For a waveguide, which of the following statements is wrong? It is usually made

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Question
For a waveguide, which of the following statements is wrong?
Options
A. It is usually made of brass or aluminium
B. It is usually rectangular or circular in shape
C. The dielectric region is usually air
D. The wall thickness is very small as compared to skin depth

Correct Answer

The wall thickness is very small as compared to skin depth

Microwave Communication problems

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1. In a TWT the loss in attenuator is
Options
A. almost equal to forward gain of tube
B. much less than forward gain of tube
C. much higher than forward gain of tube
D. almost infinite

2. In laboratory experiment the output from reflex klystron is moderated by square wave because
Options
A. it is easy to generate a square wave
B. crystal diode operates in square law region of i-v characteristics
C. it prevents frequency modulation
D. detector circuit is less complicated

4. Consider the following statements
1. Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.
2. For a given value of TM₁₀ cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.
3. Ridge wave guide has higher conductor losser than a rectangular waveguide.
4. Ridge guide has higher conductor losser than a rectangular waveguide.
Which of the above statements are correct?
Options
A. 1 and 2 only
B. 1, 2 and 3 only
C. 2 and 3 only
D. All

6. A magic tee is to be used as CW duplexer. Then port 1, port 2, port 3 (E arm), port 4 (H arm) respectively should be connected to
Options
A. matched load, antenna, receiver and CW transmitter
B. CW transmitter, antenna, receiver and matched load
C. CW transmitter, receiver, antenna and matched load
D. CW transmitter, matched load, receiver and antenna

7. Two identical hybrid tees are joined as shown in the given figure. If 16 mW power is fed into port 1, the power output at ports 2 , 3, 1', 2', 3' respectively is
Options
A. 8, 4, 2, 2, 0 mW
B. 0, 8, 4, 4, 0 mW
C. 0, 8, 2, 2, mW
D. 8, 2, 4, 2, 0 mW

8. In p mode of operation of magnetron the spikes due to phase focussing effect rotate at an angular velocity corresponding to
Options
A. one pole/cycle
B. two pole/cycle
C. four pole/cycle
D. six pole/cycle

10. Assertion (A): In rectangular waveguide TE₀₁ mode is just TE₁₀ mode rotated by 90�.
Reason (R): When a rectangular waveguide is rotated by 90�, the broad and narrow dimensions get interchanged.
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

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