Diodes: PN junction, types (Zener, Schottky, etc.), and applications MCQs

1. A diode is a device that allows current to flow in:
A. Both directions
B. Only one direction
C. Alternating current only
D. Direct current only

Answer: B. Only one direction


2. In a PN junction diode, the P-type material is rich in:
A. Electrons
B. Holes
C. Neutrons
D. Protons

Answer: B. Holes


3. The N-type material of a PN junction diode is doped with elements that have:
A. One less electron than silicon
B. More electrons than silicon
C. The same number of electrons as silicon
D. No free electrons

Answer: B. More electrons than silicon


4. When a forward voltage is applied to a PN junction diode, the diode:
A. Acts like an open circuit
B. Allows current to pass through
C. Blocks current from passing
D. Becomes non-conductive

Answer: B. Allows current to pass through


5. The reverse bias condition in a PN junction diode results in:
A. Current flowing freely
B. No current flow
C. An increase in current
D. A decrease in voltage across the diode

Answer: B. No current flow


6. A Zener diode is primarily used for:
A. Voltage regulation
B. Amplification
C. Light emission
D. Switching applications

Answer: A. Voltage regulation


7. The main characteristic of a Zener diode is that it allows current to flow in the reverse direction when the reverse voltage exceeds a certain value called the:
A. Breakdown voltage
B. Forward voltage
C. Peak voltage
D. Threshold voltage

Answer: A. Breakdown voltage


8. Schottky diodes are known for their:
A. Low forward voltage drop
B. High reverse breakdown voltage
C. High capacitance
D. Slow switching speed

Answer: A. Low forward voltage drop


9. Light Emitting Diodes (LEDs) are used in:
A. Voltage regulation
B. Signal amplification
C. Light emission for displays
D. Current limiting

Answer: C. Light emission for displays


10. The main advantage of a Schottky diode over a standard PN junction diode is:
A. Higher voltage tolerance
B. Faster switching speed
C. Higher current carrying capacity
D. Lower reverse leakage current

Answer: B. Faster switching speed


11. In a rectifier circuit, a diode is used to:
A. Block AC current
B. Allow only the positive half-cycle of AC
C. Convert DC to AC
D. Amplify the AC signal

Answer: B. Allow only the positive half-cycle of AC


12. Which of the following is a typical application of a Zener diode?
A. Voltage stabilizer in power supplies
B. Signal modulation
C. Frequency mixing in radios
D. Light emission in displays

Answer: A. Voltage stabilizer in power supplies


13. A diode used in solar cells is primarily used to:
A. Convert light energy to electrical energy
B. Rectify the AC output of the solar panel
C. Store electrical energy
D. Control the temperature of the panel

Answer: A. Convert light energy to electrical energy


14. Which type of diode is typically used for creating a sharp frequency cut-off in high-frequency circuits?
A. Zener diode
B. Schottky diode
C. Tunnel diode
D. Light-emitting diode (LED)

Answer: C. Tunnel diode


15. In a TV remote control, the diode used is typically a:
A. Zener diode
B. Schottky diode
C. Light Emitting Diode (LED)
D. Tunnel diode

Answer: C. Light Emitting Diode (LED)

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