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# One Shot Marathon Series Test - EMFT (ECE)

Attempt now to get your rank among 31 students!

Question 1

The electric field component of a time harmonic plane EM wave travelling in a non-magnetic lossless dielectric medium has amplitude of 2 V/m. If the relative permittivity of the medium is 4, the magnitude of the time-average power density vector (in W/m2) is?

Question 2

In transmission on line (r = 1) the electric field intensity is sin(108 t – 4z)aV/m displacement current density magnitude will be If p =1

Question 3

The material having relative permittivity is 14 and the conductivity is. It is operating at microwave frequency of, and then this material will behave as

Question 4

A telephone line has the following below parameters. If the line is operating at a frequency of, then the phase velocity on the line is?

Question 5

In free space the electric field and magnetic field are given by and. The value of and such that the field will satisfy the Maxwell’s equations are respectively.

Question 6

A square loop of 2 m side is placed in xy – plane with its centre at the origin and sides along the coordinate axes. If the magnetic flux density in the region is given by,

Wb/m2

The emf included in the loop at t = 10 sec will be _________ mV.

Question 7

In a material the magnetic field intensity is H = 1400 A/m when magnetic flux density B = 2 Wb/m2. When the H is reduced to 700 A/m at B = 1.4 Wb/m2, the change in permeability is __________.

Question 8

For the medium with and and then value of β in rad/m will be:

Question 9

The energy stored in (mJ) in a magnetic field of toroidal iron ring (μ2 = 800) 20 cm, mean radius and a radius for the winding of 2 cm, wound with 1000 turns of wire carrying a current of 2.5 A is

Question 10Multiple Correct Options

Determine the electric field intensity at a distance of 10 km from an antenna having a directive gain of 5 dB and radiating a total power of 20 kW

Question 11

A circular cross section conductor of radius 1.5 mm carries a current Ic = 5.5 sin(4 * sin 1010 t) μA. What is the amplitude of the displacement current density if σ = 35 MS/m and ϵr = 1

Question 12

At the surface of a perfect conductor

Question 13

For what value of k, the following pair of fields satisfies Maxwell’s equation in a region where σ = 0 and ρv = 0.

and

μ = 0.25 H/m and ϵ = 0.01 F/m

Question 14

The correct statement among the following is

Question 15

A uniform plane wave in region-1 is incident on the planner boundary separating regions –1 and 2. Considering the medium to be a non-magnetic medium and σ1 = σ2 = 0. If the ratio of is 8.21, then the power transmitted in region-2 is

Question 16

A perfectly conducting filament containing a small 500 Ω resistor is formed into a square as shown in figure. If the magnetic flux density , then the rms value of induced emf in the loop is________ volt.

Question 17

A medium characterized by ϵr = 3, μr = 1, σ = 0.2 S/M

The phase angle by which Electric field lead the magnetic field at 200 MHz in degree is______

Question 18

The electric field component of a plane wave travelling in a lossy medium is.

The loss targent of the medium is?

Question 19

For an electric field E = Eo sinωt. What is the phase difference (in degrees) between the conduction current and displacement current ?

Question 20

Consider a material with with relative permeability Then at what frequency (in Hz) the depth of penetration will be 3 mm.

Question 21

Two lines are Connected as shown

If ZB = 50Ω, find the value of ZA such that there will be no reflected wave is ________ Ω

Question 22

A transmission line having characteristic impedance ZO = 50Ω is operating at 200 MHz is terminated by series combination of a 75 Ω resistor and a variable capacitor. The value of capacitor ‘C’ that will produce SWR of 6 on the line is _________ (PF)

Question 23

The current standing wave pattern of a lossless transmission line with Zo = 200 Ω and a resistive load is shown as

The value of load resistance is __________Ω

Question 24Multiple Correct Options

The surfaces ρ = 3 and 5, ϕ = 100° and 130° and z = 3 and 4.5. Find the volume enclosed, total area of the enclosing surface and total length of the twelve edges of the surface.

Question 25Multiple Correct Options

A transmission line has a characteristic impedance of 50 Ω and is terminated by a load impedance of (75 – j50) Ω. Calculate reflection coefficient (ρ) and standing wave ratio (S)?
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