Q1:

The maximum usable frequency of an ionospheric layer at 60^o incidence and with 8MHz critical frequency is

Q2:

A Herlzian dipole of length $\lambda /100$location at the origin and fed with a current of i(t) = 0.5 Sin 10⁸ tA. A point P is located at a distance r from the dipole as shown in figure. What will be the magnetic field at P?

Q3:

Find the force on a conductor of length 12m and magnetic flux density 20 units when a current of 0.5A is flowing through it.

Q4:

The capacitance of a material refers to

Q5:

Find the dissipation factor when series resistance is 5 ohm and capacitive resistance is 10 unit.

Q6:

If V = 2x²y + 20z – 4/(x² + y²), find the density at A(6, -2.5, 3) in nC/m².

Q7:

Compute the power consumed by a material with current density 15 units in an area of 100 units. The potential measured across the material is 20V.

Q8:

An infinitely long straight wire of radius ‘a’ carries a uniform current I. The energy stored per unit length in the internal magnetic field will be:

Q9:

B-H curve for a ferromagnetic material is given as B = $2{\mu }_{o}H$. What will be the work done per unit volume in magnetizing the material form zero to a certain value B_o= 2${\mu }_o{H}_o{}^2$?

Q10:

A mass spectrograph is a device for separating charged particles having different masses. Considers 2 particles of some charges Q but different masses m and 2m injected into the region of a uniform field B with a velocity v normal to magnetic field. When the particle will be releasing out of the releasing out of the spectrograph the separation between them will be.

Q11:

Match list I with list II and select the correct answer

List I	List II
a. MMF	1. Conductivity
b. Magnetic flux	2. Electric current
c. Reluctance	3. EMF
d. Permeability	4. Resistance

 

Q12:

Two metal rings 1 and 2, are placed in a uniform magnetic field which is decreasing with times with their planes perpendicular to the field. If the rings are identical except that following statement is correct?

Q13:

In free space, if f_v becomes 0, the Prussian’s equation becomes.

Q14:

A purely resistance load $Z_L$is connected to a 150 $\Omega$lossless transmission line,such that it has a voltage standing wave ratio of 3. The possible value of $Z_L$will be.

Q15:

The phase velocity for the TE mode in an air filled rectangular waveguide is

Q16:

The dominant mode in waveguide is the mode which has

Q17:

In Cartesian coordinates magnetic field is given by B=2/xaz. A square loop of side 2m is lying in xy plane and parallel to the y-axis. Now, the loop Is moving in that plane with a velocity v=2a as shown in the figure.

What will be the circulation of the induced electric field around the loop?

Q18:

Assuming that each loop is stationary and time varying magnetic field B, induces current I, Which of the configurations in the figure are correct?

Q19:

If the loop is pulled downward in the parallel direction to the straight wives, such that the distance between loop and wives is always 3m then induced emf in the loop at any time t will be

Q20:

If the scattering matrix [S] of a two port network is [S] =${\left[\begin{array}{l}0.2<0^{\cdot }\text{ 0}{\text{.9 < 90}}^{\cdot }\\ \text{0}{\text{.9 < 90}}^{\cdot }\text{ 0}\text{.1 < 90}\end{array}\right]}^{\cdot }$,then the network is