56651. Consider the following differences between QPSK and MSK The side lobes in MSK are relatively much smaller in comparison to the main lobeThe spectrum of MSK has a main centre lobe which is 1.5 times as wide as the main lobe of QPSKThe waveforms of both MSK and QPSK exhibit phase continuity Which of the above statements are correct?
56652. As per Hartley law
56653. The speeds used in recording audio programs in house hold recorders are
56654. 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
56655. In a pulsed RADAR, the transmitter is connected to the antenna
56656. In a CD, the depth and width of each pit is
56657. Which type of modulator amplifier is used in AM transmitter?
56658. Mention the radioactive isotope which is not a pure beta Ray emitter
56659. A digital watch contains
56660. In AM increased depth of modulation increases __________ and in FM with increased depth of modulation __________ increases.
56661. In a DM system, the granular noise occurs when modulating signal
56662. ‘India Against Corruption’ is associated with:?
56663. Huffman code is also known as redundancy code
56664. If each frequency component of f(t) is shifted by p /2, the resulting signal is
56665. A bit synchronizer regenerates at the receiver a clock waveform which is
56666. Probability of error in DPSK is less than PSK
56667. Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectified output will be
56668. Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is
56669. In radar display system PPI stands for
56670. In phase shift keying the input signal is
56671. The intravenous anaesthetic agent used for treating clinical depression is
56672. If Pk be the probability of the message to be received or transmitted, then the amount of information (Ik) associated, in bits, will be
56673. A circuit which cannot demodulate SSB is
56674. In TV system in India IF video and IF audio frequencies are
56675. Assertion (A): The unit of telephone traffic measurement is erlang.Reason (R): International circuits for communication are fitted with echo suppressors.
56676. The ultra short acting muscle relaxant is
56677. The primary colours are
56678. The most commonly used system of modulating for telegraphy is
56679. Which of the following antennas is not wide band?
56680. While AM has __________ frequencies, FM has __________ number of sidebands.
56681. In VHS format diameter of head drum is about
56682. The correct sequence of subsystem in an FM receiver is
56683. A wave is frequency modulated with an index of 0.1 and its frequency is multiplied by 8 times, the modulation index is
56684. Short circuited stubs are preferred to O.C stubs because
56685. When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to
56686. A pre-emphasis circuit provides extra noise immunity by
56687. The ratio for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is
56688. The function of a modulator is to
56689. Which of the following radio waves are not reflected by ionosphere?
56690. Square law modulators utilise
56691. Which of the following is a disadvantage of Vestigial Sideband (VSB) system?
56692. The maximum permissible distance between two samples of a 2 kHz signal is
56693. When the video signal is applied to the picture tube in a TV receiver, the strength of video signal is about
56694. In the above case if the modulating frequency is increased to 20 kHz the bandwidth will be
56695. Assertion (A): In FM all power amplifiers can be operated in class C Reason (R): FM is a constant amplitude modulation system.
56696. In radar system which of the following is called A scope
56697. In a CD the channel separation is
56698. The unit for luminous energy is
56699. The IF bandwidth of a radar receiver is inversely proportional to
56700. If the radiated power of AM transmitter is 10 kW, the power in the carrier for modulation index of 0.6 is nearly.