Question 21 : What is the maximum transmission efficiency?
1. 67.88%
2. 33.33%
3. 73%
4. 54.03%
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Question 22 : What is the role of transmitter in communication system?
1. to decode a signal to be transmitted
2. to convert one form of energy into other
3. to detect and amplify information signal from the carrier
4. to produce radio waves to transmit data
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Question 23 : Ring Modulator is ________
1. used for DSB-SC generation
2. used for SSB-SC generation
3. used for VSB generation
4. used for AM generation
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Question 24 : Square Law modulators are?
1. used for frequency modulation
2. used for pulse width modulation
3. used for amplitude modulation
4. used for phase modulation
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Question 25 : In TV transmission, sound signal is ________ modulated.
1. Phase
2. Pulse
3. Frequency
4. Amplitude
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Question 26 : In TV transmission, picture signal is ________ modulated.
1. DSB-SC
2. VSB
3. SSB-SC
4. Pulse
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Question 27 : Modulation is done in ________
1. Receiver
2. Transducer
3. Between transmitter and radio receiver
4. Transmitter
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Question 28 : Which device is used for tuning the receiver according to incoming signal (especially in TV)?
1. Low pass filter
2. High pass filter
3. Zener diode
4. Varacter diode
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Question 29 : Ability of receivers to select the wanted signals among various incoming signal is called ________
1. Selectivity
2. Fidelity
3. Sensitivity
4. Modulation
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Question 30 : Cell phones sent information in form of ________
1. microwaves
2. electrical signals
3. infrared Waves
4. radio waves
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