Propagation of Waves in Atmosphere
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PHXII15:COMMUNICATION SYSTEMS

356832 The better propagation mode to propagate television frequency and radar signals is

1 Satellite communication
2 Ground propagation
3 Polarised communication
4 Skywave communication
PHXII15:COMMUNICATION SYSTEMS

356833 Attenuation of ground waves is due to
A. Difdfraction effect
B. Radio waves induce currents in the ground because of the polarisation

1 A & B are true
2 Only A is true
3 Only B is true
4 Both A & B false.
PHXII15:COMMUNICATION SYSTEMS

356834 While tuning in a certain broad cast station with a receiver, we are actually

1 Varying the local oscillator
2 Varying the resonant frequency of the circuit for the radio signal to be picked up
3 Tuning the antenna
4 Varying the current of receiver set
PHXII15:COMMUNICATION SYSTEMS

356835 A sky wave with a frequency \(55MHz\) is incident on \(D\)-region of earth's atmosphere at \(45^{\circ}\). The angle of redfraction is (electron density for \(D\) region is 400 electron \(/c{m^3}\) )

1 \(60^{\circ}\)
2 \(45^{\circ}\)
3 \(30^{\circ}\)
4 \(15^{\circ}\)
PHXII15:COMMUNICATION SYSTEMS

356836 Assertion :
Television signals are received through sky wave propagation.
Reason :
The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXII15:COMMUNICATION SYSTEMS

356832 The better propagation mode to propagate television frequency and radar signals is

1 Satellite communication
2 Ground propagation
3 Polarised communication
4 Skywave communication
PHXII15:COMMUNICATION SYSTEMS

356833 Attenuation of ground waves is due to
A. Difdfraction effect
B. Radio waves induce currents in the ground because of the polarisation

1 A & B are true
2 Only A is true
3 Only B is true
4 Both A & B false.
PHXII15:COMMUNICATION SYSTEMS

356834 While tuning in a certain broad cast station with a receiver, we are actually

1 Varying the local oscillator
2 Varying the resonant frequency of the circuit for the radio signal to be picked up
3 Tuning the antenna
4 Varying the current of receiver set
PHXII15:COMMUNICATION SYSTEMS

356835 A sky wave with a frequency \(55MHz\) is incident on \(D\)-region of earth's atmosphere at \(45^{\circ}\). The angle of redfraction is (electron density for \(D\) region is 400 electron \(/c{m^3}\) )

1 \(60^{\circ}\)
2 \(45^{\circ}\)
3 \(30^{\circ}\)
4 \(15^{\circ}\)
PHXII15:COMMUNICATION SYSTEMS

356836 Assertion :
Television signals are received through sky wave propagation.
Reason :
The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXII15:COMMUNICATION SYSTEMS

356832 The better propagation mode to propagate television frequency and radar signals is

1 Satellite communication
2 Ground propagation
3 Polarised communication
4 Skywave communication
PHXII15:COMMUNICATION SYSTEMS

356833 Attenuation of ground waves is due to
A. Difdfraction effect
B. Radio waves induce currents in the ground because of the polarisation

1 A & B are true
2 Only A is true
3 Only B is true
4 Both A & B false.
PHXII15:COMMUNICATION SYSTEMS

356834 While tuning in a certain broad cast station with a receiver, we are actually

1 Varying the local oscillator
2 Varying the resonant frequency of the circuit for the radio signal to be picked up
3 Tuning the antenna
4 Varying the current of receiver set
PHXII15:COMMUNICATION SYSTEMS

356835 A sky wave with a frequency \(55MHz\) is incident on \(D\)-region of earth's atmosphere at \(45^{\circ}\). The angle of redfraction is (electron density for \(D\) region is 400 electron \(/c{m^3}\) )

1 \(60^{\circ}\)
2 \(45^{\circ}\)
3 \(30^{\circ}\)
4 \(15^{\circ}\)
PHXII15:COMMUNICATION SYSTEMS

356836 Assertion :
Television signals are received through sky wave propagation.
Reason :
The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
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PHXII15:COMMUNICATION SYSTEMS

356832 The better propagation mode to propagate television frequency and radar signals is

1 Satellite communication
2 Ground propagation
3 Polarised communication
4 Skywave communication
PHXII15:COMMUNICATION SYSTEMS

356833 Attenuation of ground waves is due to
A. Difdfraction effect
B. Radio waves induce currents in the ground because of the polarisation

1 A & B are true
2 Only A is true
3 Only B is true
4 Both A & B false.
PHXII15:COMMUNICATION SYSTEMS

356834 While tuning in a certain broad cast station with a receiver, we are actually

1 Varying the local oscillator
2 Varying the resonant frequency of the circuit for the radio signal to be picked up
3 Tuning the antenna
4 Varying the current of receiver set
PHXII15:COMMUNICATION SYSTEMS

356835 A sky wave with a frequency \(55MHz\) is incident on \(D\)-region of earth's atmosphere at \(45^{\circ}\). The angle of redfraction is (electron density for \(D\) region is 400 electron \(/c{m^3}\) )

1 \(60^{\circ}\)
2 \(45^{\circ}\)
3 \(30^{\circ}\)
4 \(15^{\circ}\)
PHXII15:COMMUNICATION SYSTEMS

356836 Assertion :
Television signals are received through sky wave propagation.
Reason :
The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.
NEET DIGITAL LIBRARY
PHXII15:COMMUNICATION SYSTEMS

356832 The better propagation mode to propagate television frequency and radar signals is

1 Satellite communication
2 Ground propagation
3 Polarised communication
4 Skywave communication
PHXII15:COMMUNICATION SYSTEMS

356833 Attenuation of ground waves is due to
A. Difdfraction effect
B. Radio waves induce currents in the ground because of the polarisation

1 A & B are true
2 Only A is true
3 Only B is true
4 Both A & B false.
PHXII15:COMMUNICATION SYSTEMS

356834 While tuning in a certain broad cast station with a receiver, we are actually

1 Varying the local oscillator
2 Varying the resonant frequency of the circuit for the radio signal to be picked up
3 Tuning the antenna
4 Varying the current of receiver set
PHXII15:COMMUNICATION SYSTEMS

356835 A sky wave with a frequency \(55MHz\) is incident on \(D\)-region of earth's atmosphere at \(45^{\circ}\). The angle of redfraction is (electron density for \(D\) region is 400 electron \(/c{m^3}\) )

1 \(60^{\circ}\)
2 \(45^{\circ}\)
3 \(30^{\circ}\)
4 \(15^{\circ}\)
PHXII15:COMMUNICATION SYSTEMS

356836 Assertion :
Television signals are received through sky wave propagation.
Reason :
The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but reason is correct.