Test 9 Flashcards
A ___ transistor is formed by sandwiching a thin layer of N-type material between two layers of P-type material.
PNP
In both types of BJTs the terminal used is the ___.
All of the above
The ___ current is a critical factor in determining the amount of current flow in a transistor.
Base
In a transistor base circuit, ___ indicates the voltage drop across the base-emitter junction.
Vbe
In a transistor collector circuit, ___ indicates the collector-emitter voltage.
Vce
Transistor operating curves on a graph are known as collector ___ curves.
Characteristic
The collector current (iC) on the vertical axis of a characteristic curve is measured in ___.
milliamps
On a collector characteristic curve, a variety of base currents ranging from ___ to ___ are available.
0.1mA; 1.2mA
A ___ region is the region of a characteristic curve in which maximum current can flow in a transistor circuit.
Saturation
A ___ diode is a diode that prevents voltage from one part of a circuit from exceeding the voltage in another part.
Clamping
With ___ bias, the amount of base current is dependent upon the value of the limiting resistor and the resistance of the base-emitter junction.
Base
Bias stabilization circuits can be used to protect ___ in addition to heat sinking.
Transistor
The most common bias stabilization circuit is the ___ bias stabilization circuit.
Emitter-feedback, Collector-feedback, combination. All of the above.
An emitter-feedback bias stabilization circuit is created by placing a resistor in series with the ___.
emitter
A combination bias stabilization circuit is created by both ___ -feedback and collector-feedback circuits.
emitter
One of the greatest dangers to a transistor is ___, which causes excessive current flow and damage.
Heat
___ can damage a transistor.
High voltages, Improper connections, Overheating
All of the above.
A ___ is a point level measuring system that uses two electrodes to determine the level of liquid in a vessel.
None of the above
When a transistor is turned all the way on it is said to be in the ___ mode.
Saturated
When a transistor is turned all the way off it is said to be in the ___ mode.
Cutoff
The two types of BJTs are NPN and PNP.
T
BJTs are referred to as bipolar because both holes and electrons are used as internal carriers for maintaining electron flow.
T
When a transistor with a specific shape must be used, a transistor model number is used for reference.
F
In any transistor circuit, the base-emitter junction must always be reversed biased and the collector-base junction must always be forward biased.
F
Individual PN junctions can be used in combination with three bias configurations.
F
The base-emitter junction can be forward biased while the collector-base junction is reversed biased.
T
One method of limiting the base current in a transistor is to use a series-limiting resistor.
T
Transistors are manufactured to perform different functions under a variety of operating conditions.
T
In a collector characteristic curve, the vertical axis indicates Vce.
F
Collector characteristic curves are essential in predicting the operating condition of a transistor in a circuit.
T
Current gain in a transistor is symbolized by the Greek letter beta.
T
The primary motivation behind the rapid development of the transistor was to replace mechanical switching.
T
Mechanical switches have two conditions: open and closed or ON and OFF.
T
A transistor biased for saturation has the collector-base junction forward biased.
F
Decreasing forward-bias voltage on a base causes the current through a transistor to increase.
F
A transistor cannot be biased from a single fixed-voltage source.
F
Bias stabilization circuits are designed to counteract the cumulative current increase due to a rise in temperature.
T
Thermistors are also used for bias stabilization.
T
In order to protect the transistor, the maximum power dissipation curve must be considered.
T
In theory, a transistor should last indefinitely.
T
To determine if a transistor is good or bad, a digital multi meter or a transistor tester can be used.
T
Identifying an NPN and PNP transistor is good or bad, a digital multimeter or a transistor tester can be used.
F
On a good transistor, one test lead should indicate the the junction has high resistance and is forward biased.
F
A diode passes current when it is reversed biased.
F
It is impossible to determine whether a transistor is switched ON or OFF just by visual inspection.
T
The main components of a water level detector circuit consist of a simple, low-cost transistor and an electronic timer.
F
In a beverage dispensing gun transistor, the base-emitter current is very high compared to the collector-emitter current.
F
By switching various combinations of transistors ON or OFF, different numbers can be created on a seven-segment display.
T
Transistors are used for switching because of their reliability and speed.
T
High voltages, improper connections, and overheating can damage a transistor.
T
