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Electromagnetic Field Theory
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Q101

Open question
A medium of relative permittivity εr2 = 2 form an interface with free-space. A point source of electromagnetic energy is located in the medium at depth of 1 meter from the interface. Due to the total internal reflection, the transmitted beam has a circular cross-section over the interface. The area of the beam cross-section at the interface is given by

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Q102

Open question
Two ceramic capacitors have the following parameters. One has capacitance C1 and ceramic thickness d1. The other has capacitance C2 and ceramic thickness d2. When the two are connected in parallel, the combination has a capacitance of

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Q103

Open question
The electric field component of a uniform plane wave propagating in a lossless magnetic dielectric medium is given by       If η0 represents the intrinsic impedance of the free space, the corresponding magnetic field component is given by

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Q104

Open question
A small current carrying circular loop lies on a vertical plane. P is a point of observation on the orthogonal vertical plane passing through the centre of the loop and θ is the angle between O and OP as shown in the given figure. The θ component of the H-field will vary as:
Electromagnetic Field Theory mcq question image

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Q105

Open question
Equation of the plane passing through the point   and perpendicular to the vector   is

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Q106

Open question
The divergence of the magnetic flux density B is given as:

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Q107

Open question
Consider the following statements regarding a plane wave propagating through free space:
The direction of field
1. 'E' is perpendicular to the direction of propagation
2. 'H' is perpendicular to the direction of propagation
3. 'E' is perpendicular to the direction of field 'H'
Which of these statements are correct?

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Q108

Open question
A transmission line has characteristic impedance of 500 Ω. It has been terminated in a 200 Ω load. If the load is dissipating a continuous power of 100 W, its reflection coefficient is

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Q109

Open question
Which of the following statement is correct?

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Q110

Open question
Consider the following statements regarding impedance matching:
1. When the line is terminated in an impedance other than its characteristic impedance, reflection will occur and there will be standing waves of voltage and current along the line which may be very large if there is considerable mismatch.
2. The single-stub device has the advantage that it will match any load.
3. The double stub has the disadvantage that the line length needs to be adjustable.
Which of the above statements are correct?

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Q111

Open question
In a hundred-turn coil, if the flux through each turn is (t3 - 2t) mWb, the magnitude of the induced emf in the coil at a time of 4s is:

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Q112

Open question
A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected?

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Q113

Open question
Skin depth at 2 GHz for a gold conductor with σ = 4.55 × 107 S/m is 1.5 µm. Skin depth (in µm) at 8 GHz & 18 GHz is:

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Q114

Open question
The value of ∇.A; where     at a point (2, -2, 2) is:

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Q115

Open question
Which one of the following is caused by reflection from stratified atmosphere or from the surface or land conditions along the path?

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Q116

Open question
Polarization of dielectric materials results in

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Q117

Open question
The property of the material which oppose the creation of magnetic flux in it is called

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Q118

Open question
The capacitor is made with a polymeric dielectric having an εr of 2.26 and a dielectric breakdown strength of 50 KV/cm. The permittivity of free space is 8.85 pF/m. If the rectangular plates of the capacitor have a width of 20 cm and a length of 40 cm, then the maximum electric charge in the capacitor is

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Q119

Open question
If R = Earth's radius, h = orbit height, β = coverage angle, and θ = minimum elevation angle, then which one of the following relations is correct?

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Q120

Open question
The value of the determinant \left| {\begin{array}{*{20}{c}} {\cos \theta }&\theta &{\sin \theta } \\ 0&1&0 \\ { - \sin \theta }&0&{\cos \theta } \end{array}} \right|    is

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