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GATE 2021: Electromagnetics Rapid Mini Mock (App update required to attempt this test)

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Question 1

An electromagnetic wave from an underwater source with perpendicular polarization is incident on a water air interface. Find critical angle in degree. Assume μr=1 and εr=81

Question 2

A rectangular waveguide of inner dimension 4cm is operated in mode then minimum operating frequency is …..GHz

Question 3

A tunnel is modelled as an air-filled metallic rectangular waveguide with dimensions a = 8 m and b = 16 m which of the following statement is true about this tunnel

(i) It will not pass a 1.5 MHz AM Signal

(ii) It will pass the 120 MHz FM signal

Question 4

In the given figure, Zin at the generator is

Question 5

A radio station emits 2 power which is received by an antenna . If the antenna is located in the far zone of the station where E = 50 mV/m. its effective area is ____(in m2)

Question 6

At 15GHz, an air –filled 5 x 2 cm waveguide has
V/m
The propagated mode and wave number () are :

Question 7

The flux density in free space is given as:

nC/m2.

Now, calculate the total charge 'Q' (in pC) within the sphere of radius r = 0.4m.

Question 8

The cross section of a waveguide is shown in figure. It has dielectric discontinuity as shown. IF the guide operates at 8GHz in the
dominant mode, The standing wave ratio is

Question 9

A receiving antenna in an airport has a maximum distance of 3m and operates at 100GHz. An aircraft approaching the airport is 0 . 5 Km from the antenna then

Question 10

A rectangular hollow metal waveguide of internal cross-section of 7.366 cm x 3.556 cm carries a 3GHz signal in the TE10 mode . The maximum power handling capability of the waveguide is _________(in MW)

(Assume the maximum permissible electric field inside the waveguide to be 30KV/cm)

Question 11

An EM wave travels in free space with the electric field component Value of are

Question 12

For an air filled waveguide, a TM mode operating at a frequency of 30GHz has

The intrinsic impedance is _____________

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Dec 18ESE & GATE EC