Sail E0 Webinar

MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 14 of 17 pages
Question 131. The main function of a balanced modulator is to
  1.    Produce 100% modulation
  2.    Suppress carrier signal in order to create a single-sideband or double sideband
  3.    Limit noise picked by a receiver
  4.    Produce balanced modulation of a carrier wave
 Discuss Question
Answer: Option A. -> Produce 100% modulation
Question 132. Full duplex operation permits transmission in both directions at the same time.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 133. In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then
  1.    Amplitude of distant sidebands decreases
  2.    Amplitude of distant sidebands remains constant
  3.    Amplitude of distant sidebands first increases, then decreases
  4.    Amplitude of distant sidebands increases
 Discuss Question
Answer: Option D. -> Amplitude of distant sidebands increases
Question 134. The colour of an object is decided by
  1.    None of these
  2.    The reflected colour
  3.    Reflected colour for opaque object and wavelength transmitted through it for transparent objects
  4.    The wavelength transmitted through it
 Discuss Question
Answer: Option C. -> Reflected colour for opaque object and wavelength transmitted through it for transparent objects
Question 135. In a FM receiver, amplitude limiter
  1.    Reduces the amplitude of signals
  2.    Eliminates any change in amplitude of received FM signals
  3.    None of these
  4.    Amplifiers low frequency signals
 Discuss Question
Answer: Option B. -> Eliminates any change in amplitude of received FM signals
Question 136. Assertion (A): In FM the frequency of the carrier is varied by the modulating voltageReason (R): FM and PM are two forms of angle modulation.
  1.    A is wrong but R is correct
  2.    A is correct but R is wrong
  3.    Both A and R are correct and R is correct explanation of A
  4.    Both A and R are correct but R is not correct explanation of A
 Discuss Question
Answer: Option D. -> Both A and R are correct but R is not correct explanation of A
Question 137. PAM stands for
  1.    Phase Analogue Modulation
  2.    Pulse Analogue Modulation
  3.    Phase Amplitude Modulation
  4.    Pulse Amplitude Modulation
 Discuss Question
Answer: Option D. -> Pulse Amplitude Modulation
Question 138. Which of the following is a digital modulation technique?
  1.    DM
  2.    All
  3.    PCM
  4.    PSK
 Discuss Question
Answer: Option D. -> PSK
Question 139. Which of the following does not cause losses in optical fibre cables?
  1.    Impurities
  2.    Microbending
  3.    Stepped index operation
  4.    Attenuation in glass
 Discuss Question
Answer: Option C. -> Stepped index operation
Question 140. Under ordinary circumstances, impulse noise can be reduced in
  1.    AM only
  2.    Both AM and FM
  3.    FM only
  4.    None of these
 Discuss Question
Answer: Option C. -> FM only

Latest Videos
Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)
Direction Sense Test Part 1 Reasoning (Hindi)
Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE
Cube & Cuboid Part 1 Reasoning (Hindi)
Data Interpretation (DI) Basic Concept Reasoning (Hindi)
Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)
Sail E0 free webinar Webinars
Real Numbers Part 7 Class 10 Maths
Real Numbers Part 1 Class 10 Maths
Polynomials Part 1 Class 10 Maths

Latest Test Papers

DSP Combined 1 Free Revision Test SAIL JO E-0
GPOE / GPA Combined 1 Free Revision Test SAIL JO E-0
BSP Plant Specific Review Test SAIL JO E-0
BSL Combined 1 Free Revision Test SAIL JO E-0
GFM Combined 1 Free Revision Test SAIL JO E-0