Question 1

The dimmer is an example of ____ control.&#10;A) analog&#10;B) programmable&#10;C) digital&#10;D) pneumatic

Accepted Answer

A dimmer is an example of analog control because it adjusts the current in a circuit to vary the amount of light produced, rather than using digital signals or programmable logic to control the output.

Question 2

The simplest way to describe the operation of a transistor is to say it operates like a(n) ____.&#10;A) diode&#10;B) electric valve&#10;C) triac&#10;D) ammeter

Accepted Answer

A transistor operates like an electric valve, regulating the flow of current between two points. It can be turned on and off, allowing for amplification or switching of electrical signals. It is not like a diode, triac, or ammeter.

Question 3

An analog device can be adjusted to different states.

Accepted Answer

Analog devices can be adjusted to different states or levels due to their continuous range of values.

Question 4

The transistor can be tested with a(n) ____.&#10;A) ammeter&#10;B) voltmeter&#10;C) ohmmeter&#10;D) multimeter

Accepted Answer

An ohmmeter can be used to test a transistor by checking the resistance between its terminals to determine if it is functioning properly.

Question 5

Transistors are made by joining two pieces of semiconductor material together.

Accepted Answer

Transistors are made by joining three layers of semiconductor material together, forming either a PNP or NPN structure, which allows them to amplify or switch electronic signals.

Question 6

With a transistor, the amount of base-emitter current is small when compared to the collector-emitter current.

Accepted Answer

This is true for most transistors. The base-emitter junction is designed to have a lower forward voltage drop than the collector-emitter junction, leading to a small base current controlling a larger collector current.

Question 7

The NPN transistor must have positive connected to the ____.&#10;A) PNP&#10;B) emitter&#10;C) base&#10;D) collector

Accepted Answer

In an NPN transistor, the collector must always be connected to a positive voltage source, while the emitter is connected to a negative or ground potential. The base terminal controls the flow of current between the collector and emitter, but it is not necessarily connected to a positive voltage source. Therefore, the correct answer is D) collector.

Question 8

If a very high resistance is indicated by the ohmmeter, the transistor is shorted

Accepted Answer

If a very high resistance is indicated by the ohmmeter, it means that there is an open circuit or no connection between the two terminals. A shorted transistor would give a low resistance reading on the ohmmeter.

Question 9

If the polarity of the output of the ohmmeter leads is known, the transistor can be identified as either NPN or PNP.

Accepted Answer

True, because the polarity of the output of the ohmmeter leads can be used to determine the polarity of the transistor.

Question 10

If a very low resistance is indicated by an ohmmeter, the transistor is ____.&#10;A) leaky&#10;B) shorted&#10;C) open&#10;D) still operable

Accepted Answer

A very low resistance indicated by an ohmmeter indicates that there is a short in the circuit, which means the transistor is shorted.

Deck 52: The Transistor