Electronics and Communication Engineering - Microwave Communication

41. 

Assertion (A): Inter-digitated geometry is widely used for microwave transistors.

Reason (R): Tuning at input and output of transistor uses MOS chip capacitors.

A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Answer: Option B

Explanation:

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42. 

For a 1 cm x 2 cm air filled rectangular waveguide the maximum frequency should be less than about

A. 1000 MHz
B. 5000 MHz
C. 14000 MHz
D. 140000 MHz

Answer: Option C

Explanation:

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43. 

Hollow waveguides are used as transmission lines at frequencies

A. above 1 GHz
B. above 5 GHz
C. above 10 MHz
D. above 1 MHz

Answer: Option B

Explanation:

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44. 

If rv is reflection coefficient and VSWR is voltage standing wave ratio, then

A.
B.
C.
D.

Answer: Option B

Explanation:

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45. 

In the given figure the equivalent circuit of a T attenuator. If the condition for matched attenuator is

A.
B.
C.
D.

Answer: Option A

Explanation:

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