1
GATE ECE 2011
MCQ (Single Correct Answer)
+2
-0.6
The channel resistance of an N-channel JFET shown in the figure below is 600 W
when the full channel thickness (tch) of 10 μm is available for conduction. The
built-in voltage of the gate P+N junction (Vbi) is -1 V. When the gate to source
voltage (VGS) is 0 V, the channel is depleted by 1 μm on each side due to the built in
voltage and hence the thickness available for conduction is only 8 μm
The channel resistance when VGS = 0 V is

2
GATE ECE 2010
MCQ (Single Correct Answer)
+2
-0.6
In a uniformly doped BJT, assume that NE, NB and NC are the emitter, base and
collector dopings in atoms/cm3, respectively. If the emitter injection efficiency of
the BJT is close unity, which one of the following conditions is TRUE?
3
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
The DC current gain ($$\beta$$) of a BJT is 50. Assuming that the emitter injection
efficiency is 0.995, the base transport factor is:
4
GATE ECE 1999
MCQ (Single Correct Answer)
+2
-0.6
An n-channel JEFT has IDSS = 2 mA and Vp = −4 V. It's transconductance gm (in
mA/V) for an applied gate-to-source voltage VGS of –2V is:
GATE ECE Subjects
Signals and Systems
Network Theory
Control Systems
Digital Circuits
General Aptitude
Electronic Devices and VLSI
Analog Circuits
Engineering Mathematics
Microprocessors
Communications
Electromagnetics