Q. A digital watch contains

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Q. A monostable multivibrator is used to generate PWM because it can

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Q. Consider the following statements in amplitude modulation

1. The harmonic and intermodulation distortion may occur in audio and RF amplifiers
2. The sum and difference frequencies are present in the output of mixer
3. The diode detector has audio frequencies in its output
4. A balanced modulator cannot produce an AM with suppressed carrier

Which of the above are true?

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Q. A resistor R is in parallel with capacitance C. The rms noise voltage of resistor in the equivalent circuit can be written as

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Q. Assertion (A): In angle modulation the transmitted amplitude is constant.

Reason (R): Angle modulation has good immunity to noise and interference.

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Q. A 1000 kHz carrier is simultaneously modulated with 300 Hz, 800 Hz and 2 kHz audio sine waves. The frequencies present in the output will be

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Q. In a certain '12 channel TDM' system it is found that channel no. 3 and channel no. 8 are connected to the same input signal. This technique

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Q. Which wave is also called surface wave?

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Q. ADM stands for

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Q. The atmospheric absorption of radio waves depends on

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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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