Q. VSB modulation is preferred in TV because

View solution

Q. A woofer should be fed from the input through a

View solution

Q. It is desired that transmission line and load should match for a range of frequencies. The best method is

View solution

Q. Which of the following has the highest input impedance?

View solution

Q. In a fascimile reproduction time to scan one line is 2 ms. If it has 4% blanking, the visible trace time is

View solution

Q. Consider the following statements

1. The amplitude of an FM wave is constant
2. FM is more immune to noise than AM
3. FM broadcasts operate in upper VHF and UHF frequency ranges
4.FM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments

Which of the above are correct?

View solution

Q. Signal to noise ratio of microphone is defined as the ratio of output when the sound pressure is __________ to the output in the absence of any sound signal.

View solution

Q. Fields are said to be circularly polarised if their magnitudes are

View solution

Q. Three analog signals, having bandwidths 1200 Hz, 600 Hz, 600 Hz are sampled at their Nyquist rates, encoded with 12 bit words, and time division multiplexed. The bit rate for the multiplexed signal is

View solution

Q. In a CD player the speed of CD is

View solution

Q. In the output of a DM speech encoder, the consecutive pulses are of opposite polarity during time interval t1 < t < t2. This indicates that during this interval

View solution

Q. A fascimile reproduction has a specification of 200 lines per frame, progressive scanning and 5 frames per second. The time to scan one line is

View solution

Q. Sound waves are electromagnetic waves.

View solution

Q. In major diatonic musical scale, an octave is divided into

View solution

Q. The bandwidth of DSB suppressed carrier modulation system when the modulating frequency varies between 500 Hz and 5 kHz is

View solution

Q. The filter circuit for feeding a wooffer has

View solution

Q. In an FM system, when the AF is 500 Hz and the AF voltage is 2.4 V, the deviation is 4.8 kHz. If the AF voltage is now increased to 7.2 V, the new deviation will be

View solution

Q. Modulation is also called detection.

View solution

Q. The maximum range of a transmitter depends on

View solution

Q. Consider the following statements about Yagi Uda antenna

1. It is unidirectional
2. Its gain is about 7 dB
3. It is used at VLF
4. The optimum separation is 0.11

Which of the above are correct?

View solution