GATE ECE 1991 | Antennas Question 46 | Electromagnetics

GATE ECE 1991

MCQ (Single Correct Answer)

-0.6

In a board side array of 20 isotropic radiators, equally spaced at a distance of $$\lambda /2$$, the veam width between first nulls is

51.3 degrees

11.46 degrees

22.9 degrees

102.6 degrees

GATE ECE 1990

MCQ (Single Correct Answer)

-0.6

Two isotropic antennas are separated by a distance of two wavelengths. If both the antennas are fed with currents of equal phase and magnitude, the number of lobes in the radiation pattern in the horizontal plane are

GATE ECE 1989

MCQ (Single Correct Answer)

-0.6

In the case of ground wave propagation, at far-off distances from the transmitting tower antenna, the Poynting vector is

in the truly horizontal direction

essentially horizontal but for a small downward component

essentially horizontal but for a small upward component

directed upward at an angle determined by the "effective height" of the transmitting tower antenna.

GATE ECE 1988

MCQ (More than One Correct Answer)

-0

The electric field E and the magnetic field H of a short dipole antenna satisfy the condition

the r component of E is equal to zero

both r and $$\theta $$ components of H are equal to zero

the $$\theta $$ component of E dominates the r component in the far-field region

the $$\theta $$ and $$\phi $$ components of H are of the same order of magnitude in the near-field region

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