Electronics and Communication Engineering - Microwave Communication

16. 

The most commonly used magnetron is

A. cylindrical
B. parallel plate
C. inclined plate
D. flat plate

Answer: Option A

Explanation:

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17. 

The effect of earth's magnetic field on radiowaves is minimum when

A. the electric field lines of radio waves and flux line of earth's magnetic field are in the same direction
B. the electric field lines of radio waves and flux lines of earth's magnetic field are at right angles
C. the electric field lines of radiowaves and flux lines of earth's magnetic field oppose each other
D. both (b) and (c)

Answer: Option A

Explanation:

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18. 

A line of characteristic impedance Z0 branches into two line each with characteristic impedance Z0. The refracted voltage is

A. zero
B. infinite
C. equal to incident voltage
D. two third of incident voltage

Answer: Option D

Explanation:

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19. 

The resistance values of a PIN diode under positive bias and negative bias respectively are about

A. a few ohms and a kilo ohms
B. about 100 ohms and 1000 ohms
C. about 0.1 ohm and 100 ohms
D. about 1000 ohms and 10000 ohms

Answer: Option A

Explanation:

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20. 

A PIN diode can be used

A. as a shunt mounted switch
B. as a series mounted switch
C. both as series or shunt mounted switch
D. non of the above

Answer: Option C

Explanation:

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