Q. One of the advantages of base modulation over collector modulation in a class C transistor amplifier is

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Q. In an AM transmitter after the modulation stage, class C amplifier

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Q. The maximum number of AM broadcast stations that can be accommodated in a 100 kHz bandwidth for the highest modulating frequency of 5 kHz will be

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Q. For a short dipole having an effective length less than half the wavelength the radiation resistance is

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Q. In a low level amplitude modulated system, the amplifier modulated stage must be

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Q. A noise can be represented as superposition of spectral components. When this noise is passed through a narrow band filter, the output of filter should look like

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Q. A narrow band noise show

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Q. The upper and lower side frequencies for 3 kHz audio modulation with a 27 MHz carrier frequency will be

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Q. Consider the following advantages of phase array radar

1. simple circuitry
2. ability to track and scan simultaneously
3. ability to track many targets together
4. very fast scanning

Which of the above are correct?

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Q. An antenna having a length of λ/4 and grounded at one end is called

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Q. The noise figure of individual stages of a two stage amplifier is 2.03 and 1.54 respectively. If gain of first stage is 62, the overall noise figure is

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Q. A trinitron colour picture tube uses

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Q. Which of the following circuits cannot be demodulate SSB?

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Q. During day time ionosphere can be considered to be consisting of

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Q. Baudot code is a six bit code.

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Q. PWM can be generated

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Q. Consider the following statements as regards SAW filter

1. The centre frequency is determined by the pitch of IDT comb shaped electrodes
2. The response can be modified shaping the overlap of comb electrodes
3. The response is maximum when acoustic wave has its wavelength equal to pitch
4. When a number of identical electrodes are arranged at the same pitch, the frequency characteristics of the filter is expressed by (sin x)/x

Which of the above statements are correct?

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Q. In telephone, the dial tone has a frequency of

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Q. Companding is used

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Q. For a good public address system the sound intensity at the farthest point should be at least

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