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1
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
A rectangular waveguide has dimensions $$1\,\,cm\,\, \times \,\,0.5\,\,cm$$. Its cut-off frequency is
A
5 GHz
B
10 GHz
C
15 GHz
D
20 GHz
2
GATE ECE 1993
MCQ (Single Correct Answer)
+2
-0.6
An optical fiber consists of a cylindrical dielectric rod of refractive index $$n_1$$, surrounded by another dielectric of refractive index $$n_2$$ where $$n_2$$ < $$n_1$$ as shown in the following Fig. If a ray is incident from air at angle i to the axis, then it undergoes total internal reflection at the interface AB if GATE ECE 1993 Electromagnetics - Waveguides Question 13 English
A
$$i\,\, \ge \,\,{\sin ^{ - 1}}\,\sqrt {{n_1}^2 - {n_2}^2} $$
B
$$i\,\, < \,\,{\sin ^{ - 1}}\,\sqrt {{n_1} - {n_2}} $$
C
$$i\,\, \le \,\,{\sin ^{ - 1}}\,\sqrt {{n_1}^2 - {n_2}^2} $$
D
$$i\,\, = \,\,{\sin ^{ - 1}}\,\sqrt {{n_1} - {n_2}} $$
3
GATE ECE 1990
MCQ (More than One Correct Answer)
+2
-0.6
Choose the correct statements.
For a wave propagating in an air filled rectangular wave guide
A
Guided wavelength is never less than the free space wavelength
B
Wave impedance is never less than the free space impedance.
C
Phase velocity is never less than the free space velocity
D
TEM mode is possible if the dimensions of the wave guide are properly chosen.
4
GATE ECE 1988
MCQ (More than One Correct Answer)
+2
-0.6
For a normal mode EM wave propagating in a hollow rectangular wave guide
A
the phase velocity is greater than the group velocity
B
the phase velocity is greater than velocity of light in free space
C
the phase velocity is less than the velocity of light in free space
D
the phase velocity may be either greater than or less than the group velocity
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GATE ECE Subjects
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
Electronic Devices and VLSI
Semiconductor Physics PN Junction BJT and FET IC Basics and MOSFET
Analog Circuits
Bipolar Junction Transistor FET and MOSFET Oscillators Operational Amplifier 555 Timer Frequency Response Diodes Feedback Amplifier Power Amplifier
Digital Circuits
Logic Gates Boolean Algebra Analog to Digital and Digital to Analog Converters Sequential Circuits Combinational Circuits Logic Families Number System and Code Convertions Semiconductor Memories
Microprocessors
Instruction Set and Programming with 8085 Pin Details of 8085 and Interfacing with 8085
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
Communications
Analog Communication Systems Digital Communication Systems Random Signals and Noise Fundamentals of Information Theory Noise In Digital Communication
Electromagnetics
Waveguides Antennas Miscellaneous Transmission Lines Maxwell Equations Uniform Plane Waves
General Aptitude
Numerical Ability Logical Reasoning Verbal Ability
Engineering Mathematics
Linear Algebra Calculus Vector Calculus Complex Variable Probability and Statistics Differential Equations Numerical Methods Transform Theory
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