Question 1

In an optoisolator, a ____ is used to trigger a phototransistor.&#10;A) light-emitting diode&#10;B) transistor&#10;C) rectifier&#10;D) rheostat

Accepted Answer

An optoisolator uses a light-emitting diode (LED) to produce light when activated, which then triggers a phototransistor on the other side of an insulating barrier, allowing for electrical isolation between input and output.

Question 2

When a transistor is driven into saturation, its frequency response is increased.

Accepted Answer

When a transistor is driven into saturation, its frequency response actually decreases because the transistor cannot switch off quickly enough, leading to slower response times and reduced bandwidth.

Question 3

Most motor controllers and induction heating equipment seldom operate above about 100 Hz.

Accepted Answer

Motor controllers and induction heating equipment often operate at frequencies much higher than 100 Hz, sometimes going into the kilohertz (kHz) range, to improve efficiency and control.

Question 4

The transistor is often used as a simple switch.

Accepted Answer

Transistors can function as switches by controlling the flow of current through their collector-emitter path with the base-emitter signal, allowing them to turn on or off circuits.

Question 5

If the transistor is driven into saturation, the voltage drop between the collector and the emitter will be about ____ volts.&#10;A) .3&#10;B) .5&#10;C) .7&#10;D) .9

Accepted Answer

When a transistor is in saturation, the collector-emitter voltage drop is typically very low, around 0.2 to 0.3 volts.

Question 6

____ is used to keep voltage spikes, caused by switching large currents on and off, from &#34;talking&#34; to the electronic control section of the circuit.&#10;A) Isolation&#10;B) Induction&#10;C) Optoisolation&#10;D) Mechanical isolation

Accepted Answer

Optoisolation is used to prevent voltage spikes, which can occur when switching large currents on and off, from affecting the electronic control section of a circuit. It does this by using light to transfer a signal between parts of a circuit while keeping them electrically isolated.

Question 7

A transistor is used as a switch in place of a regular mechanical switch because it can ____.&#10;A) limit power&#10;B) filter power&#10;C) distribute power&#10;D) operate several thousand times a second

Accepted Answer

Transistors can switch on and off several thousand times a second, much faster than mechanical switches, making them useful in many electronic applications.

Question 8

An advantage of using the transistor as a switch is its ability to ____.&#10;A) vary power&#10;B) handle power&#10;C) divert power&#10;D) convert power

Accepted Answer

Transistors are capable of handling power, making them useful as switches in various electronic circuits. They can control a large current in the output circuit with a much smaller current in the input circuit.

Question 9

A very common application for a transistor switch is the electronic ignition system of most automobiles.

Accepted Answer

Transistor switches are commonly used in electronic ignition systems of automobiles to control the ignition coil, which generates the high voltage needed for spark plugs, replacing older mechanical points systems for better efficiency and reliability.

Question 10

The versatility of the transistor switch permits it to be operated by a variety of sensing devices such as&#160; devices that sense light, sound, temperature, and magnetic induction.

Accepted Answer

Transistor switches can indeed be operated by various sensing devices that detect changes in light, sound, temperature, and magnetic fields, allowing them to act in response to a wide range of physical stimuli.

Deck 11: The Transistor Switch