BJT Study Exam Questions & Answers
2025/2026
Biasing of a transistor is purely a - ANSWERSdc operation
Amplifiers that are designed to handle small ac signals are usually called - ANSWERSsmall-signal
amplifiers
The purpose of biasing is to establish a _____________ where variations in current and voltage
can occur in response to an ac input - ANSWERSQ-point
A __________ provides amplification of a signal without any distortion so that output signal is
an exact amplified replica of the input signal. - ANSWERSlinear amplifier
As the sinusoidal collector current increases - ANSWERScollector voltage decreases
A transistor produces a __________ between the base voltage and the collector voltage -
ANSWERSphase inversion
A __________ model circuit uses various internal transistor parameters to represent its
operation - ANSWERStransistor
r'e - ANSWERSac emitter resistance
r'b - ANSWERSac base resistance
r'c - ANSWERSac collector resistance
, αac - ANSWERS(Ic/Ie)
βac - ANSWERS(Ic/Ib)
This is the resistance 'seen' looking into the emitter of a forward-biased transistor - ANSWERSr'e
Formula for r'e ≅ ? / IE - ANSWERS25 mV
A manufacturer's datasheet typically specifies __________ parameters because they are easy to
measure - ANSWERSh(hybrid)
hi - ANSWERSInput impedance (resistance) when output is shorted
hr - ANSWERSvoltage feedback ratio when input is open
hf - ANSWERSforward current gain when output is shorted
ho - ANSWERSoutput admittance(conductance) when input is open
The common-emitter (CE) configuration has the emitter as the - ANSWERScommon terminal, or
ground, to an ac signal
Common Emitters (CE) exhibit - ANSWERShigh voltage gain and high current gain
An ac signal is applied to the base terminal and the output is taken at the collector terminal so
the emitter is ____________ to both input and out signals - ANSWERScommon
2025/2026
Biasing of a transistor is purely a - ANSWERSdc operation
Amplifiers that are designed to handle small ac signals are usually called - ANSWERSsmall-signal
amplifiers
The purpose of biasing is to establish a _____________ where variations in current and voltage
can occur in response to an ac input - ANSWERSQ-point
A __________ provides amplification of a signal without any distortion so that output signal is
an exact amplified replica of the input signal. - ANSWERSlinear amplifier
As the sinusoidal collector current increases - ANSWERScollector voltage decreases
A transistor produces a __________ between the base voltage and the collector voltage -
ANSWERSphase inversion
A __________ model circuit uses various internal transistor parameters to represent its
operation - ANSWERStransistor
r'e - ANSWERSac emitter resistance
r'b - ANSWERSac base resistance
r'c - ANSWERSac collector resistance
, αac - ANSWERS(Ic/Ie)
βac - ANSWERS(Ic/Ib)
This is the resistance 'seen' looking into the emitter of a forward-biased transistor - ANSWERSr'e
Formula for r'e ≅ ? / IE - ANSWERS25 mV
A manufacturer's datasheet typically specifies __________ parameters because they are easy to
measure - ANSWERSh(hybrid)
hi - ANSWERSInput impedance (resistance) when output is shorted
hr - ANSWERSvoltage feedback ratio when input is open
hf - ANSWERSforward current gain when output is shorted
ho - ANSWERSoutput admittance(conductance) when input is open
The common-emitter (CE) configuration has the emitter as the - ANSWERScommon terminal, or
ground, to an ac signal
Common Emitters (CE) exhibit - ANSWERShigh voltage gain and high current gain
An ac signal is applied to the base terminal and the output is taken at the collector terminal so
the emitter is ____________ to both input and out signals - ANSWERScommon
