13.2.1 Understanding bipolar junction transistors (BJTs)

• What type of voltage is required at the base of an NPN BJT to conduct?

  Positive
• In the symbol for an NPN BJT, the collector and emitter arrows point outwards.


  True
• The typical current gain for NPN BJTs ranges from 50 to 500.

  True
• The common emitter configuration is typically used in audio amplifiers because it provides high voltage and current gain.
• Match the feature with the correct BJT type:

  Collector current flows from emitter to collector ↔️ NPN

  Collector current flows from collector to emitter ↔️ PNP
• The formula for current gain in NPN BJTs is β = IC / IB.

  True
• The base current in NPN BJTs is positive.


  True
• Biasing is crucial for a BJT to function as an amplifier or switch.


  True
• What are the three common BJT configurations used in electronic circuits?

  CE, CB, CC
• In which application is the common emitter configuration often used?

  Switching circuits
• The emitter of a BJT emits charge carriers into the base
• The charge carriers in PNP BJTs are holes.

  True
• In a PNP BJT, the emitter is made of p-type
• Electrons are the charge carriers in a PNP BJT.

  False
• What type of base current is required in an NPN BJT for current amplification?

  Positive
• Match the BJT configuration with its key feature:

  Common Emitter ↔️ High voltage and current gain

  Common Base ↔️ High voltage gain, low current gain

  Common Collector ↔️ High current gain, low voltage gain
• The common collector configuration provides high current gain and low output impedance.

  True
• BJTs involve two p-n junctions connected back-to-back.


  True
• BJTs are classified into two types: NPN and PNP
• A PNP BJT requires negative voltage at the base to conduct
• The base of a BJT controls the current flow between the emitter and the collector.


  True
• Holes are the primary charge carriers in a PNP BJT.


  True
• Bipolar Junction Transistors (BJTs) come in two types based on the arrangement of p-type and n-type semiconductor layers: NPN and PNP
• PNP BJTs require a negative voltage at the base
• The current gain in a BJT is also known as beta
• The base current in a PNP BJT is negative
• Common emitter, common base, and common collector are the three main configurations of BJTs.

  True
• Which BJT configuration provides current gain and impedance matching?

  Common collector
• For NPN BJTs, the current gain is calculated as the ratio of collector current to base current
• In both NPN and PNP BJTs, the current gain (β) typically ranges from 50 to 500
• Match the BJT component with its function:

  Emitter ↔️ Emits charge carriers into the base

  Base ↔️ Controls the current flow

  Collector ↔️ Collects the charge carriers
• BJTs are classified into NPN and PNP types based on semiconductor layer arrangement.


  True
• Holes are the charge carriers in PNP BJTs.


  True
• An NPN BJT requires a positive voltage at the base
• A PNP BJT requires a negative voltage at the base
• A BJT consists of three terminals: Base, Collector, and Emitter
• The base of a BJT controls the current flow between the collector and the emitter
• Match the BJT component with its function:

  Emitter ↔️ Emits charge carriers

  Base ↔️ Controls current flow

  Collector ↔️ Collects charge carriers
• What type of charge carriers flow in an NPN BJT?

  Electrons
• What is the function of the emitter in a BJT?

  Emits charge carriers