Electronics and Communication Engineering - Electromagnetic Field Theory

1. 

Which of the following laws of electromagnetic theory is associated with the force experienced by two loops of a wire carrying currents?

A. Maxwell's law
B. Coulomb's law
C. Ampere's law
D. Laplace's law

Answer: Option C

Explanation:

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2. 

The intrinsic impedance of free space

A. increases with increase of frequency
B. decreases with increase of frequency
C. is independent of frequency
D. none

Answer: Option C

Explanation:

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3. 

To couple a coaxial line to a parallel to wire line it is best to use a

A. slotted line
B. balun
C. directional coupler
D. quarter wave transformer

Answer: Option B

Explanation:

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4. 

The shunt admittance of a transmission line is given by

A. γ = R + jωL
B. γ = R - jωL
C. γ = G + jωC
D. γ = jωGC

Answer: Option C

Explanation:

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5. 

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 non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will

A. decrease to finite non-zero value
B. remain the same
C. increase
D. decrease to zero

Answer: Option B

Explanation:

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