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Department of Electronics and Communication Engineering
Advance Communication System
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Question 1 : The value of modulation index lies between
Option-1 :0 to 1
Option-2 :1 to 2
Option-3 :2 to 5
Option-4 :5 to 10
Question 2 : Thr data format transmitted in case of ISDN system is
Option-1 :B + D
Option-2 :B + 2D
Option-3 :2B + D
Option-4 :2B
Question 3 : ASCII is a
Option-1 :7 - bit code
Option-2 :8 - bit code
Option-3 :8421 code
Option-4 :excess -- 3 code
Question 4 : PSK is basically a method involving
Option-1 :pulse modulation
Option-2 :phase modulation
Option-3 :AM
Option-4 :FM
Question 5 : PPM stands for
Option-1 :plan position modulation
Option-2 :pulse phase modulation
Option-3 :pulse position modulation
Option-4 :pulse plan modulation
Question 6 : Diversity gain depends upon
Option-1 :the number of propagation paths
Option-2 :the method of combination of received signals
Option-3 :both
Option-4 :signal strength of each signal
Question 7 : The beam width of a parabolic dish antenna
Option-1 :decreases with increase in dish diameter
Option-2 :decreases with decrease in dish diameter
Option-3 :is independent of the dish diameter
Option-4 :increases with increase in dish diameter
Question 8 : L.O.S microwave radio relay links normally use a modulation format which is
Option-1 :FDM - FM
Option-2 :FDM - SSB
Option-3 :TDM - PPM
Option-4 :TDM - PCM
Question 9 : Companders are used in relecommunication systems to
Option-1 :compress bandwidth
Option-2 :improve frequency response
Option-3 :improve S/n ratio
Option-4 :reduse quantization noise
Question 10 : Oscillator crystals are made of
Option-1 :silicon
Option-2 :germanium
Option-3 :quartz
Option-4 :carbon
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