1
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The polarization of a wave with electric field vector $$\overrightarrow E = {E_0}\,{e^{j\left( {\omega t - \beta z} \right)}}\left( {\overrightarrow {{a_x}} + \overrightarrow {{a_y}} } \right)$$ is
A
linear
B
elliptical
C
left hand circular
D
right hand circular
2
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The Maxwell's equation $$\nabla\times\overrightarrow H\;=\;\overrightarrow J\;+\;\frac{\partial\overrightarrow D}{\partial t}$$ is based on
A
Ampere’s law
B
Gauss’ law
C
Faraday’s law
D
Coulomb’s law
3
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
A loop is rotating about the y-axis in a magnetic field $$$\overrightarrow B\;=\;B_0\cos\left(\mathrm{ωt}\;+\;\mathrm\phi\;\right)\;{\overrightarrow a}_x\;\mathrm T .$$$ The voltage in the loop is
A
zero
B
due to rotation only
C
due to transformer action only
D
due to both rotation and transformer action
4
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
For small signal a.c. operation, a practical forward biased diode can be modeled as
A
a resistance and a capacitance in series
B
an ideal diode and resistance in parallel
C
a resistance and an ideal diode in series
D
a resistance