Microwave Communication problems
- 1. A rectangular waveguide has two stubs each length
connected at the source end. The stubs are short circuted. Then
Options- A. the longitudinal current is power current and current in stubs is reactive
- B. the longitudinal current is reactive current and current in stubs is power current
- C. both power and reactive exists in both longitudinal direction and stubs
- D. the current in stubs is zero Discuss
Correct Answer: the longitudinal current is power current and current in stubs is reactive
- 2. A transmission line discontinuity is defined as any interruption in the uniformity of the line.
Options- A. True
- B. False Discuss
Correct Answer: True
- 3. Interference generated by electrical equipment and automobile ignition systems when observed closed to earth is
Options- A. horizontally polarized
- B. vertically polarized
- C. polarized both horizontally
- D. not polarized Discuss
Correct Answer: vertically polarized
- 4. Which of the following is a balanced line?
Options- A. Coaxial line
- B. Strip line
- C. Microstrip line
- D. TV twin lead Discuss
Correct Answer: TV twin lead
- 5. Consider the following statements
- Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.
- For a given value of TM10 cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.
- Ridge wave guide has higher conductor losser than a rectangular waveguide.
- Ridge guide has higher conductor losser than a rectangular waveguide.
Options- A. 1 and 2 only
- B. 1, 2 and 3 only
- C. 2 and 3 only
- D. All Discuss
Correct Answer: 1, 2 and 3 only
- 6. 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
Correct Answer: microwaves
- 7. 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
Correct Answer: crystal diode operates in square law region of i-v characteristics
- 8. 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
Correct Answer: almost equal to forward gain of tube
- 9. 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
Correct Answer: The wall thickness is very small as compared to skin depth
- 10. 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
Correct Answer: matched load, antenna, receiver and CW transmitter
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