Question 1

In angle modulation, signal to noise ratio before detection is a function of_________

Accepted Answer

A) modulation index 
B) input signal to noise ratio 
C) maximum frequency of the message 
D) if filter bandwidth 
A) modulation index 
B) input signal to noise ratio 
C) maximum frequency of the message 
D) if filter bandwidth

Question 2

Which of the following is not an advantage of digital modulation?

Accepted Answer

A) greater noise immunity 
B) greater security 
C) easier multiplexing 
D) less bandwidth requirement 
A) greater noise immunity 
B) greater security 
C) easier multiplexing 
D) less bandwidth requirement

Question 3

FFSR in AM systems stands for_________

Accepted Answer

A) feedforward signal regeneration 
B) feedbackward signal regeneration 
C) feedbackward system restoration 
D) feedforward system restoration 
A) feedforward signal regeneration 
B) feedbackward signal regeneration 
C) feedbackward system restoration 
D) feedforward system restoration

Question 4

A percentage of modulation greater than

Accepted Answer

A) 10% 
B) 25% 
C) 50% 
D) 100% 
A) 10% 
B) 25% 
C) 50% 
D) 100%

Question 5

Quantization is a_________process.

Accepted Answer

A) few to few mapping 
B) few to many mapping 
C) many to few mapping 
D) many to many mapping 
A) few to few mapping 
B) few to many mapping 
C) many to few mapping 
D) many to many mapping

Question 6

Non coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiver.

Accepted Answer

A) True 
 B)False

Question 7

A narrow band noise can exist in

Accepted Answer

A) am only 
B) pcm only 
C) fm only 
D) am and fm both 
A) am only 
B) pcm only 
C) fm only 
D) am and fm both

Question 8

AM demodulation technique can be divided into_________and_________demodulation.

Accepted Answer

A) direct, indirect 
B) slope detector, zero crossing 
C) coherent, noncoherent 
D) quadrature detection, coherent detection 
A) direct, indirect 
B) slope detector, zero crossing 
C) coherent, noncoherent 
D) quadrature detection, coherent detection

Question 9

LCD uses_________

Accepted Answer

A) sematic crystals 
B) twisted nematic crystals 
C) nematic crystals 
D) cholesteric crystals 
A) sematic crystals 
B) twisted nematic crystals 
C) nematic crystals 
D) cholesteric crystals

Question 10

The antenna current is 10A. Find the percentage of modulation when the antenna current increases to 10.4A?

Accepted Answer

A) 50% 
B) 30% 
C) 28.5% 
D) 23% 
A) 50% 
B) 30% 
C) 28.5% 
D) 23%

Question 11

Which is the greatest disadvantage of Pulse Code Modulation?

Accepted Answer

A) highly prone to noise 
B) cannot travel long distances 
C) its inability to handle analog signals 
D) large bandwidth is required for it 
A) highly prone to noise 
B) cannot travel long distances 
C) its inability to handle analog signals 
D) large bandwidth is required for it

Question 12

Find the total power, if the carrier of an AM transmitter is 800W and it is modulated to 50%?

Accepted Answer

A) 100w 
B) 800w 
C) 500w 
D) 900w 
A) 100w 
B) 800w 
C) 500w 
D) 900w

Question 13

FM can improve the receiver performance through adjustment of transmitted power.

Accepted Answer

A) True 
 B)False

Question 14

Quantization noise occurs in_________      _________

Accepted Answer

A) frequency division multiplexing 
B) time division multiplexing 
C) delta modulation 
D) amplitude modulation 
A) frequency division multiplexing 
B) time division multiplexing 
C) delta modulation 
D) amplitude modulation

Question 15

De-emphasis circuit is used_________

Accepted Answer

A) before detection 
B) after detection 
C) before encoding 
D) after encoding 
A) before detection 
B) after detection 
C) before encoding 
D) after encoding

Question 16

In digital communication system, in order to increase noise immunity, it is necessary to increase_________

Accepted Answer

A) signal power 
B) signal amplitude 
C) signal frequency 
D) signal magnitude 
A) signal power 
B) signal amplitude 
C) signal frequency 
D) signal magnitude

Question 17

Circular polarization involves critical alignment between transmitting and receiving antenna.

Accepted Answer

A) True 
 B)False

Question 18

Which of the following is not a technique for FM demodulation?

Accepted Answer

A) slope detection 
B) zero crossing detection 
C) product detector 
D) phase locked discriminator 
A) slope detection 
B) zero crossing detection 
C) product detector 
D) phase locked discriminator

Question 19

Half power bandwidth is also called

Accepted Answer

A) absolute bandwidth 
B) null to null bandwidth 
C) 3 db bandwidth 
D) zero db bandwidth 
A) absolute bandwidth 
B) null to null bandwidth 
C) 3 db bandwidth 
D) zero db bandwidth

Question 20

Which of the following stage is present in FM receiver but not in AM receiver?

Accepted Answer

A) amplitude limiter 
B) demodulator 
C) am amplifier 
D) mixer 
A) amplitude limiter 
B) demodulator 
C) am amplifier 
D) mixer

In angle modulation, signal to noise ratio before detection is a function of_________

Which of the following is not an advantage of digital modulation?

FFSR in AM systems stands for_________

A percentage of modulation greater than

Quantization is a_________process.

Non coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiver.

A narrow band noise can exist in

AM demodulation technique can be divided into_and_demodulation.

LCD uses_________

The antenna current is 10A. Find the percentage of modulation when the antenna current increases to 10.4A?

Which is the greatest disadvantage of Pulse Code Modulation?

Find the total power, if the carrier of an AM transmitter is 800W and it is modulated to 50%?

FM can improve the receiver performance through adjustment of transmitted power.

Quantization noise occurs in_ _

De-emphasis circuit is used_________

In digital communication system, in order to increase noise immunity, it is necessary to increase_________

Circular polarization involves critical alignment between transmitting and receiving antenna.

Which of the following is not a technique for FM demodulation?

Half power bandwidth is also called

Which of the following stage is present in FM receiver but not in AM receiver?

Information Theory and Communication Techniques

Waveform Logic, Pcm Encoding, Vocoder Analysis, and Antenna Radiations

Microwave Communication and Modulation

M-Ary Signalling and Pulse Shaping Techniques

Signal Filtering and Equalization Techniques

Information Theory and Coding Techniques

Channel Coding and Error Correction Techniques

Algorithms and Techniques for Communication System Security and Error Correction

Modulation Schemes and Access Techniques for Spread Spectrum Systems

Digital and Analog Telecommunications Standards

Filters

Exam 1: Modulation and Demodulation Techniques

In angle modulation, signal to noise ratio before detection is a function of_________

Which of the following is not an advantage of digital modulation?

FFSR in AM systems stands for_________

A percentage of modulation greater than

Quantization is a_________process.

Non coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiver.

A narrow band noise can exist in

AM demodulation technique can be divided into_________and_________demodulation.

LCD uses_________

The antenna current is 10A. Find the percentage of modulation when the antenna current increases to 10.4A?

Which is the greatest disadvantage of Pulse Code Modulation?

Find the total power, if the carrier of an AM transmitter is 800W and it is modulated to 50%?

FM can improve the receiver performance through adjustment of transmitted power.

Quantization noise occurs in_________ _________

De-emphasis circuit is used_________

In digital communication system, in order to increase noise immunity, it is necessary to increase_________

Circular polarization involves critical alignment between transmitting and receiving antenna.

Which of the following is not a technique for FM demodulation?

Half power bandwidth is also called

Which of the following stage is present in FM receiver but not in AM receiver?

Information Theory and Communication Techniques

Waveform Logic, Pcm Encoding, Vocoder Analysis, and Antenna Radiations

Microwave Communication and Modulation

M-Ary Signalling and Pulse Shaping Techniques

Signal Filtering and Equalization Techniques

Information Theory and Coding Techniques

Channel Coding and Error Correction Techniques

Algorithms and Techniques for Communication System Security and Error Correction

Modulation Schemes and Access Techniques for Spread Spectrum Systems

Digital and Analog Telecommunications Standards

Filters

AM demodulation technique can be divided into_and_demodulation.

Quantization noise occurs in_ _