ELECS 25
Quiz
•
Mathematics, Physics, Chemistry
•
University
•
Hard
IECEP UDM
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50 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When a PN junction is forward biased, what happens to the depletion region?
The depletion region decreases.
The depletion region increases.
The depletion region disappears.
The depletion region remains the same.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When the reverse bias on a varactor is increased, what happens to the effective capacitance?
Capacitance increases.
Capacitance decreases.
Capacitance remains the same.
Temperature coefficient increases.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a reverse biased PN-junction, which current carriers cause leakage current?
The majority carriers.
The minority carriers.
The majority and minority carriers.
Either the majority or minority carriers.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The action of a PN-junction during breakdown can be explained by what two theories?
Zener effect and avalanche effect.
Zener and flywheel effects.
Avalanche and flywheel effects
Zener and Miller effects.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which breakdown theory explains the action that takes place in a heavily doped PN-junction with a reverse bias of less than 5 volts?
Miller effect
Avalanche effect
Zener effect
Flywheel effect
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The plate voltage of a tube will vary 126 volts when a 3-volt ac signal is applied to the control grid. What is the gain of this tube?
32
42
52
62
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
lf the mu of a tube is 85 and the signal at the control grid is 4 volts ac, the plate voltage will vary by what amount?
340 V
120 V
240 V
220 V
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