Electromagnetic Field Theory Test - Online Electronics and Communication Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Marks : 2/20

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

140°

70°

210°

60°

[#]

In case of static electric field Maxwell's divergence equation states that:

∇ .

= 1/r

∇ .

= r/ε₀

∇ .

= εr

∇ .

= r

[#]

The electric flux and field intensity inside a conducting sphere is

minimum

maximum

uniform

zero

[#]

For a plane good conductor, skin depth varies

directly as square root of permeability

directly as square root of frequency

inversely as permittivity

inversely as square root of conductivity

[#]

Which one is correct option?

TEM mode exist in free space of infinite boundary

TEM mode exist in two conductor pattern system for finite-boundary

TEM mode exist in waveguide only

Both (a) and (b)

[#]

For broadside array, maxima will be obtain at

90°, 270°

180°

45°

at any angle

[#]

The phase velocity in a transmission line is

v = LC

[#]

The length of a λ/2 antenna in feet is given by the relation

[#]

D-layer extends approximately from

50 to 90 km

20 to 50 km

90 to 110 km

up to 50 km

[#]

10.

For a hollow waveguide, the axial current must necessarily be

combination of conduction and displacement current

conduction current only

time varying conduction current and displacement current

displacement current only

[#]

11.

What is the characteristic impedance Z₀ of a line having R, inductance L, capacitance C and conductance G?

[#]

12.

Antenna beamwidth is

measure of directivity

measure of angle

measure of radiation pattern

measure of power pattern

[#]

13.

Which of the following is high frequency transmission line?

An impedance transformer

Frequency compensator

Flying resistor

None of the above

[#]

14.

The dimension of flux density is

MT^-1Q^-1

MT^-2

MT¹Q¹

MT^-1Q^-2

[#]

15.

T.V. broadcasting based on

line of sight communication

ionospheric propagation

ground wave

medium wave

[#]

16.

Microwave signals follow the curvature of the earth and the phenomenon

tropospheric scatter

faraday effect

duct propagation

none

[#]

17.

Frequencies in the UHF range propagate by means of

space wave

surface waves

sky waves

ground waves

[#]

18.

The discone antenna is

a useful direction finding antenna

used as a radar receiving antenna

useful as a UHF receiving antenna

circular polarized like other circularly antenna

[#]

19.

Poynting vector signifies which of the following?

Power density vector producing electrostatic field

Power density vector producing electromagnetic field

Current density vector producing electrostatic field

Current density vector producing electromagnetic field

[#]

20.

An antenna is considered to be in free space where its height above the ground is

2λ

less than 3λ

more than 5λ

[#]

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Online Electronics and Communication Engineering Test - Electromagnetic Field Theory Test

Marks : 2/20

Test Review : View answers and explanation for this test.

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