GATE ECE 1988 | GATE ECE Year Wise Previous Years Questions

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GATE ECE 1988

MCQ (More than One Correct Answer)

-0.6

For a normal mode EM wave propagating in a hollow rectangular wave guide

the phase velocity is greater than the group velocity

the phase velocity is greater than velocity of light in free space

the phase velocity is less than the velocity of light in free space

the phase velocity may be either greater than or less than the group velocity

GATE ECE 1988

MCQ (More than One Correct Answer)

-0.6

The electric field E and the magnetic field H of a short dipole antenna satisfy the condition

the r component of E is equal to zero

both r and $$\theta $$ components of H are equal to zero

the $$\theta $$ component of E dominates the r component in the far-field region

the $$\theta $$ and $$\phi $$ components of H are of the same order of magnitude in the near-field region

GATE ECE 1988

Subjective

-0

A rectangular waveguide with cross-section dimensions 5 cm by 3 cm is filled with a dielectric of relative permittivity 3.
(i) Determine the cutoff frequency of the$$T{E_{11}}$$ mode.
(ii) Determine the frequency at which this / mode has an attenuation of $$3\,\pi $$ nepers/m.

GATE ECE 1988

Subjective

-0

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