1. The transmission path loss L in the free space between a communication satellite operating at a frequency f and at a distance d from the earth station is:
   

1. 1. Directly proportional to fd
      

   
   
   

   2. Directly proportional to f²d²
      

   
   
   

   3. Inversely proportional to f
      

   
   
   

   4. Directly proportional to f³d³

   
   
   

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   NA

   Correct Option: A

   NA

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2. A slot line is etched on the ground plane of a microstrip. Coupling between the slot line and the microstrip, on the two sides of the same substrate, takes place through which one of the following mechanisms?
   

1. 1. The coupling is magnetic and is maximum when they are at right angles
      

   
   
   

   2. The coupling is electric and is maximum when they are parallel
      

   
   
   

   3. The coupling is magnetic and is minimum when they are at right angles
      

   
   
   

   4. The coupling is electric and is minimum when they are at right angles

   
   
   

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   NA

   Correct Option: B

   NA

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3. Consider the following statements: Laser is an acronym for light amplification by stimulated emission of radiation. In comparison to LED, it has:
   (i) Higher emission efficiency
   (ii) No tuning arrangements
   (iii) Narrow spectral width
   (iv) Provision for confinement Of the statements:
   

1. 1. (i), (iii) and (iv) are correct
      

   
   
   

   2. (i), (ii) and (iii) are correct
      

   
   
   

   3. (i) and (iii) are correct
      

   
   
   

   4. (i), (ii) and (iv) are correct

   
   
   

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   NA

   Correct Option: A

   NA

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4. The transit time (in cycles) for the electrons in the repeller space of a reflex klystron oscillator for sustaining oscillations is [n is any integer including zero]:
   

1. 1. 2 (n – 1)
      

   
   
   

   2. 2n – 1
      

   
   
   

   3. n + 1/2
      

   
   
   

   4. n + 3/4

   
   
   

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   NA

   Correct Option: D

   NA

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5. To increase the radar range of ground and surface targets to see well beyond the normal radar horizon, the electromagnetic wave propagation adopted is:
   

1. 1. Ionospheric scatter
      

   
   
   

   2. Tropo scatter
      

   
   
   

   3. Ground wave propagation
      

   
   
   

   4. Duct

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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