Question 1

____ occurs when a small current through the base and emitter is acted upon by the transistor.&#10;A) Inversion&#10;B) Rectification&#10;C) Synthesis&#10;D) Amplification

Accepted Answer

Amplification occurs when a small current through the base and emitter of a transistor is used to control a larger current flowing between the collector and emitter, effectively increasing the power of the signal.

Question 2

A transistor is biased by furnishing a DC current to the base of the transistor and adjusting the current to a point that the transistor is turned half on.

Accepted Answer

Biasing a transistor involves setting up a steady DC current through the base to establish a fixed level of current flow and operating point, so that the transistor can amplify signals properly. Adjusting the base current to a point where the transistor is "half on" refers to setting it in the active region, where it can properly function as an amplifier.

Question 3

If a transistor is a linear device, a decrease of base-emitter current will produce a proportional increase in collector-emitter current.

Accepted Answer

A transistor is not a linear device; its operation is based on the exponential relationship between the base-emitter voltage and the collector current, not a linear relationship. Therefore, changes in base-emitter current do not result in proportional changes in collector-emitter current.

Question 4

____ means to present or precondition.&#10;A) Basis&#10;B) Bias&#10;C) Floor&#10;D) Ground

Accepted Answer

Bias means to influence or prejudice for or against something or someone, often in a way that is considered to be unfair. This can be seen as a form of preconditioning.

Question 5

In order for the transistor to be able to reproduce the base signal, it must not be biased.

Accepted Answer

For a transistor to properly reproduce the base signal, it must be biased into its active region, where it can amplify the input signal effectively.

Question 6

A good example of how a simple transistor amplifier may be used in an industrial application is when a relay is to be controlled by a light beam.

Accepted Answer

A simple transistor amplifier can amplify the small electrical signal generated by a light sensor (like a photodiode) when it detects a light beam, to a level sufficient to activate a relay. This is a common method for implementing light-based control systems in industrial applications.

Question 7

A ____ is used to sense the presence of a light beam.&#10;A) photodiode&#10;B) transistor&#10;C) capacitor&#10;D) transducer

Accepted Answer

A photodiode is specifically designed to detect light and convert it into an electrical signal, making it the correct choice for sensing the presence of a light beam.

Question 8

As the base-emitter current begins to rise in the positive direction, the impedance of the collector-emitter of the transistor decreases and current begins to flow through the load resistor and transistor.

Accepted Answer

As the base-emitter current in a transistor increases, it allows more current to flow from the collector to the emitter, effectively decreasing the impedance (or resistance) between these two terminals. This results in an increase in current flow through the load resistor connected in series with the collector, following the principle of transistor operation in active mode.

Question 9

The output waveform of the transistor is ____ the waveform applied to the base.&#10;A) reverse&#10;B) at right-angles to&#10;C) inverse&#10;D) reversed flow of

Accepted Answer

The output waveform of a transistor is typically the inverse of the waveform applied to the base due to the phase inversion property of common-emitter amplifier configurations.

Question 10

When a transistor is to be used as an amplifier, it must be ____.&#10;A) biased&#10;B) filtered&#10;C) inverted&#10;D) diverted

Accepted Answer

A transistor must be biased to operate in the correct region of its characteristic curves for amplification. Biasing sets the transistor's operating point to allow for signal amplification without distortion.

Deck 12: The Transistor Amplifier