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- Question
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
- Correct Answer
- 0, 8, 4, 4, 0 mW
- 1. 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 Discuss
- 2. 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 Discuss
- 3. 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 Discuss
- 4. 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 Discuss
- 5. To study electromagnetic radiations from astronomical objects, radio astronomers use
Options- A. low frequencies
- B. medium frequencies
- C. microwaves
- D. either (a) or (b) Discuss
- 6. 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 Discuss
- 7. If a and b are the width and height of rectangular wave-guide the cut off wavelength ?c for TE20 mode is equal to
Options- A. a
- B. a + b
- C. a - b
- D. a2 + b2 Discuss
- 8. 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 Discuss
- 9. In microwave system, waveguide twists
Options- A. change the plane of polarization of a propagating wave
- B. change the direction of a propagating wave
- C. change the mode of a propagating wave
- D. both (b) and (c) Discuss
- 10. In TE10 mode the largest electric field in a rectangular wave guide, occurs
Options- A. along centre line of broad wall (i.e. x = a/2)
- B. along the broad wall (i.e. x = 0 and x = a)
- C. either (a) or (b)
- D. neither (a) nor (b) Discuss
Microwave Communication problems
Search Results
Correct Answer: matched load, antenna, receiver and CW transmitter
Correct Answer: The wall thickness is very small as compared to skin depth
Correct Answer: almost equal to forward gain of tube
Correct Answer: crystal diode operates in square law region of i-v characteristics
Correct Answer: microwaves
Correct Answer: two pole/cycle
Correct Answer: a
Correct Answer: Both A and R are correct and R is correct explanation of A
Correct Answer: change the plane of polarization of a propagating wave
Correct Answer: along centre line of broad wall (i.e. x = a/2)
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