Q. A 75 ohm line is first short terminated and minima locations are noted. Then the short is replaced by resistive load and minima location are again noted. If minima location are not altered and VSWR is 3, the value of resistive load is

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Q. The word 'LORAN' means

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Q. The duty cycle of a radar transmitter is equal to

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Q. In a klystron amplifier the bunching effect

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Q. Which of the following modes of transmission will not be supported by a rectangular waveguide?

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Q. In a circular waveguide with radius r, the dominant mode is

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Q. If 'a' is the width of rectangular wave guide and 'λ' is the wave length, then

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Q. A parametric amplifier uses

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Q. Assertion (A): Impatt diode can be used in both amplifiers and oscillators.

Reason (R): Impatt diode has a low resistance.

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Q. Which one of the following can be used for amplification of microwave energy?

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Q. At frequencies of 10 MHz and higher the impedance represented by ground is primarity

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Q. A disadvantage of microstrip line as the connections of compared to strip line is that former

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Q. As frequency increases, the transmission efficiency

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Q. A circular polarizer converts a linearly polarized wave into a circularly polarised wave.

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Q. If D is diameter of circular waveguide the cutoff wave-length for TE₁₁ mode is equal to

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Q. The external magnetic field in a magnetron is such that lines are

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Q. Varactor diodes use

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Q. A circular waveguide carries TE₁₁ mode whole radial electric field is given by

Er = E₀j₁(r) sin Φ V/m
where r is radial distance in cm from the axis

The cut off wavelength is

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Q. The domain mode in rectangular waveguide is

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Q. The reverse voltage applied to a varactor diode

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