26404-17
When used in a circuit, an LED is generally operated at about
20mA or less
Which of the following makes the best conductor?
Aluminum
One end of a diode has a beveled end which indicates that it is the _______ .
Cathode
Which of the following can be thought of as an AC switch?
Diac
How many diodes are required to form a bridge rectifier?
Four
The figure above shows the electrical symbol for a(n)______
NPN transistor
What is the average number of valence electrons in a conductor atom?
One or two
What semiconductor material comprises the base of an NPN transistor?
P-type germanium
What is the name given to the areas where P-type materials join N-type materials to form a diode?
PN junction
An SCR is made from adjoining layers of semiconductor material in the________
PNPN arrangement
_________ are used to convert AC power to DC power.
Rectifier diodes
Which of the following is an excellent conductor but too expensive to use on a larger scale?
Silver
How many diodes are required to convert three-phase AC power to high-efficiency DC power?
Six
High-power transistors are manufactured in which configurations?
Studs and heats sinks
Which statement about transistors is correct?
There are three types of junction field-effect transistors.
A transistor is made by joining how many layers of semiconductor material?
Three
The applied voltage does not have to exceed the breakover voltage in order for conduction to begin on a(n)__________
Triac
Which of the following can be viewed as a diac with a gate terminal added?
Triac
How many diodes are required to form a transformer center-tap full-wave rectifier circuit?
Two
The schematic symbol for an LED is the same as that of a diode with the addition of ______ .
an arrow pointing away from the diode
On a transistor, control voltages are applied to the________
base
A__________________rectifier will produce the smoothest DC output voltage.
bridge
In the figure above, the lead marked C is the transistor___________
collector
In order to permit the emergence of the maximum number of photons in an LED, the conducting surface___________
connected to the P-type material is much smaller
The process of giving off light by applying an electrical source of energy is called
electroluminescence
In the figure above, the lead marked A is the transistor__________
emitter
By adding ____________________to semiconductor material, P-type material will be created.
gallium
The two basic types of diodes are the silicon and the___________
germanium
The difference between an SCR and a diode is that an SCR_______
has three terminals
The point at which avalanche break over occurs in a diode is known as the_________
peak inverse voltage
The difference between an N-channel and a P-channel JFET is_______
the polarity of the voltage
The term solid state refers to_____________
the use of semiconductor material in electronic components
When possible, transistor casings will have some marking to indicate_____
which leads are connected to the emitter, collector, or base
Silicon is widely used as a semiconductor because it
withstands heat
