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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 :
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
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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