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1
GATE ECE 2008
MCQ (Single Correct Answer)
+1
-0.3
The drain current of a MOSFET in saturation is given by $$I_D\;=\;K\left(V_{GS}\;-V_T\right)^2$$ where 'K' is a constant. The magnitude of the transconductance gm is
A
$$\frac{K\left(V_{GS}\;-\;V_T\right)^2}{V_{DS}}$$
B
$$2K\left(V_{GS}\;-\;V_T\right)$$
C
$$\frac{I_d}{V_{GS}\;-\;V_{DS}}$$
D
$$\frac{K\left(V_{GS}\;-\;V_T\right)^2}{V_{GS}}$$
2
GATE ECE 2008
MCQ (Single Correct Answer)
+1
-0.3
A silicon wafer has 100 mm of oxide on it and is inserted in a furnace at a temperature above 1000ºC for further oxidation in dry oxygen. The oxidation rate
A
is independent of current oxide thickness and temperature
B
is independent of current oxide thickness but depends on temperature
C
slows down as the oxide grows
D
is zero as the existing oxide prevents further oxidation
3
GATE ECE 2005
MCQ (Single Correct Answer)
+1
-0.3
A MOS capacitor made using p-type substrate is in the accumulation mode. The dominant charge in the channel is due to the presence of
A
holes
B
electrons
C
positively charged ions
D
negatively charged ions
4
GATE ECE 2004
MCQ (Single Correct Answer)
+1
-0.3
Consider the following statements S1 and S2.


S1: The threshold voltage (VT) of a MOS capacitor decreases with increase in gate oxide thickness

S2: The threshold voltage (VT) of a MOS capacitor decreases with increase in substrate doping concentration.

Which one of the following is correct?
A
S1 is FALSE and S2 is TRUE
B
both S1 and S2 are TRUE
C
S1 is TRUE and S2 is FALSE
D
both S1 and S2 are FALSE
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GATE ECE Subjects
Signals and Systems
Representation of Continuous Time Signal Fourier Series Discrete Time Signal Fourier Series Fourier Transform Discrete Time Signal Z Transform Continuous Time Linear Invariant System Transmission of Signal Through Continuous Time LTI Systems Discrete Time Linear Time Invariant Systems Sampling Continuous Time Signal Laplace Transform Discrete Fourier Transform and Fast Fourier Transform Transmission of Signal Through Discrete Time Lti Systems Miscellaneous Fourier Transform
Network Theory
State Equations For Networks Network Elements Network Theorems Two Port Networks Transient Response Sinusoidal Steady State Response Network Graphs Miscellaneous
Control Systems
Basic of Control Systems Signal Flow Graph and Block Diagram Time Response Analysis Stability Root Locus Diagram Frequency Response Analysis Compensators State Space Analysis
Digital Circuits
Number System and Code Convertions Boolean Algebra Logic Gates Combinational Circuits Sequential Circuits Semiconductor Memories Logic Families Analog to Digital and Digital to Analog Converters
General Aptitude
Numerical Ability Logical Reasoning Verbal Ability
Electronic Devices and VLSI
Semiconductor Physics PN Junction BJT and FET IC Basics and MOSFET
Analog Circuits
Diodes Bipolar Junction Transistor Frequency Response FET and MOSFET Oscillators Operational Amplifier Feedback Amplifier Power Amplifier 555 Timer
Engineering Mathematics
Linear Algebra Calculus Vector Calculus Probability and Statistics Differential Equations Complex Variable Numerical Methods Transform Theory
Microprocessors
Instruction Set and Programming with 8085 Pin Details of 8085 and Interfacing with 8085
Communications
Fundamentals of Information Theory Noise In Digital Communication Analog Communication Systems Digital Communication Systems Random Signals and Noise
Electromagnetics
Waveguides Antennas Miscellaneous Transmission Lines Maxwell Equations Uniform Plane Waves
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