The common emitter short circuit current gain β of a transistor increases with I_C, for low I_C reaches maximum and then decreases with further increase in I_C.

Correct Option: C

The common emitter short circuit current gain β of a transistor increases with I_C, for low I_C reaches maximum and then decreases with further increase in I_C.

On increasing temperature there is increase in leakage current I_CBO or I_CO and we know that the collector current in BJT transistor is given by (i.e., fig)
Thus, from above expression we conclude that there is increase in BJT current (I_C) by rise in temperature.

Correct Option: B

On increasing temperature there is increase in leakage current I_CBO or I_CO and we know that the collector current in BJT transistor is given by (i.e., fig)
Thus, from above expression we conclude that there is increase in BJT current (I_C) by rise in temperature.

The current gain of a BJT is g_mr₀
Where, g_m = Transconductance of BJT amplifier
r₀ = Output resistance of BJT transistor

Correct Option: A

The current gain of a BJT is g_mr₀
Where, g_m = Transconductance of BJT amplifier
r₀ = Output resistance of BJT transistor

Introducing a resistor in the emitter of a common emitter amplifier stablize the dc operating point against variation by both temperature and β. We know that dc operating point or quicecent point or Q-point depends mainly on the following parameter.
● ICBO or ICO (i.e. leakage current)
● VBE (i.e. cut-in voltage)
(1 and 2)These two parameters are totally temperature dependent
● β (i.e. changes by changing the transistor)
Hence alternative (C) is the correct choice.

Correct Option: C

Introducing a resistor in the emitter of a common emitter amplifier stablize the dc operating point against variation by both temperature and β. We know that dc operating point or quicecent point or Q-point depends mainly on the following parameter.
● ICBO or ICO (i.e. leakage current)
● VBE (i.e. cut-in voltage)
(1 and 2)These two parameters are totally temperature dependent
● β (i.e. changes by changing the transistor)
Hence alternative (C) is the correct choice.

The β of a transistor may be determined directly from the curve plotted between V_CE and I_C, keeping base current, I_B constant.

Correct Option: A

The β of a transistor may be determined directly from the curve plotted between V_CE and I_C, keeping base current, I_B constant.