An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase veloci

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Question
An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at frequency of 3 GHz for TE₁₀ mode is
Options
A. 1.5 x 10⁸ m/s
B. 5.5 x 10⁸ m/s
C. 3.46 x 10⁸ m/s
D. 0.18 x 10⁷ m/s

Correct Answer

3.46 x 10⁸ m/s

Explanation

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at

An air-filled rectangular waveguide has dimensions 8cm x 10cm . The phase velocity of guided wave at

? V_P = 3.46 x 10⁸ m/s.

Exam Questions Papers problems

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1. The equivalent form of the logical expression ABC + A BC + ABC + ABC + AB C is
Options
A. C + (A ? B)
B. (A + B + C)(A + B + C)
C. (A + B + C)(A + B + C)(A + B + C)
D. (A + B + C)(A + B + C)(A + B + C)

2. What is the propagation constant for air filled wave guide with dimensions a = 1.59" and b = 0.795" at 4.95 GHz?
Options
A. 0.6698
B. 0.7698
C. 0.503
D. 0.6598

3. When phase-lag compensation is used in a system, then gain cross over frequency, bandwidth and undamped frequency are respectively
Options
A. Increased, Increased, Increased
B. Increased, Increased, Decreased
C. Increased, Decreased, Decreased
D. Decreased, Decreased, Decreased

4. Consider a unity feedback control system with open-loop transfer function The steady state error of the system due to a unity step input is :
Options
A. zero
B. K
C. 1/K
D. infinite

5. Radiation resistance of an antenna is 54 ? and loss resistance is 6 ?. If antenna has power gain of 10, then directivity is:
Options
A. 9
B. 11.11
C. data not sufficient
D. 10

6. If x[n] then the sequence x[n] is
Options
A. non-periodic
B. periodic
C. depends on n
D. none of these

7. The impulse response and the excitation function of a linear time invariant causal system are shown in figure (a) and (b) respectively. The output of the system at t = 2 sec is equal to
Options
A. 0
B. 2
C.
D.

8. Consider the following
1. Maximum energy of electrons liberated photoelectrically is independent of light intensity
2. Maximum energy of electrons liberated photoelectrically varies nonlinearly with frequency of incident light.
Options
A. (1) is true and (2) is false
B. (1) and (2) both are true
C. (1) is false and (2) is true
D. (1) and (2) both are false

9. In a flash type ADC, employing 15 comparators resolution with 10 volts reference; is expected to be :
Options
A. 0.625 V
B. 0.656 V
C. 0.525 V
D. insufficient data

10. Consider the system with and where p and q are arbitrary real numbers. Which of the following statements about the controllability of the system is true?
Options
A. The system is completely state controllable for any non zero values p and q
B. Only p = 0 and q = 0 result in controllability
C. The system is uncontrollable for all values of p and q
D. We cannot conclude about controllability from the given data

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