16. A device used for coupling microwave energy is known as :
(a) Transmitter
(b) Resonator
(c) Waveguide
(d) Loop
17. A quarter-wave sub shorted at the end has high impendance :
(a) At shorted end
(b) λ 4
(c) λ 2
(d) At the centre
18. The angle between electric and magnetic fields in a waveguide is :
(a) 900
(b) 00
(c) 1800
(d) 3600
19. The dominant mode for rectangular waveguide is :
(a) TEM
(b) TE10
(c) TE1r
(d) TM11
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