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Question 179Asked in CIL MT Systems, 26 Mar 2017 (12:30 PM)

State TRUE or FALSE for the following. (i) A sine wave with a phase of 180° starts at time 0 with a zero amplitude. The amplitude is decreasing.

State TRUE or FALSE for the following. (i) A sine wave with a phase of 180° starts at time 0 with a zero amplitude. The amplitude is decreasing. (ii) If a signal changes instantaneously, its frequency is zero. (iii) In bipolar encoding, we use three voltage levels: positive, negative and zero. (iv) Infrared signals can be used for short-range communication in a closed area using ground propagation.
  1. A(i) TRUE, (ii) FALSE, (iii) TRUE, (iv) FALSE
  2. B(i) TRUE, (ii) TRUE, (iii) TRUE, (iv) FALSE
  3. C(i) FALSE, (ii) TRUE, (iii) FALSE, (iv) FALSE
  4. D(i) TRUE, (ii) TRUE, (iii) FALSE, (iv) FALSE
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Correct answer: (A) (i) TRUE, (ii) FALSE, (iii) TRUE, (iv) FALSE

From CIL MT Systems PYQ, 26 Mar 2017 (12:30 PM)

This is question 179 of CIL MT Systems PYQ, 26 Mar 2017 (12:30 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.