What is the primary advantage of digital signals over analog signals in communication systems?

The ease with which digital signals are regenerative.

Which of the following components introduces redundancy in the binary information sequence? A) Source Encoder B) Channel Encoder C) Digital Modulator D) Source Decoder

B) Channel Encoder

True or False: Digital circuits are more subject to distortion and interference than analog circuits.

False. Digital circuits are less subject to distortion and interference than analog circuits.

Fill in the blank: The process of efficiently converting the output of an analog or digital source into a sequence of binary digits is called ______.

Source encoding or data compression

Riddle: I transform a continuous signal into a discrete one, quantizing samples into digital code. What am I?

Pulse Code Modulation (PCM)

What is the maximum quantization error for a uniform quantizer with step size δ?

± δ/2

Which companding technique uses a logarithmic compression curve? A) A-law B) μ-law C) Linear D) Exponential

B) μ-law

True or False: Differential Pulse Code Modulation (DPCM) does not use prediction of signal samples.

False. DPCM uses prediction of the samples of the signal.

Fill in the blank: The bandwidth requirement for Pulse Code Modulation is minimum ______ and maximum ______.

Rb/2; Rb

What is the primary function of a digital demodulator in a communication system?

To process the channel-corrupted transmitted waveform and reduce it to a sequence of numbers representing the transmitted data symbols.

Which of the following modulation techniques varies the width of the pulse? A) PAM B) PWM C) PPM D) PCM

B) PWM

True or False: In Pulse Amplitude Modulation (PAM), the amplitude of the pulse carries the message information of the baseband signal.

True.

Fill in the blank: A uniform quantizer has a step size that remains ______ throughout the input range.

The same

Riddle: I am a technique that allows multiple signals to share the same channel, increasing efficiency. What am I?

Multiplexing

What is the primary purpose of the RF amplifier in a radio receiver?

To amplify the received signal and remove any attenuation.

Which type of receiver uses frequency mixing to convert frequencies to an intermediate frequency? A) Direct conversion receiver B) Superheterodyne receiver C) Regenerative receiver D) Tuned radio frequency receiver

B) Superheterodyne receiver

True or False: The Automatic Gain Control (AGC) is used to maintain a constant gain regardless of the input signal strength.

True.

Fill in the blank: The process of sending multiple signals over the same communication channel is known as ______.

Multiplexing

What is the role of the modulator in a radio transmitter?

To combine the baseband signal and the carrier signal through modulation.

Which multiplexing technique uses time slots to separate signals? A) FDM B) TDM C) CDM D) WDM

B) TDM

Riddle: I carry information through space, transforming electrical energy into electromagnetic waves. What am I?

Antenna

What is the main advantage of Time Division Multiplexing (TDM) over Frequency Division Multiplexing (FDM)?

Effective utilization of bandwidth.

Fill in the blank: The process of converting one form of energy to another in a transducer is called ______.

Transduction

True or False: Passive transducers require an external power source to operate.

False. Passive transducers do not require an external power source.

Which type of modulation allows two independent data streams to be transmitted using orthogonal polarization states? A) WDM B) PDM C) FDM D) TDM

B) PDM