Q. Consider the following statements:

1. Impedance of Gunn diode is about tens of ohms.
2. Impedance of Impatt diode is a few ohms.
3. Impedance of Impatt diode are of the same order.
4. Impedance of Impatt diode is more than that of Gunn diode.

Which of the above statement are correct?

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Q. In high frequency circuits impedance matching can be done by

1. open circuited stubs
2. short circuited stubs
3. λ/4 transformer

Which of the above correct?

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Q. The directive gain of a transmitting antenna is proportional to

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Q. In a loss line RL < Z0, then

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Q. Assertion (A): A backward wave oscillator can be used as a sweep generator.

Reason (R): The frequency of oscillation of a backward wave oscillator can be changed by varying the voltage which controls the beam velocity.

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Q. If a line having Z₀ = 300 ∠ 0 W is open circuited at far end, VSWR is

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Q. If f is the frequency of electromagnetic wave, fc is cutoff frequency, then in a rectangular waveguide

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Q. Assertion (A): The condition of minimum distortion in a transmission line is L = RC/G.

Reason (R): Line loading means addition of inductance to satisfy the condition L = RC/G.

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Q. A magnetron has a cylindrical cathode surrounded by an anode structure having cavities opening into interaction space by means of slots

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Q. The correct sequence of parts in klystron amplifier are

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Q. Which of the following terminations makes the input impedance of a line equal to characteristic impedance Z₀?

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Q. In microwave system the function of mode filter is

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Q. The total field developed by an antenna array at a distant point is

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Q. High speed logic circuits use

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Q. Which one of the following is transferred locking electron device C antenna?

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Q. A magnetron requires an external magnetic field with flux lines parallel to axis of cathode

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Q. When a line short circuited at far end, the minimum voltage occurs at

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Q. In a TWT the axial component of electric field advances along the tube

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Q. If other parameter are constant, transmission loss at 5 GHz as compared to that at 0.5 GHz is

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Q. For a circular wave guide

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