56502. The decorative lighting works on the principle of
56503. In an oscillator crystal, the parallel resonant frequency is
56504. The maximum range of a radar is proportional to
56505. In FSK no synchronous carrier is needed at the receiver
56506. The constellation diagram of a modem has four states as shown in the figure given below. What is the bit rate of this modem?
56507. When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant. The modulation system is
56508. Vividh Bharti programme is transmitted in
56509. In a Vidicon camera tube, the beam current is controlled by
56510. Johnson noise is
56511. Which of the following is unlikely to happen when quantising noise is decreased in PCM?
56512. For real and odd signals, the Fourier series coefficient an is
56513. An amplitude modulated wave is
e = 50 (1 + 0.4 cos 1000 t + 0.3 cos 10000 t) cos 107 t
56514. The efficiency of a horn speaker is about
56515. In VCR the luminance signal is recorded by
56516. Assertion (A): In digital communication data is coded prior to being transferred.Reason (R): A number of codes for digital data processing are available.
56517. In FM modulation pre-emphasis is done for
56518. c(t) and m(t) are used to generate an AM signal. The modulation index of the generated AM signal is 0.5 then the quantity
is
56519. High intermediate frequency in a superheterodyne receiver
56520. The number of repeaters in a coaxial cable link depends on
56521. The overall noise temperature Te, absolute temperature T and noise figure F are related as
56522. In binary data transmission DPSK is preferred to PSK because
56523. A basic group B
56524. By the use of which of the following the PPM can be converted to PWM?
56525. Frequency shifting keying is basically a method involving
56526. Which of the following codes provides parity checks?
56527. PA radar means
56528. Dynamic range of hi-fi system is at least
56529. A band limited signal is sampled at the Nyquist rate. The signal can be recovered by passing the samples through
56530. The seven segment display used in watches and clocks generally uses
56531. If e = 10 sin(108 t + 3 sin 104 t) then modulating frequency is
56532. When a signal is quantized such that the step size S is small in comparison with the peak to peak range of the signal, the mean square quantization error is equal to
56533. Assertion (A): Many times a radar cannot detect 'grounding hopping' military aircraft.Reason (R): Ground interference limits the range of radar.
56534. Entropies associated with an extremely unlikely message and that with an extremely likely message are respectively
56535. In push button type telephone set, pressing a button generates
56536. If sound wave has an intensity of 10 Pa. The dB level is about
56537. The intermediate frequencies in VCR are
56538. Assertion (A): In TV scanning is done from left to right and top to bottom. Reason (R): Interlaced scanning is useful in eliminating flicker
56539. The unit of loudness is
56540. To couple a coaxial line to a parallel line wire it is best to use
56541. The total bandwidth needed for an AM signal at 55.25 MHz with 0.5 MHz video modulation is
56542. Peripheral Vascular Occlusion is a contra indication for one of the following modality
56543. In PM, without any modulation, all the transmitted pulses have the same
56544. Colour picture tube needs higher anode voltage and needs larger beam and cathode currents than monochrome tube because
56545. In frequency modulation noise can be further reduced by
56546. Which one of the following is digital?
56547. Automatic sensitivity control by target voltage control is easily possible in
56548. All of the following are ethological factors for development of cancer of oropharynx Except
56549. In a colour TV receiver SAW filter consists of