Question 71 : The spectrum of white noise and impulse noise is similar in terms of ________
1. magnitude spectrum
2. phase spectrum
3. both magnitude spectrum and phase spectrum
4. amplitude spectrum
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Question 72 : What do you understand by isotropic antenna?
1. it radiates its power uniformly in all directions
2. it radiates its power non-uniformly in all directions
3. it radiates its power specifically in one direction only
4. it does not radiate any power
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Question 73 : Radiation resistance of an antenna is ________
1. a dc resistance
2. an ac resistance
3. a constant value
4. neither ac nor dc resistance
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Question 74 : If AM transmitter has low level modulation then it has ________
1. high efficiency
2. poor efficiency
3. high modulating power
4. high resistance towards noise
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Question 75 : ITU stands for ________
1. Indian Telecommunication Union
2. Indian Telephonic Union
3. International Telephonic Union
4. International Telecommunication Union
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Question 76 : Which among the following is Analog Continuous Modulation technique?
1. PAM
2. PCM
3. AM
4. PM
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Question 77 : Effective noise at high frequencies is ________
1. Johnson noise
2. Flicker noise
3. transit-time noise
4. Partition noise
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Question 78 : What is the ITU designation range for VHF?
1. 30 to 300 Kilohertz
2. 300 to 3000 Kilohertz
3. 30 to 300 Megahertz
4. 3 to 30 Megahertz
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