What is the primary function of a PN junction diode?
a) To store electrical charge
b) To allow current to flow in only one direction
c) To amplify signals
d) To regulate voltage
What happens when a PN junction diode is forward biased?
a) The diode allows current to flow
b) The diode prevents current from flowing
c) The diode amplifies the signal
d) The diode behaves like a capacitor
Which region of a PN junction diode is negatively charged?
a) P-type region
b) N-type region
c) Depletion region
d) Both P and N regions
What is the purpose of the depletion region in a PN junction diode?
a) To allow current to flow freely
b) To prevent reverse current flow
c) To store charge carriers
d) To act as a capacitor
What happens when a PN junction diode is reverse biased?
a) Current flows freely in both directions
b) The diode blocks current in both directions
c) The diode allows current to flow in one direction
d) The diode generates heat
Which of the following is true for a Zener diode?
a) It allows current to flow in both directions
b) It is designed to operate in reverse bias only
c) It has a very high forward voltage
d) It is used to rectify alternating current
What type of material is used to create the N-type region in a diode?
a) Silicon with added boron
b) Silicon with added phosphorus
c) Germanium with added boron
d) Germanium with added phosphorus
Which of the following is the primary characteristic of an ideal diode?
a) It allows current to flow in both directions
b) It has zero resistance in the forward direction
c) It has high resistance in the reverse direction
d) It produces a voltage drop in the forward direction
Which type of diode is commonly used for signal modulation in radio communications?
a) Light-emitting diode (LED)
b) Schottky diode
c) Zener diode
d) Varactor diode
What is the primary purpose of a light-emitting diode (LED)?
a) To amplify light
b) To store energy
c) To convert electrical energy into light
d) To rectify AC to DC
What is the typical voltage drop across a silicon PN junction diode when forward biased?
a) 0.1V
b) 0.3V
c) 0.7V
d) 1.0V
What is the main characteristic of a Schottky diode?
a) It has a low forward voltage drop
b) It allows current to flow in both directions
c) It is used for rectification in AC circuits
d) It is primarily used for voltage regulation
What is the primary function of a PN junction diode in a rectifier circuit?
a) To store electrical energy
b) To convert AC to DC
c) To increase voltage
d) To filter the output signal
Which of the following is a feature of a reverse-biased PN junction diode?
a) Current flows freely through the diode
b) The diode blocks current flow
c) The diode emits light
d) The diode conducts at low voltage
In which application is a Zener diode commonly used?
a) Signal amplification
b) Voltage regulation
c) Light emission
d) Current limiting
What is the primary difference between a PN junction diode and a Zener diode?
a) A Zener diode has a higher forward voltage drop
b) A Zener diode is designed to work in reverse breakdown
c) A Zener diode conducts in both directions
d) A Zener diode only works in forward bias
What is the function of a diode in a voltage regulator circuit?
a) To amplify the input signal
b) To convert AC into DC
c) To maintain a constant output voltage
d) To rectify signals
Which of the following diodes is used in solar cells?
a) Schottky diode
b) Zener diode
c) Light-emitting diode (LED)
d) PN junction diode
What is the primary application of a photodiode?
a) Signal amplification
b) Light detection
c) Voltage regulation
d) Power conversion
Which of the following statements is true about a reverse-biased diode?
a) The diode acts as a short circuit
b) The diode conducts freely in both directions
c) The diode prevents current flow
d) The diode generates heat when forward biased
In which of the following applications are diodes used as switches?
a) Amplifiers
b) Voltage regulation circuits
c) Digital logic circuits
d) Rectifiers
What is the main use of a Zener diode in a circuit?
a) To store charge
b) To amplify signals
c) To regulate voltage
d) To rectify AC
Which type of diode is most commonly used for signal detection in radio receivers?
a) Zener diode
b) Schottky diode
c) Photodiode
d) PN junction diode
What is the voltage at which a Zener diode starts to conduct in reverse bias known as?
a) Forward voltage
b) Reverse breakdown voltage
c) Maximum forward voltage
d) Peak reverse voltage
Which of the following is a feature of a light-emitting diode (LED)?
a) It only works in reverse bias
b) It emits light when forward biased
c) It is used in voltage regulation circuits
d) It rectifies alternating current
What happens to the current in a PN junction diode when the reverse bias voltage increases?
a) The current increases linearly
b) The current becomes constant
c) The current decreases to zero
d) The current increases exponentially
Which of the following is a characteristic of a Zener diode?
a) It conducts in forward bias and blocks current in reverse bias
b) It has a high voltage drop
c) It operates in reverse breakdown to maintain a constant voltage
d) It generates light when forward biased
What is the primary use of a Schottky diode?
a) In digital circuits for switching
b) In voltage regulation circuits
c) As a rectifier in high-frequency applications
d) For light emission
