A balun should have low SWR at both ports high SWR at both ports high SWR at inp

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Question
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

Correct Answer

low SWR at both ports

Explanation

Turn ratio is so selected as to give low SWR at both ports.

Microwave Communication problems

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1. 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

2. 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

4. 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

5. 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 ?

6. 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�

7. 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)

8. The main feature of a parametric amplifier is
Options
A. low noise
B. very high gain
C. broad bandwidth
D. both (b) and (c)

10. Which one of the following is transferred locking electron device C antenna?
Options
A. BARITT diode
B. IMPATT diode
C. Gunn diode
D. Step recovery diode

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