11 When the angle of incidence is __ _____ the critical angle, the light beam bends along the interface. A) more than B) less than C) equal to D) none of the above 12 Signals with a frequency below 2 MHz use _______ propagation. A) ground B) sky C) line-of-sight D) none of the above 13 Signals with a frequency between 2 MHz and 30 MHz use _ _____ propagation. A) ground B) sky C) line-of-sight D) none of the above 14 Signals with a frequency above 30 MHz use _______propagation. A) ground B) sky C) line-of-sight D) none of the above 15 A parabolic dish antenna is a(n) _ ______ antenna. A) omnidirectional B) bidirectional C) unidirectional D) horn 16 A(n) _____ medium provides a physical conduit from one device to another. A) guided B) unguided C) either (a) or (b) D) none of the above 17 ________ cable consists of two insulated copper wires twisted together. A) Coaxial B) Fiber-optic C) Twisted-pair D) none of the above 18 _______ cable is used for voice and data communications. A) Coaxial B) Fiber-optic C) Twisted-pair D) none of the above 19 __________ consists of a central conductor and a shield. A) Coaxial B) Fiber-optic C) Twisted-pair D) none of the above 20 _____ cable can carry signals of higher frequency ranges than ___ __ cable. A) Twisted-pair; fiber-optic B) Coaxial; fiber-optic C) Coaxial; twisted-pair D) none of the above
Posted on: Mon, 02 Dec 2013 01:16:37 +0000
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