Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Tests  >  Test: Electromagnetic Field Theory - 3 - Electronics and Communication Engineering (ECE) MCQ

Test: Electromagnetic Field Theory - 3 - Electronics and Communication Engineering (ECE) MCQ


Test Description

25 Questions MCQ Test - Test: Electromagnetic Field Theory - 3

Test: Electromagnetic Field Theory - 3 for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Test: Electromagnetic Field Theory - 3 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Electromagnetic Field Theory - 3 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electromagnetic Field Theory - 3 below.
Solutions of Test: Electromagnetic Field Theory - 3 questions in English are available as part of our course for Electronics and Communication Engineering (ECE) & Test: Electromagnetic Field Theory - 3 solutions in Hindi for Electronics and Communication Engineering (ECE) course. Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free. Attempt Test: Electromagnetic Field Theory - 3 | 25 questions in 25 minutes | Mock test for Electronics and Communication Engineering (ECE) preparation | Free important questions MCQ to study for Electronics and Communication Engineering (ECE) Exam | Download free PDF with solutions
Test: Electromagnetic Field Theory - 3 - Question 1

A material has conductivity of 10-2 mho/m and a relative permittivity of 4. The frequency at which conduction current in the medium is equal to displacement current is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 1

Conduction current density J = wD

J = σE σE = ωD = 2p fD

Test: Electromagnetic Field Theory - 3 - Question 2

A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 2

Pradiated = Gain of Antenna x Input power = G.I

10 log1010 . 1 10 watt.

1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Electromagnetic Field Theory - 3 - Question 3

An end fire array consisting of several half-wave lengths of directive gain 40, then find the width of major lobe

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 3

.

Test: Electromagnetic Field Theory - 3 - Question 4

A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 4

Preflected = |δ|2 Pincident

|δ|2 = 0.25 .

Test: Electromagnetic Field Theory - 3 - Question 5

Poynting vector is associated with which of the following?

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 5

P = E x H

Test: Electromagnetic Field Theory - 3 - Question 6

A 10 GHz signal propagates in a waveguide with a phase velocity of 4 x 108 m/s. If the signal produces standing wave in the guide, then the distance between successive minimal will be

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 6

f = 10 GHz, v = 4 x 108 m/sec,

.

Test: Electromagnetic Field Theory - 3 - Question 7

The incidence from dielectric medium 1 (ε1) into dielectric medium 2 (ε2), Brewster angle θB and the corresponding angle of transmission θt for will be respectively

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 7

Brewster angle θ = tan-1

Test: Electromagnetic Field Theory - 3 - Question 8

A medium of relative permittivity εr2 = 2 forms an interface with free space. A point source of EM energy is located in the medium at a depth of 1 meter from the interface. Due to the total internal reflection, the transmitted beam has a circular cross-section over the interface. The area of the beam cross section at the interface is given by

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 8

Test: Electromagnetic Field Theory - 3 - Question 9

A transmission line of characteristic impedance z0 = 50 Ω. Phase Velocity = 2 x 108 m/sec, and length l = 1 m is terminated by a load z1 = (30 - j 40) ohms. The input impedance of the line for a frequency of 100 MHz will be

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 9

.

Test: Electromagnetic Field Theory - 3 - Question 10

A circular waveguide carries TE11 mode whose radial electric-field is given by
Er = E 0J1 (r) sin φ V/m
where 'r' is the radial distance in cm, from the waveguide axis. The cut-off wavelength of the mode is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 10

.

Test: Electromagnetic Field Theory - 3 - Question 11

A uniform plane wave travelling in air is incident on the plane boundary between air and another dielectric medium with εr = 4. The reflection coefficient for the normal incidence is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 11

Reflection coefficient

.

Test: Electromagnetic Field Theory - 3 - Question 12

A transmission line has characteristics impedance of (75 + j 0.01) Ω and is terminated in a load impedance of (70 + j 50) Ω. The transmission coefficient will be

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 12

Transmission coefficient .

Test: Electromagnetic Field Theory - 3 - Question 13

Maximum effective aperture of an antenna which is operating at a wavelength of 3 meters and has a directivity of 100

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 13

.

Test: Electromagnetic Field Theory - 3 - Question 14

The distance between maxima and minima of a standing wave is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 14

Test: Electromagnetic Field Theory - 3 - Question 15

A TV. transmitting aerial is fixed on top of a 150 metre tower located on a mountain 1200 m height. The range of transmitter is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 15

1 = 1.44[ht + ht]

Test: Electromagnetic Field Theory - 3 - Question 16

A vertical wire of 1 meter length carries a current of 1 A at 10 MHz. The total radiated power is nearly

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 16

P = I2 . R (1)2 . 73 73 watt.

Here, vertical wire will be considered as dipole.

Test: Electromagnetic Field Theory - 3 - Question 17

The length of half-wave antenna is at 30 MHz

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 17

.

Test: Electromagnetic Field Theory - 3 - Question 18

For a 400 kHz transmission line having L = 0.5 mH/km, C = 0.08 mF and negligible R and G, the characteristic impedance will be

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 18

f = 400 kHz, L = 0.5 mH, C = 0.08 mF

.

Test: Electromagnetic Field Theory - 3 - Question 19

Which one of the following statement is not a correct for a plane wave with = 0.5e-0.1x cos (106t - 2x)az A/m?

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 19

P = E x H P = EH, θ = 90º

η = 120p = 377 Ω.

Test: Electromagnetic Field Theory - 3 - Question 20

Beamwidth (between first nulls) will be for an antenna at 3 MHz with directivity of 100

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 20

.

Test: Electromagnetic Field Theory - 3 - Question 21

If and

the time average Poynting vector is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 21

Test: Electromagnetic Field Theory - 3 - Question 22

Calculate the wave number in waveguide having dimensions 4 x 2 cm at 3 GHz

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 22

.

Test: Electromagnetic Field Theory - 3 - Question 23

For a transmission line with homogeneous dielectric the capacitance per unit length is 'c', the relative permittivity of the dielectric is 'εr' and velocity of light in free space is 'v' the characteristic impedance z0 is equal to

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 23

.

Test: Electromagnetic Field Theory - 3 - Question 24

The I/P impedance of a short circuited quarter wave long transmission line is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 24

Because for irrotational, ∇ x = 0.

Test: Electromagnetic Field Theory - 3 - Question 25

A dipole antenna of λ/8 length has an equivalent total loss resistance of 1.5 Ω. The efficiency of the antenna is

Detailed Solution for Test: Electromagnetic Field Theory - 3 - Question 25

Rr = 80p2 , Re = 1.5 Ω,

.

Information about Test: Electromagnetic Field Theory - 3 Page
In this test you can find the Exam questions for Test: Electromagnetic Field Theory - 3 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Electromagnetic Field Theory - 3, EduRev gives you an ample number of Online tests for practice

Top Courses for Electronics and Communication Engineering (ECE)

Download as PDF

Top Courses for Electronics and Communication Engineering (ECE)