356820
Assertion : A dish antenna is highly directional. Reason : This is because a dipole antenna is omni directional.
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.
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356821
Consider telecommunication through optical fibres. Which of the following statements is not true?
1 Optical fibres may have homogeneous core with a suitable cladding
2 Optical fibres can be of graded redfractive index
3 Optical fibres are subject to electromagnetic interference from outside
4 Optical fibres have extremely low transmission loss
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356822
For efficient transmission and reception, the height of antenna should be at least
1 \({\lambda / 2}\)
2 \({\lambda}\)
3 \({\lambda / 3}\)
4 \({\lambda / 4}\)
Explanation:
To radiate signals with high efficiency, the antenna should have a size comparable to the wavelength \({\lambda}\) of the signal at least \({\lambda / 4}\). So correct option is (4)
PHXII15:COMMUNICATION SYSTEMS
356823
Long range radio transmission is possible when the radiowaves are reflected from the ionosphere. For this to happen the frequency of the radiowaves must be in the range:
356820
Assertion : A dish antenna is highly directional. Reason : This is because a dipole antenna is omni directional.
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.
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356821
Consider telecommunication through optical fibres. Which of the following statements is not true?
1 Optical fibres may have homogeneous core with a suitable cladding
2 Optical fibres can be of graded redfractive index
3 Optical fibres are subject to electromagnetic interference from outside
4 Optical fibres have extremely low transmission loss
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356822
For efficient transmission and reception, the height of antenna should be at least
1 \({\lambda / 2}\)
2 \({\lambda}\)
3 \({\lambda / 3}\)
4 \({\lambda / 4}\)
Explanation:
To radiate signals with high efficiency, the antenna should have a size comparable to the wavelength \({\lambda}\) of the signal at least \({\lambda / 4}\). So correct option is (4)
PHXII15:COMMUNICATION SYSTEMS
356823
Long range radio transmission is possible when the radiowaves are reflected from the ionosphere. For this to happen the frequency of the radiowaves must be in the range:
356820
Assertion : A dish antenna is highly directional. Reason : This is because a dipole antenna is omni directional.
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.
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356821
Consider telecommunication through optical fibres. Which of the following statements is not true?
1 Optical fibres may have homogeneous core with a suitable cladding
2 Optical fibres can be of graded redfractive index
3 Optical fibres are subject to electromagnetic interference from outside
4 Optical fibres have extremely low transmission loss
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356822
For efficient transmission and reception, the height of antenna should be at least
1 \({\lambda / 2}\)
2 \({\lambda}\)
3 \({\lambda / 3}\)
4 \({\lambda / 4}\)
Explanation:
To radiate signals with high efficiency, the antenna should have a size comparable to the wavelength \({\lambda}\) of the signal at least \({\lambda / 4}\). So correct option is (4)
PHXII15:COMMUNICATION SYSTEMS
356823
Long range radio transmission is possible when the radiowaves are reflected from the ionosphere. For this to happen the frequency of the radiowaves must be in the range:
356820
Assertion : A dish antenna is highly directional. Reason : This is because a dipole antenna is omni directional.
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.
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356821
Consider telecommunication through optical fibres. Which of the following statements is not true?
1 Optical fibres may have homogeneous core with a suitable cladding
2 Optical fibres can be of graded redfractive index
3 Optical fibres are subject to electromagnetic interference from outside
4 Optical fibres have extremely low transmission loss
Explanation:
Conceptual Question
PHXII15:COMMUNICATION SYSTEMS
356822
For efficient transmission and reception, the height of antenna should be at least
1 \({\lambda / 2}\)
2 \({\lambda}\)
3 \({\lambda / 3}\)
4 \({\lambda / 4}\)
Explanation:
To radiate signals with high efficiency, the antenna should have a size comparable to the wavelength \({\lambda}\) of the signal at least \({\lambda / 4}\). So correct option is (4)
PHXII15:COMMUNICATION SYSTEMS
356823
Long range radio transmission is possible when the radiowaves are reflected from the ionosphere. For this to happen the frequency of the radiowaves must be in the range:
