IES EC Government Jobs Exams Logical Reasoning

Q. Consider the following parameters of a hybrid-it equivalent circuit of BJT:
1. Transconductance (gm)
2. hfe
3. hie
Which of the above parameters vary with temperature in similar manner (all of them decrease or all of them increase)?

Select the correct answer using the codes given below:

a. Only 1 and 2
b. Only 2 and 3
c. Only 1 and 3
d. 1, 2 and 3

Read Solution (Total 2)

ans a
hie input impedence independent w.r.t. temp
10 years agoHelpfull: Yes(0) No(0)

a.only 1 and 2
10 years agoHelpfull: Yes(0) No(0)

IES EC Other Question

Q. What is the phase shift between the input and output voltage in a common-base small signal amplifier (assuming ideal coupling and bypass capacitors)?
a. 180°
b. -180°
c. 0°
d. None of the above Q. When used for amplification, the output port side of a BJT behaves as controlled current source. According to the above, the variation of which one of the following does not change the output current of an
ideal BLT? (The BJT is being used in a common emitter amplifier circuit)

a. Load resistance
b. Collector to base bias voltage
c. Both load resistance and collector to base bias voltage
d. Base-emitter bias voltage