If 'a' is the width of rectangular wave guide and '?' is the wave length, then

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Home ‣ Electronics and Communication Engineering ‣ Microwave Communication Comments

Question
If 'a' is the width of rectangular wave guide and '?' is the wave length, then
Options
A.
B.
C.
D.

Correct Answer

Microwave Communication problems

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1. Which of the following modes of transmission will not be supported by a rectangular waveguide?
Options
A. TE₁₅
B. TE₁₂
C. TM₁₁
D. TM₁₀

Discuss

Correct Answer: TM₁₀

2. In a TWT the amplitude of resultant wave travelling down the helix remains constant
Options
A. True
B. False

Discuss

Correct Answer: False

Explanation:

The signal gets strengthened.

3. The skin depth at 1000 MHz as compared to that at 500 MHz is
Options
A. 2
B. 12
C. 0.707
D. 0.5

Discuss

Correct Answer: 0.707

4. The reverse voltage applied to a varactor diode
Options
A. is less than avalanche breakdown voltage
B. is more than avalanche breakdown voltage
C. may be more or less than a avalanche breakdown voltage
D. is very high as compared to avalanche breakdown voltage

Discuss

Correct Answer: is less than avalanche breakdown voltage

Explanation:

The action of varactor diode is due to the capacitance of depletion layer. The thickness of depletion layer depends on the reverse bias which should not cause breakdown.

5. At frequencies of 10 MHz and higher the impedance represented by ground is primarity
Options
A. resistive
B. inductive
C. capacitive
D. partly resistive and partly capacitive

Discuss

Correct Answer: capacitive

6. Which one of the following can be used for amplification of microwave energy?
Options
A. TWT
B. Magnetron
C. Reflex klystron
D. Gunn diode

Discuss

Correct Answer: TWT

7. The transit time (in cycles) for electrons in repeller space of reflex klystron oscillator for sustaining oscillations is (n is any integer)
Options
A. 2(n - 1)
B. 2n - 1
C.
D.