ATT Test 6 Questions With Correct Answers
100% Verified
Which element in a FET controls current? - CORRECT ANSWER -Gate
What produces current flow in a FET? - CORRECT ANSWER -Positive bias attached to drain
What forms the barrier in a FET? - CORRECT ANSWER -Negative bias attached to gate
Is the gate to source forward or reverse biased in a FET? - CORRECT ANSWER -Reverse biased
What happens when negative gate voltage (Vgg) is increased in a FET? - CORRECT ANSWER -
Source to drain current decreases
What is JFET cutoff? - CORRECT ANSWER -a large negative gate voltage that increases junction
barrier so much that current flow stops (vgg > vdd)
What is JFET saturation? - CORRECT ANSWER -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? - CORRECT ANSWER -JFET saturation
What causes current flow to stop in JFET? - CORRECT ANSWER -JFET cutoff
What controls large source to drain currents? - CORRECT ANSWER -Small reverse bias voltages
, What class is the midpoint biased at in a FET? - CORRECT ANSWER -Class A
What class is cutoff biased at in a FET? - CORRECT ANSWER -Class B
What class is below cutoff biased at in a FET? - CORRECT ANSWER -Class C
Transconductance (gm) = ? - CORRECT ANSWER -Output current divided by input voltage
What is transconductance? - CORRECT ANSWER -Amount of control input voltage has over
output control
How does transconductance relate to resistance? - CORRECT ANSWER -It is the opposite of
resistance
FETs transfer _____ from input to output - CORRECT ANSWER -conductance
How is a FET biased? - CORRECT ANSWER -Positive voltage on drain, reverse bias source to gate
What are 4 types of biasing for FETs? - CORRECT ANSWER -Gate, self, volt divider, source
Which type of biasing is not stable and uses two voltage sources? - CORRECT ANSWER -Gate
biasing
Why are FETs used in amps instead of BJTs? - CORRECT ANSWER -HIGHER input resistance
What is the most commonly used FET amp? - CORRECT ANSWER -Common source
100% Verified
Which element in a FET controls current? - CORRECT ANSWER -Gate
What produces current flow in a FET? - CORRECT ANSWER -Positive bias attached to drain
What forms the barrier in a FET? - CORRECT ANSWER -Negative bias attached to gate
Is the gate to source forward or reverse biased in a FET? - CORRECT ANSWER -Reverse biased
What happens when negative gate voltage (Vgg) is increased in a FET? - CORRECT ANSWER -
Source to drain current decreases
What is JFET cutoff? - CORRECT ANSWER -a large negative gate voltage that increases junction
barrier so much that current flow stops (vgg > vdd)
What is JFET saturation? - CORRECT ANSWER -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? - CORRECT ANSWER -JFET saturation
What causes current flow to stop in JFET? - CORRECT ANSWER -JFET cutoff
What controls large source to drain currents? - CORRECT ANSWER -Small reverse bias voltages
, What class is the midpoint biased at in a FET? - CORRECT ANSWER -Class A
What class is cutoff biased at in a FET? - CORRECT ANSWER -Class B
What class is below cutoff biased at in a FET? - CORRECT ANSWER -Class C
Transconductance (gm) = ? - CORRECT ANSWER -Output current divided by input voltage
What is transconductance? - CORRECT ANSWER -Amount of control input voltage has over
output control
How does transconductance relate to resistance? - CORRECT ANSWER -It is the opposite of
resistance
FETs transfer _____ from input to output - CORRECT ANSWER -conductance
How is a FET biased? - CORRECT ANSWER -Positive voltage on drain, reverse bias source to gate
What are 4 types of biasing for FETs? - CORRECT ANSWER -Gate, self, volt divider, source
Which type of biasing is not stable and uses two voltage sources? - CORRECT ANSWER -Gate
biasing
Why are FETs used in amps instead of BJTs? - CORRECT ANSWER -HIGHER input resistance
What is the most commonly used FET amp? - CORRECT ANSWER -Common source
