6. 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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7. Guide wavelength (λ_g), cut off wavelength (λ_c) and freespace wavelength (λ₀) of a waveguide are related as:

1. 1. 1	=	1	−	1
      λ2g		λ20		λ2c

   
   
   

   2. 1	=	1	−	1
      λ02		λg2		λc2

   
   
   

   3. 1	=	1	+	1
      λc2		λc2		λg2

   
   
   

   4. 1	=	1	+	1
      λg		λ0		λc

   
   
   

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   NA

   Correct Option: A

   NA

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8. In a circular waveguide with radius ‘r’, the dominant mode is:
   

1. 1. TM₀₁
      

   
   
   

   2. TE₀₁
      

   
   
   

   3. TM₁₁
      

   
   
   

   4. TE₁₁

   
   
   

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   NA

   Correct Option: A

   NA

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9. A loss-less line having characteristic impedance Z0 is terminated in a pure reactance of value – jZ₀. The VSWR of the line will be:
   

1. 1. 10
      

   
   
   

   2. 2
      

   
   
   

   3. 1
      

   
   
   

   4. Infinite

   
   
   

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   NA

   Correct Option: D

   NA

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10. A disadvantage of microstrips with respect to stripline circuit is that the former:
    

1. 1. Do not let themselves to be printed-circuit techniques
      

   
   
   

   2. Are more likely to radiate
      

   
   
   

   3. Are bulkier
      

   
   
   

   4. Are more expensive and complex to manufacture
      

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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