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ATT Test #6: Questions And Answers (100% Accurate)
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ATT Test #6: Questions And Answers (100% Accurate)
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ATT Test #6: Questions And Answers (100% Accurate)Which element in a FET controls current? Right Ans - Gate
What produces current flow in a FET? Right Ans - Positive bias attached to
drain
What forms the barrier in a FET? Right Ans - Negative bias attached to gate
Is the gate to source forward or reverse biased in a FET? Right Ans -
Reverse biased
What happens when negative gate voltage (Vgg) is increased in a FET?
Right Ans - Source to drain current decreases
What is JFET cutoff? Right Ans - a large negative gate voltage that increases
junction barrier so much that current flow stops (vgg > vdd)
What is JFET saturation? Right Ans - A negative gate voltage so small that
decreases the junction barrier to a point where it no longer decreases,
constant current flow
What causes constant current flow in JFET? Right Ans - JFET saturation
What causes current flow to stop in JFET? Right Ans - JFET cutoff
What controls large source to drain currents? Right Ans - Small reverse
bias voltages
What class is the midpoint biased at in a FET? Right Ans - Class A
What class is cutoff biased at in a FET? Right Ans - Class B
What class is below cutoff biased at in a FET? Right Ans - Class C
Transconductance (gm) = ? Right Ans - Output current divided by input
voltage
, What is transconductance? Right Ans - Amount of control input voltage has
over output control
How does transconductance relate to resistance? Right Ans - It is the
opposite of resistance
FETs transfer _____ from input to output Right Ans - conductance
How is a FET biased? Right Ans - Positive voltage on drain, reverse bias
source to gate
What are 4 types of biasing for FETs? Right Ans - Gate, self, volt divider,
source
Which type of biasing is not stable and uses two voltage sources? Right Ans
- Gate biasing
Why are FETs used in amps instead of BJTs? Right Ans - HIGHER input
resistance
What is the most commonly used FET amp? Right Ans - Common source
Which FET amp inverts the output signal? Right Ans - Common source
What is the most common fault in FET amps? Right Ans - Semiconductor
(FET)
How do you check for normal operation in FET amps? Right Ans - Compare
measured to calculated Av (gain)
If gm is not known, what value is used? Right Ans - 2 milli mhos
How much bias voltage is applied to gate in common source amp? Right
Ans - 0V
What gives common source amp temp stability? Right Ans - Self biasing
Does Sierra like Bonnie or Clyde better? Right Ans - She loves them both
equally ;)
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