Discussion
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- Question
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
- Correct Answer
- TE21
- 1. 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
- 2. 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
- 3. 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
- 4. 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 Discuss
- 5. 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
- 6. 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
- 7. Assertion (A): In a power divider SH = 0, S21 = 0.707 = S3,
Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3
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. The p mode of operation of magnetron signifies that
Options- A. the phase difference between adjacent anode poles is p radians
- B. the phase difference between adjacent anode poles is a multiple of p radians
- C. the total phase shift around the periphery is p radians
- D. none of the above Discuss
- 9. Directive gain of elementary doublet is
Options- A. 100
- B. 10
- C. 1.5
- D. 0.5 Discuss
- 10. Which of the following is used in integrated circuits?
Options- A. Microstrip line
- B. Coaxial line
- C. Twin wire line
- D. Shield cable Discuss
Microwave Communication problems
Search Results
Correct Answer: the voltage at termination is doubled the incident voltage
Correct Answer: Both A and R are correct but R is not correct explanation of A
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: resonant frequency of cavity
Correct Answer: increasing the power handling capacity
Correct Answer: Both A and R are correct and R is correct explanation of A
Correct Answer: the phase difference between adjacent anode poles is p radians
Correct Answer: 1.5
Correct Answer: Microstrip line
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