Q. Assertion (A): For high frequency lines inductive reactance is very high as compared to ac resistance.

Reason (R): Due to skin effect ac resistance of line is higher than dc resistance.

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Q. Consider the following applications

1. Switch
2. Attenuator
3. Phase shifter
4. Oscillator

In which of the above can a PIN diode be used?

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Q. Out of modes TE₂₀ and TE₃₀ of propagation of electromagnetic engery

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Q. A TE₁₀ rectangular waveguide is to be designed for operation over 25-35 GHz and the band centre is 1.5 times the cutoff frequency. The dimension of broadside is

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Q. In a klystron amplifier the force on all electrons

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Q. If load impedance ZL >> Z0, then

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Q. The inductance of a twin feeder used to connect antenna to TV receiver is about

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Q. Assertion (A): Impatt diode is an avalanche diode.

Reason (R): Avalanche breakdown phenomenon occurs when a p-n junction is reverse biased.

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Q. A radar has a maximum range of 120 km. The maximum allowable pulse repetition frequency for unambiguous reception is

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Q. In a line with finite attenuation

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Q. The electric field in a TWT due to applied signal

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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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