Transistor Bias Circuits

A signal that swings outside the active area will be

• clamped

  
  

•  clipped

• unstable

  
  

• all of the above

  
  

 A stiff voltage divider is one in which

• there is no load current

  
  

• divider current is small compared to load current

  
  

• the load is connected directly to the source voltage

  
  

• loading effects can be ignored

  
  

Assuming a stiff voltage-divider for the circuit shown, the emitter voltage is

•  4.3 V

  
  

• 5.7 V

  
  

• 6.8 V

  
  

• 9.3 V

  
  

For the circuit shown, the dc load line will intersect the y-axis at

• 5.0 mA

  
  

• 10.0 mA

  
  

• 15.0 mA

  
  

• none of the above

  
  

. If you Thevenize the input voltage divider, the Thevenin resistance is 

•  5.0 kΩ

  
  

• 6.67 kΩ

  
  

• 10 kΩ

  
  

•  30 kΩ

  
  

For the circuit shown, the emitter voltage is

• less than the base voltage

  
  

• less than the collector voltage

  
  

•  both of the above

  
  

• none of the above

  
  

Emitter bias 

• is not good for linear circuits

  
  

• uses a voltage-divider on the input

  
  

• requires dual power supplies

  
  

• all of the above

  
  

With the emitter bias shown, a reasonable assumption for troubleshooting work is that the 

• base voltage = +1 V

  
  

• emitter voltage = +5 V

• emitter voltage = −1 V

  
  

• collector voltage = VCC

  
  

The circuit shown is an example of 

• base bias

  
  

• collector-feedback bias

• emitter bias

  
  

• voltage-divider bias

  
  

The circuit shown is an example of 

• base bias

  
  

•  collector-feedback bias

  
  

• emitter bias

  
  

• voltage-divider bias