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Microwave Waveguides – 1 – 3

11. When the electric field in a waveguide is perpendicular to the direction of wave propagation, the mode is said to be :

(a) vertical polarization
(b) horizontal polarization
(c) transverse electric
(d) transverse magnetic

ANSWER

EXPLANATION

12. The main advantage of the two hole directional coupler is :

(a) Low directional coupling
(b) Poor directivity
(c) High SWR
(d) Narrow bandwidth

ANSWER

EXPLANATION

13. Materials generally preferred for wave guides are :

(a) Brass and aluminium
(b) Cast iron and steel
(c) Non-metallic solids including plastics
(d) All of the above

ANSWER

EXPLANATION

14. In a waveguide the energy is propagated by :

(a) Voltage different
(b) Current Variations
(c) Varying magnetic fields
(d) Varying magnetic and electric fields

ANSWER

EXPLANATION

15. The skin effect causes current to flow :

(a) in the centre of the conductor
(b) Near the surface of the conductor
(c) Through central care of the conductor
(d) Uniformly through the conductor

ANSWER

EXPLANATION

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