Which wave cannot exist inside wave guide

Which wave cannot exist inside wave guide 

(A) TE (B) TM (C) TEM (D) HE
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Which wave cannot exist inside wave guide TEM 

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Last Answer : When a dominant mode wave guide not terminated in its characteristic impedance is excited with a 10 GHZ signal then if d is the distance between two successive minima of the standing wave in the guide then d = 1.5 cm

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When a dipole antenna of 1/8 length has an equivalent total resistance of 1.5 Watt then the efficiency of the

Description : When a dipole antenna of 1/8 length has an equivalent total resistance of 1.5 Watt then the efficiency of the antenna is   (A) 0.89159% (B) 8.9159% (C) 89.159% (D) 891.59%

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A radio receiver is placed at one corner of a table and again placed at some other corner of the same table.

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Last Answer : Earth coverage dish antenna is used in satellite system. It is characterized by the fact that it is sharply focused within a small area of the surface of the earth

A rectangular waveguide is 4.2 cm by 1.85 cm. The cut-off frequency of the dominant mode through this

Description : A rectangular waveguide is 4.2 cm by 1.85 cm. The cut-off frequency of the dominant mode through this waveguide is  (a) 3.57 GHz (b) 3.75 GHz (c) 3.70 MHz (d) 3.57 MHz

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For an antenna to be frequency-independent, it should expand or contract in proportion to the

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The frequency range of FM radio is

Description : The frequency range of FM radio is

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