In a loss line RL < Z0, then Reflection coefficient is zero Reflection coefficie

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Correct Answer

Reflection coefficient is negative

Explanation

In a loss line RL < Z0, then Reflection coefficient is zero Reflection coefficient is ? Reflection c

Since R_L < Z₀, r_v is negative.

Microwave Communication problems

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1. Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line.
Reason (R): A quarter wave transformer is a transmission line of quarter wave length.
Options
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

2. The magnitudes of OC and SC input impedances of a transmission line an 100 ? and 25 ?. The characteristic impedance is
Options
A. 25 ?
B. 50 ?
C. 75 ?
D. 100 ?

3. Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.
Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.
Options
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

4. Assertion (A): PIN diode is commonly used for microwave control.
Reason (R): A PIN diode uses heavily doped p and n materials.
Options
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

5. Assertion (A): A backward wave oscillator can be used as a sweep generator.
Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.
Options
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

6. The correct sequence of parts in klystron amplifier are
Options
A. anode, catcher cavity, cathode, buncher cavity
B. cathode, buncher cavity, catcher cavity, cavity
C. anode, buncher cavity, catcher cavity, cathode
D. cathode, catcher cavity, anode, buncher cavity

7. Which of the following terminations makes the input impedance of a line equal to characteristic impedance Z₀?
Options
A. line open circuited at far end
B. line terminated in Z₀
C. line short circuited at far end
D. line terminated in inductance

8. A balun should have
Options
A. low SWR at both ports
B. high SWR at both ports
C. high SWR at input port and low SWR at output port
D. low SWR at input port and high SWR at output

9. The width of a radio beam from a 1 m diameter parabolic antenna at 1 GHz is about
Options
A. 100�
B. 50�
C. 5�
D. 2�

10. In microwave system the function of mode filter is
Options
A. to suppress modes with lower cut off frequencies
B. to suppress modes with higher cut off frequencies
C. to change mode of wave transmission
D. both (b) and (c)

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