Q. In AM increased depth of modulation increases __________ and in FM with increased depth of modulation __________ increases.

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Q. In a DM system, the granular noise occurs when modulating signal

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Q. Huffman code is also known as redundancy code

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Q. If each frequency component of f(t) is shifted by π/2, the resulting signal is

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Q. The power consumption of a present day colour TV receiver is about

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Q. Consider the following differences between QPSK and MSK

1. The side lobes in MSK are relatively much smaller in comparison to the main lobe
2. The spectrum of MSK has a main centre lobe which is 1.5 times as wide as the main lobe of QPSK
3. The waveforms of both MSK and QPSK exhibit phase continuity

Which of the above statements are correct?

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Q. As per Hartley law

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Q. The speeds used in recording audio programs in house hold recorders are

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Q. During transmission over a communication channel, bit errors occur independently with probability P. If a block of n bits is transmitted, the probability of at most one bit error is equal to

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Q. Assertion (A): In AM carrier component remains constant in amplitude and frequency.

Reason (R): In AM the two side bands are images of each other.

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Q. In tape recorders the hissing noise is due to irregularities in magnetic coating on tape.

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Q. The main advantage of TDM over FDM is

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Q. In FM reception, amplitude disturbances due to static change

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Q. In a colour TV receiver, PAL Dematrix consists of

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Q. For a resistance of about 15 kΩ operating in a frequency range of a few MHz, the noise voltage is in the range of

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Q. In a 50 cm TV tube, a path difference of 2 km between direct wave and interfering wave would mean a displacement between main image and ghost image equal to

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Q. In a colour TV receiver, the sound intercarrier IF is generated in

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Q. Consider the following types of distortions in diode detectors

1. Distortion is caused due to the reason that dc and ac load impedances are unequal
2. Distortion is caused because ac load impedance has a reactive component at high audio frequencies
3. Audio frequency diode current is less than dc current

Which of the above are true?

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Q. Satellites used for international communication are called

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Q. In a phase discriminator fc, is the IF to which primary circuit is tuned. Consider the following statements:
The primary and secondary voltages are

1. exactly 90° out of phase when input frequency is fc
2. more than 90° out of phase when input frequency is higher than fc
3. less than 90° out of phase when input frequency is lower than fc

Which of the above statements is correct?

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