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55.

In a circular waveguide with radius ‘t’ the dominant mode is
a. TM₀₁
b. TE₀₁
c. TM₁₁
d. TE₁₁

asked in Electronics Paper-2, 1997

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56.

A cylindrical cavity resonator has a diameter of 16 mm. what is the dominant resonant mode when the cavity length is (i) 20 mm and (ii) 15 mm?

(i) (ii)

a TE₁₁₁ TM₁₁₁

b TM₀₁₀ TE₁₁₁

c TE₁₁₁ TM₀₁₀

d TM₁₁₁ TE₀₁₀

asked in Electronics Paper-2, 1997

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57.

A loss-less line having characteristic impedance Z₀ is terminated in a pure reactance of value –jZ₀. The VSWR of the line will be
a. 10
b. 2
c. 1
d. Infinite

asked in Electronics Paper-2, 1997

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58.

Guide wavelength (λ_g) of a waveguide are related as

asked in Electronics Paper-2, 1997

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59.

Which one of the following can be used for amplification of microwave energy?
a. Traveling wave tube
b. Magnetron
c. Reflex klystron
d. Gunn diode

asked in Electronics Paper-2, 1997

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60.

The transit time (in cycles) for the electrons in the repeller-space of the relax klystron oscillator for sustaining oscillations is (in is any integer including zero)
a. 2(n −1)
b. 2n −1
c. n + 1/2
d. n + 3/2

asked in Electronics Paper-2, 1997

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