630 NEIEP
Which of the following describes semiconductor material with an excess of electrons after
adding phosphorus? N - type
What is the process of adding materials to silicon to make it a good semiconductor ?
Doping
Which of the following materials is useful as a semiconductor ?
Germanium
Which of the following describes the LED the best? emits light when biased appropriately What
is the voltage drop across a silicon diode that is forward biased ?
.7 volts
When the barrier voltage is reached above a forward biased silicon diode, what happens? The
diode conducts
On the diode, what are the terminal designations? Anode , cathode
For the circuit shown in Figure 1 , what will the output waveform look like ?
__n__n__
For the circuit shown in Figure 2 , what will the output waveform look like ?
nnnn
What type of rectifier uses four diodes to convert the AC to DC ?
Full - wave bridge
Which of the following statements is true for reading a good diode with a multimeter on the
Ohm's setting ?
It will read a very low resistance across the diode when forward biased .
Which of the following statements is true regarding zener diodes ?
They are intended to function with reverse bias. Which of the following statements is true
regarding varistors ?
They are used to prevent component damage from surges
Which best describes the operation of the photodiode ?
If connected with reverse bias, will behave when exposed to light. In Figure 3 , what is the
purpose of the diode and the 200 ohm resistor in the door open timer circuit ?
Provides a path for quick charging of C , when DO closes
Which of the following describes semiconductor material with an excess of electrons after
adding phosphorus? N - type
What is the process of adding materials to silicon to make it a good semiconductor ?
Doping
Which of the following materials is useful as a semiconductor ?
Germanium
Which of the following describes the LED the best? emits light when biased appropriately What
is the voltage drop across a silicon diode that is forward biased ?
.7 volts
When the barrier voltage is reached above a forward biased silicon diode, what happens? The
diode conducts
On the diode, what are the terminal designations? Anode , cathode
For the circuit shown in Figure 1 , what will the output waveform look like ?
__n__n__
For the circuit shown in Figure 2 , what will the output waveform look like ?
nnnn
What type of rectifier uses four diodes to convert the AC to DC ?
Full - wave bridge
Which of the following statements is true for reading a good diode with a multimeter on the
Ohm's setting ?
It will read a very low resistance across the diode when forward biased .
Which of the following statements is true regarding zener diodes ?
They are intended to function with reverse bias. Which of the following statements is true
regarding varistors ?
They are used to prevent component damage from surges
Which best describes the operation of the photodiode ?
If connected with reverse bias, will behave when exposed to light. In Figure 3 , what is the
purpose of the diode and the 200 ohm resistor in the door open timer circuit ?
Provides a path for quick charging of C , when DO closes
