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Test: Electromagnetic & Analog Communications - 1 - Electronics and Communication Engineering (ECE) MCQ


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15 Questions MCQ Test GATE ECE (Electronics) 2024 Mock Test Series - Test: Electromagnetic & Analog Communications - 1

Test: Electromagnetic & Analog Communications - 1 for Electronics and Communication Engineering (ECE) 2024 is part of GATE ECE (Electronics) 2024 Mock Test Series preparation. The Test: Electromagnetic & Analog Communications - 1 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Electromagnetic & Analog Communications - 1 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 & Analog Communications - 1 below.
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Test: Electromagnetic & Analog Communications - 1 - Question 1

Arrange in ascending order of cut off

frequency (fc) of the waveguides in the following modes as

Test: Electromagnetic & Analog Communications - 1 - Question 2

An AC voltage source v = Vo sin cot is

connected across a parallel plate capacitor

'C'. The displacement current in the capacitor is equal to

Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 2

Conduction current inThe connecting wires

= i

= CωVo cos ωt   .............. (I)

For a parallel plate capacitor of area 'A and plate separation 'd',

       ......................(ii)

 

Electric field (E) = 

Also,              D = Electric flux density

Now, displacement current (id)

= CωVo cos ωt   ............  (iii)

From equation (i) and (iii) we have

i = id 

Test: Electromagnetic & Analog Communications - 1 - Question 3

A plane wave is characterized by The wave is

Test: Electromagnetic & Analog Communications - 1 - Question 4

Skin depth at a frequency of 1.6 MHz inaluminium, σ = 38.2, μr = 1.

Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 4

Skin depth

= 64.4 mm

Test: Electromagnetic & Analog Communications - 1 - Question 5

An uniform sinusoidal plane wave in air hasthe following expression for electric field The frequency of operation will be

Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 5

General expression,

Now, frequency =

Test: Electromagnetic & Analog Communications - 1 - Question 6

A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non­magnetic and non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will

Test: Electromagnetic & Analog Communications - 1 - Question 7

A dipole antenna of λ/8 length has anequivalent total loss resistance of 1.5ΩThe efficiency of the antenna is:

Test: Electromagnetic & Analog Communications - 1 - Question 8

Match List-I (Laws) with List-II (Applica- tions) and select the correct answer:

List-I

A. Ampere's law

B. Biot's law

C. Coulomb's law

D. Gauss's law

List-II

To find the

  1. force on a charge

  2. force due to a current carrying

  3. electric flux density at a point

  4. magnetic flux density at a point

*Answer can only contain numeric values
Test: Electromagnetic & Analog Communications - 1 - Question 9

A signal m(t) is band limited upto 20 kHz is sampled at `fs' kHz. An ideal LPF having cut off frequency 57 kHz is used to reconstruct the m(t). The minimum value of `fs' required to reconstruct m(t) without distortion is,__________   kHz


Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 9

For the distortion less reconstruction of m(t)

signal,

 fs - fm ≥ 57 kHz

⇒   fs ≥ 57 + fin
⇒   fs  ≥  77 kHz

Test: Electromagnetic & Analog Communications - 1 - Question 10

An AM transmitter is to deliver a total power of 100 W to an antenna. The percentage modulation is to be 100%. The power contained in each sideband is

Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 10

Test: Electromagnetic & Analog Communications - 1 - Question 11

Which one of the following sequence is correct regarding bandwidth (BW) of various analog modulated system?

Test: Electromagnetic & Analog Communications - 1 - Question 12

 The nyquist sampling rate for the signal s(t) = 20 cos(50πt) . cos2(150πt) is,

Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 12

 

The maximum frequency component will be

= 150 + 25

= 175 Hz

∴ Nyquist sampling rate

= fs

= 2 fm

= 2 x 175Hz

= 350 samples/sec

 

*Answer can only contain numeric values
Test: Electromagnetic & Analog Communications - 1 - Question 13

The modulation index of an FM signal having a carrier swing of 100 kHz and modulating frequency of 8 kHz is 


Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 13

∴ Carrier swing = 2 x Δf 

⇒  Δf = 50 kHz

Also, modulation index

∴  

= 6.25

Test: Electromagnetic & Analog Communications - 1 - Question 14

For the generation of an AM signal we have m(t) = cos (4π x 104 t) and c(t) = 5 cos(2π x 106 t) where m(t) represents message signal and c(t) represents carrier signal then what would be the relation between total power (PT) and power contained in one of its side band (Ps) if the modulation index is 0.5?

Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 14

∴ 

Let 

 

⇒ .       .......(ii)

∴ From equation (ii)

⇒ PT = 18 Ps

Test: Electromagnetic & Analog Communications - 1 - Question 15

Percentage modulation of an AM wave having a power content of 8 kW at carrier frequency and 2 kW in each of its bands is given by

Detailed Solution for Test: Electromagnetic & Analog Communications - 1 - Question 15

Given That

⇒ m= 1

∴ % modulation = 100%

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