問題一覧
1
The distance a wave penetrates into a conductor before being completely absorbed is called
Skin depth
2
The gate voltage that must be applied to a field effect transistor for it to conduct current is called the
Threshold voltage
3
The main problem with the half-wave rectifier is
- It only uses the positive half cycle of the AC line voltage
4
The two types of transistors are the bipolar and the
field effect
5
The four key components of a wireless transmitter are oscillator, amplifier, antenna and
- Modulator
6
The frequency of an electromagnetic wave is expressed in units called
- Hertz
7
The piece of equipment that minimizes the “peaks and valleys” seen in the rectifiers output is the
- Transformer
8
Another way to smooth the DC output voltage of the rectifier is to add a
Half-wave buffer
9
The most widely used semiconductor material used in solid state electronic device is
Silicon
10
Solid state devices can fail due to
- Manufacturing defects
11
The advantages of transistors over vacuum tubes include size, cost, efficiency, reliability and
- ease of manufacturing
12
There are three key functions of logic circuits, these are to make decisions, preform math and
store information
13
The component of a DC power supply that convert AC to DC is the:
rectifier
14
A passive device that consists of two conductors separated by an insulator is a
Capacitor
15
What is the approximate built-in voltage,in mV, in silicone diodes
- 700
16
The drawback of a center-tap rectifier is that it requires a
center-tap transformer
17
The “dead zone” at the top of an antenna where the antenna does not transmit EM waves is called
- Null
18
The conductivity of a semiconductor can be easily modified through a process called
- Doping
19
In a receiver, the information signal is separated from the carrier frequency by the
Detector
20
The binary number system is referred to as a base -__ number system
- 2
21
The four key components of a DC power supply are transformer, rectifier, filter and
Tap changer
22
A diode only allows current to flow in one direction which makes them useful in
- determining break down voltages of electronic equipment?
23
The full wave length rectifier requires a total of _ diodes.
- 4
24
A diode will no longer block current and will start to conduct current when its breakdown voltage is exceeded by the
- reverse bias voltage