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Maximum Usable Frequency MCQ Questions & Answers

Maximum Usable Frequency MCQs : This section focuses on the "Maximum Usable Frequency". These Multiple Choice Questions (MCQs) should be practiced to improve the Maximum Usable Frequency skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Find the MUF for the wave operating at a critical frequency 6MHz and having the skip distance d as 25km and virtual height of 100km in the ionosphere layer.

A. 6.05MHz
B. 1.25MHz
C. 1.025MHz
D. 3.25MHz

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Question 2

If wave exceeds the MUF then it is not reflected back.

A. TRUE
B. FALSE

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Question 3

Relation between MUF and critical frequency is ______

A. fc = fMUF secθi
B. fMUF = fc sec2 θi
C. fc = fMUF sinθi
D. fMUF = fc secθi

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Question 4

Skip distance is the _____

A. Minimum distance at which wave returns back at the lowest possible frequency
B. Maximum distance at which wave returns back at the critical frequency
C. Minimum distance at which wave returns back at the critical angle
D. Maximum distance at which wave returns back at the lowest possible frequency

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Question 5

Suppose a ray is incident normally in the ionosphere region with electron density 25×1010/cm3, then the Maximum usable frequency is _____

A. 5GHz
B. 45MHz
C. 4.5MHz
D. 125GHz

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Question 6

The frequency below which the entire power gets absorbed is called as ____

A. MUF
B. LUF
C. Critical frequency
D. Optimum frequency

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Question 7

The maximum possible frequency for which the wave is reflected back for a given distance of propagation in the ionosphere layer is called as_______

A. Maximum usable frequency
B. Critical frequency
C. Resonance frequency
D. Dominating frequency

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Question 8

What is the refractive index of the region operating at 16MHz frequency with the electron density 49×1010/cm3?

A. 0.518
B. 0.919
C. 0.155
D. 0.845

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Question 9

What is the value of maximum usable frequency when the incident angle is 60° and the critical frequency is 4.5MHz?

A. 4.5MHz
B. 2.25MHz
C. 9MHz
D. 18MHz

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Question 10

Which of the following is true when a ray is incident normally in an Ionosphere region?

A. MUF is equal to critical frequency
B. MUF is greater than critical frequency
C. MUF is less than critical frequency
D. MUF is zero

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Question 11

Which of the following statements is false?

A. MUF is always greater than or equal to critical frequency depending on the incident angle
B. Optimum frequency is the frequency at which optimum reflection of wave takes place
C. Beyond the MUF, the entire wave gets reflected back
D. Below LUF, the entire power of wave gets absorbed

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