The hybrid-π model of a BJT is useful for analysis at all frequency ranges and variation of other transistor parameters.
a) true
b) false
Q.2.
If the Sand Sparameters of a common emitter operated BJT is high:
a) then the output and input ports are matched well
b) there is mismatch in the ports
c) the gain of the amplifier is high
d) none of the mentioned
Q.3.
If a common emitter configuration BJT is treated as a two port network, the gain of the amplifier is roughly given by the S parameter:
a) S11
b) S12
c) S21
d) S22
Q.4.
Short circuit current gain of BJT is given by the expression:
a) gm/ωC
b) ωC/ gm
c) gm/C
d) none of the mentioned
Q.5.
The output collector to emitter current of a BJT amplifier is independent of the input base current of the amplifier.
a) true
b) false
Q.6.
The current gain of a BJT ________ with frequency.
a) increases
b) decreases
c) remains constant
d) none of the mentioned
Q.7.
If a transistor has a short circuit current gain ofand the capacitance measured in the hybrid-π model of the transistor waspF. Then the threshold frequency of operation of the transistor is:
a) 60 MHz
b) 45.6 GHz
c) 66.3 GHz
d) 34.8 GHz
Q.8.
Hetero junction bipolar transistors have the same working principle and operation as that of a BJT.
a) true
b) false
Q.9.
Advantage of HJT over BJT is that it has:
a) higher gain
b) high frequency of operation
c) sophisticated construction
d) none of the mentioned
Q.10.
The Sparameter of a HJT increases with increase in the operating frequency of the transistor.
a) true
b) false
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