Electromagnetic Field Thoery - ECE Questions and Answers

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The current distribution along a travelling wave antenna can be written in the form

f(z) = f₀e^-jβ_z

f(z) = f₀ sin β_z

f(z) = f₀

f(z) = f₀ cos (ωt - β_z)

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The characteristic impedance of loss less transmission line is

L/R

L/C

1/LC

C/L

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

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

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Industrial heating furnaces such as arc and induction furnaces operate on __________ power factor

low leading

low lagging

high leading

very low lagging

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

The magnetic field due to current I equals

I/2 pr

I/4 pr

I²/2 pr

I²/4 pr

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

VLF is generally used for

telegraphy

satellite communication

instrument landing system

all of the above

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

In electromagnetic wave polarization is caused by

refraction

reflection

longitudinal nature of electromagnetic waves

transverse nature of electromagnetic waves

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

In a rectangular waveguide if operating frequency is greater than cut off frequency then propagation constant is

purely real

purely imaginary

equal to unit

a complex number

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL
Share as Image
As Image

Isotropic radiator is one that radiates energy

uniformly in all direction

inside a hollow sphere

in a well defined isotropic direction

none of the above