Discussion
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- Question
Assertion (A): Two equal and opposite travelling waves result in a standing wave.
Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.
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
- Correct Answer
- Both A and R are correct but R is not correct explanation of A
- 1. The frequency of oscillations obtained from a reflex klystron depends mainly on
Options- A. resonant frequency of cavity
- B. repeller voltage
- C. voltage of focussing electrode
- D. characteristics of cathode Discuss
- 2. Fields are said to be circularly polarized if
Options- A. their magnitudes are equal
- B. their magnitudes are equal and they differ in phase by ± 90°
- C. their magnitudes are unequal and they differ in phase ± 90°
- D. their magnitudes are unequal and they are in phase Discuss
- 3. The main advantage of TWT over klystron is
Options- A. higher bandwidth
- B. higher gain
- C. higher frequency
- D. higher output Discuss
- 4. VTM stands for voltage tunable magnetron.
Options- A. True
- B. False Discuss
- 5. A line of characteristic impedance 400 ? is terminated by a resistance of 400 ?. The reflected quantities are
Options- A. zero
- B. equal to incident quantities
- C. half the incident quantities
- D. double the incident quantities Discuss
- 6. In TE and TM modes of rectangular waveguides having propagation in z direction
Options- A. Ez and Hz are both zero
- B. In TE mode Ez is zero and in TM mode Hz is zero
- C. In TE mode Hz is zero and in TM mode Ez is zero
- D. In both TE and TM modes both Ez and Hz are non-zero Discuss
- 7. Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases.
Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential.
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
- 8. When a wave reaches an open circuit
Options- A. the voltage at termination is doubled the incident voltage
- B. the current at termination is doubled the incident voltage
- C. the voltage at termination is zero
- D. both V and I at termination are doubled the incident voltage and current Discuss
- 9. In a rectangular waveguide there is one half wave variation of electric field across the narrow dimension and two half wave variations of electric field across wider dimension. The dominant mode is
Options- A. TM12
- B. TE13
- C. TE21
- D. TM25 Discuss
- 10. Wave guides are pressurised above normal atmospheric pressure for
Options- A. increasing the power handling capacity
- B. improving conductivity of walls
- C. preventing higher modes from propagation
- D. varying the wave impedance Discuss
Microwave Communication problems
Search Results
Correct Answer: resonant frequency of cavity
Correct Answer: their magnitudes are equal and they differ in phase by ± 90°
Correct Answer: higher bandwidth
Correct Answer: True
Correct Answer: zero
Correct Answer: In TE mode Ez is zero and in TM mode Hz is zero
Correct Answer: Both A and R are correct but R is not correct explanation of A
Correct Answer: the voltage at termination is doubled the incident voltage
Correct Answer: TE21
Correct Answer: increasing the power handling capacity
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