FC ATT Week 5 Test

Transistor amplifiers require what type of signal to function?

DC bias and AC input signals

What changes are necessary for amplification to occur?

Small change in base voltage, large change in collector current

What amplifier has the best fidelity?

class A

What amplifier has the best efficiency?

class C

When an input is applied across the emitter to base PN Junction, what is the relative resistance?

low

When an input is applied across the collector to base PN Junction, What is the relative resistance?

high, because it is reverse biased

The purpose of a transistor is to:

control signals

A cutoff transistor acts like it's:

open

What type of amplifier configuration has the input applied to the emitter and the output taken from the collector?

common base

To determine the faulty component in a diode limiter or clamper; use ______________

resistance measurements

What happens in a transistor when the saturation point is reached?

Ic stops increasing

What happens in a transistor when the base voltage reverse biases the emitter to base PN junction?

cutoff occurs

_______ is the ratio of Ic/Ie

Alpha

The capacitor in a clamper circuit has a fast charge path when the diode is ___________

forward biased

In an operating PNP transistor, which PN junction is forward biased and which PN junction is reversed biased?

forward Emitter Base, reverse Collector Base

In a NPN transistor, the base DC bias voltage must be:

positive compared to the emitter

In a PNP transistor, the base DC bias voltage must be:

negative compared to the emitter

In an operating NPN transistor, which PN junction is forward biased and which PN junction is reverse biased?

forward EB, reverse CB

In a ______________ amplifier, when the base voltage increases~ the emitter current increases.

common emitter

In a _____________ amplifier, when emitter current increases~ the collector current increases.

common emitter

In a _____________ amplifier, when the base voltage increases~ the emitter current increases.

common collector

In a _____________ amplifier, when base voltage decreases~ output voltage decreases.

common collector

In a _____________ amplifier, when the emitter voltage increases~ the emitter to base forward bias decreases.

common base

In a ____________ amplifier, when the emitter voltage increases~ the emitter current decreases.

common base

What type of coupling has the least effect on the collector AC signal for high frequency inputs?

LC coupling

The ____________ amplifier output is controlled by a small input signal.

common emitter

What type of output signal is produced by a class C common base amplifier?

In phase and Amplified

In a RC coupled transistor amplifier, what is the result of a low frequency input signal? Stage gains ______, total gain ______, output signal _________

good, low, undistorted

In a RC coupled transistor amplifier, what is the result of a high VPP input signal? Stage gains ______, total gain ______, output signal _________

low, low, distorted

What type of transistors are used in a common collector push-pull amplifier?

one NPN and one PNP

In RC coupled amplifiers, normal operation is verified by comparing measured and calculated:

total current voltage gain

The transistor bias _______________ are made after the faulty stage has been identified

voltage measurements

The common emitter output phase is _____ degrees out of phase

180

What class of amplifiers are biased so collector current is zero for half of the input signal?

class B

Transistors amplify by controlling a _______

large signal with a small signal

Which amplifier configuration has high input resistance and low output resistance?

common collector

What is the relative resistance of a reverse biased collector to base PN junction?

high

Which amplifier configuration has low input resistance and high output resistance?

common base

What type of amplifier configuration has the input applied to the base and the output taken from the emitter?

common collector

To determine if a diode limiter or clamper circuit is operating normally, you use _______

waveform measurements

Beta - current gain

Ic/Ib (collector current / base current