1
GATE ECE 1987
Subjective
+8
-0
An electric field is given by $$\overrightarrow E = \overrightarrow a {}_x\,{\rm A}\,\,\sin \,\beta ySin\,\,\omega t$$ is present in a charge free medium infinite in extent

(a) Determine the associated magnetic field.
(b) What type of wave does the above field represent?

2
GATE ECE 1987
MCQ (More than One Correct Answer)
+2
-0
The cut-off frequency of a waveguide depends upon
A
The dimensions of the waveguide
B
The dielectric property of the medium in the waveguide
C
The characteristic impedance of the waveguide
D
The transverse and axial components of the fields
3
GATE ECE 1987
Subjective
+4
-0
A thin dipole antenna is $$\left( {\lambda /15} \right)$$ long, where $$\lambda $$ is the voperating wavelength. If the dipole has a loss resistance of $$1.5$$ ohm determine its
(i) radiation resistance and
(ii) terminal resistance
4
GATE ECE 1987
MCQ (Single Correct Answer)
+2
-0.6
The diffusion capacitance of a P-N junction
A
Decreases with increasing current and increasing temperature
B
Decreases with decreasing current and increasing temperature
C
Increases with increasing current and increasing temperature
D
Does not depend on current and temperature
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