Digital Communication techniques : UNIT-1

If a signal is defined only at specific instants of time, then it is known as a ________ signal.

• Continuous time

• Analog

• Digital

• Discrete time

If a signal is defined for all instants of time, then it is known as a ________ signal.

• Continuous time

• Analog

• Digital

• Discrete time

Entropy unit is :

• bit / symbol
• symbol / bit
• bit / sec
• sec / bit

Channel capacity unit is :

• bit / symbol
• symbol / bit
• bit / sec
• sec / bit

In PCM
if N = 4, calculate M

• 2
• 4
• 8
• 16

Communication is the process of sending and receiving messages 

• true 
• false

Samples must be taken fast enough in order for high-frequency components to be recognized and adequately represented.

• True

• False

The sample and hold circuit generates _____ waveform.

• PAM

• FM

• PCM

• AM

A minimum sampling rate is ___ times the highest frequency component or upper bandwidth limit of the analog signal as per the sampling theorem.

• 4

• 3

• 2

• Many

Identify the type of signal.

• Discrete time signal

• Continuous time signal