explains negative temperature coefficient as it relates to a transistor. a. Temperature and resistance are directly proportional to each other. b. Temperature and Resistance are inversely proportional to each other.

a. C1, C3, C5, T1, C9, L1

Select the components that cause low frequency gain loss in the cascade amplifier circuit. a. C1, C3, C5, T1, C9, L1 b. C2, C4, C6, C7, C10, L1, T1 c. R1, R5, L1, T1 d. Q1, Q2, Q3, Q4, Q5

decrease

The "negative temperature coefficient" of a thermistor means that as temperature increases resistance ___________. remains the same decreases increases

d. the amount of forward bias

The amplifiers class of operation is determined by? a. fidelity b. efficiency c. the output waveform d. the amount of forward bias

b. 360 degrees

The class A amplifier conducts for ____ degrees of the input cycle. a. 180° b. 360° c. less than 180° d. more than 180°, but less than 360°

a. 180 degrees

The class B amplifier conducts for _____ of the input cylce. a. 180° b. 360° c. less than 180° d. more than 180° but less than 360°

180 degrees

The class C amplifier is biased to allow Ic to flow for less than [x] degrees of the input cycle. 180° 360° less than 180°

Emitter, collector

The common base amplifier has the input applied to the _____ and the output take from the _____. Base, Collector Collector, Emitter Emitter, Collector

b. R2

The common emitter amplifier forward bias can be increased by increasing the value of? a. R1 b. R2 c. R3 d. C1

Q

The operating point on the load line can also be called the [x] point. T S Q P

b. amplitude

The output sine wave being chopped off at the top and bottom is an example of ____ distortion. a. phase b. amplitude c. frequency

180 degrees out of phase

The phase relationship of the output signal to the input signal voltage in a (CE) amplifier is 90 degrees out of phase 45 degrees out of phase 180 degrees out of phase 270 degrees out of phase

a. develop the input signal

The purpose of R4 is to ? a. develop the input signal b. develop the output signal c. keep the base of Q1 at AC ground

b. out of

The signal on the base of Q1 is ____ phase with the collector signal of Q2. a. in b. out of

c. Collector

The transistor amplifier configuration below is a common _____. a. base b. Emitter c. Collector

a. base

The transistor amplifier configuration shown is a common ____. a. base b. emitter c. collector

c. common element

To determine a transistor amplifier's configuration, identify the elements to which the input and output are connected. The remaining element is called the? a. base b. battery c. common element d. common collector

True

True or Fale. The purpose of R1 and R2 in the common emitter amplifier serve as the bias resistors for Q1.

True

True or False. A disadvantage of emitter degeneration in a common collector amplifier is reducing of the voltage gain.

True

True or False. An inductor replaces the collector load resistor in LC coupled amplifiers?

True

True or False. In the LC coupled amplifier, transistor inter-element capacitance and inductor inter-winding capacitance cause high frequency gain loss.

True

True or False. R1 and R2, function in the common base amplifier is the biasing network for Q1.

True

True or False. Stray capacitance exist between circuit components and wiring.

True

True or False. The component that places the base of the common base amplifier to AC ground is C1.

True

True or False. The disadvantage of using LC coupled amplifiers is high frequency use only.

True

True or False. The purpose of C2 in the common emitter amplifier is to serve as the output coupling capacitor.

True

True or False. The purpose of the common emitter amplifier is provide current and voltage amplification resulting in a power increase.

True

True or false. Three types of transistor amplifier configurations are Common Emitter, Common Collector, and Common Base.

a. Direct

What type of coupling passes both DC voltages and AC signals? a. Direct b. RC c. LC d. Transformer

a. heat sink b. cooling fans

What type of device is used to dissipate heat from a transistor? a. heat sink b. cooling fans c. tank circuit d. transformer

d. voltage, current, and power gain

What type of gain does the common emitter amplifier provide? a. current gain only b. voltage gain only c. voltage and bias gain d. voltage, current, and power gain

a. common base

Which amplifier circuit has a voltage gain greater than one and a current gain less than one? a. common base b. common emitter c. common collector

b. R3

What allows the output to be developed across Q1? a. R4 b. R3 c. C2 d. C3

e. All of the above

What are the classes of operation for amplifiers? a. A b. AB c. B d. C e. All of the above.

R3

What component allows the output signal to be developed across the transistor? R3 R1 R2 C1

b. In-phase

What is the phase relationship between input and output voltage waveforms in a common collector amplifier? a. Out of phase b. In-phase

0 degrees

What is the phase relationship between the input and output voltage waveforms? 90° 0° 180° 270°

c. biasing network for Q2

What is the purpose of R3 and R4 in the transformer coupled amplifier shown? a. Load resistors b. series current limiting resistors c. biasing network for Q2 d. biasing network for Q1

1000

What is the voltage gain of the cascade amplifier shown below? 10 10,000 100 1,000

a. LC

What type of coupling is used to couple the signal from Q3 and Q4 in the cascade amplifier circuit? a. LC b. RC c. Direct d. Transformer