1
GATE ECE 2010
MCQ (Single Correct Answer)
+2
-0.6
The silicon sample with unit cross-sectional area shown below is in thermal
equilibrium. The following information is given: T=300K, electronic charge=1.6x10-
19C, thermal voltage=26mV and electron mobility = 1350cm2/V-s

The magnitude of the electron drift current density at x=0.5 μm is
2
GATE ECE 2010
MCQ (Single Correct Answer)
+2
-0.6
The silicon sample with unit cross-sectional area shown below is in thermal
equilibrium. The following information is given: T=300K, electronic charge=1.6x10-
19C, thermal voltage=26mV and electron mobility = 1350cm2/V-s

The magnitude of the electric field at x=0.5 μm is
3
GATE ECE 2005
MCQ (Single Correct Answer)
+2
-0.6
A silicon sample 'A' is doped with 1018 atoms/cm3 of Boron. Another sample 'B' of
identical dimensions is doped with 1018 atoms/cm3 of Phosphorus. The ratio of
electron to hole mobility is 1/3. The ratio of conductivity of the sample A to B is
4
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
An n-type silicon bar 0.1 cm long and $$100\;\mu m^2$$ in cross-sectional area has a majority
carrier concentration of $$5\times10^{20}/m^3$$ and the carrier mobility is $$0.13\;\;m^2/v-s\;$$ at
300oK. if the charge of an electron is 1.6×10-19 coulomb, then the resistance of the
bar is
Questions Asked from Marks 2
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