Semiconductors and Diodes Knowledge Test – 10 Questions
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How does the conductivity of semiconductors change as temperature increases?
A) Decreases
B) Increases
C) Remains the same
Which material is added (doping) to create P-type semiconductor?
A) Arsenic
B) Boron
C) Phosphorus
When a diode is reverse biased, what is its current conduction state?
A) High current flows
B) Very low current flows
C) No current flows at all
What is the primary purpose of a Zener diode?
A) Rectification
B) Voltage regulation
C) Amplification
What are the three legs of a BJT transistor?
A) Anode, Cathode, Gate
B) Base, Collector, Emitter
C) Source, Drain, Grid
In a BJT transistor, what does the current gain (β) represent?
A) Base current / Collector current
B) Collector current / Base current
C) Emitter current / Collector current
What principle does an LED operate on?
A) Thermionic emission
B) Electroluminescence
C) Photoelectric effect
How many diodes are used in a full-wave bridge rectifier?
A) 1
B) 2
C) 4
What is the approximate barrier voltage for a silicon semiconductor diode?
A) 0.3 V
B) 0.7 V
C) 1.2 V
What is the biggest advantage of a MOSFET transistor?
A) High current gain
B) Very high input impedance
C) Not low cost
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