This type of cable is an unbalanced system:

Question

Options

• AUnshielded twisted-pair (UTP)
• BShielded twisted-pair (STP)
• CScreened twisted-pair (ScTP)
• DCoaxial

• A
  8% (3)
• B
  3% (1)
• C
  18% (7)
• D
  71% (27)

Explanation

Coaxial cable is an unbalanced transmission system because it consists of a center conductor surrounded by a grounded outer shield. In an unbalanced system, one conductor (the shield) is held at ground potential while the other (the center conductor) carries the signal - the two conductors are NOT electrically symmetrical with respect to ground. By contrast, twisted-pair cables - whether UTP (A), STP (B), or ScTP (C) - are balanced systems: both conductors carry equal-amplitude, opposite-polarity signals with identical impedance to ground. This balanced configuration provides common-mode noise rejection (the noise induced on both conductors cancels out), which is why twisted-pair is preferred in noisy environments. Coaxial cable achieves shielding through its outer conductor, not through signal balancing.

No community discussion yet for this question.