Q. A high pulse repetition frequency in a radar

View solution

Q. In PCM, the biggest disadvantage as compared to AM is

View solution

Q. Which of the following microphones is the cheapest?

View solution

Q. If a line is terminated in characteristic impedance Z₀, the input impedance measured at the input will be

View solution

Q. In a TV, the output from RF tuner is about

View solution

Q. 24 telephone channels, each band limited to 3.4 kHz, are to be time division multiplexed by using PCM, calculate the bandwidth of PCM system for 128 quantization levels and an 8 KHz sampling frequency

View solution

Q. A signal is sampled at 8 kHz and is quantized using 8 bit uniform quantizer. Assuming SNRq for a sinusoidal signal, the correct statement for PCM signal with a bit rate of R is

View solution

Q. Generally a VCR has

View solution

Q. An antenna has a resistance of 50 Ω and an equivalent noise resistance of 30 Ω The noise figure in decibels is

View solution

Q. An MTI radar operating at 5 GHz has a PRF of 800 pps. The lowest blind speed is

View solution

Q. For maximum output the width of air gap of audio head should be

View solution

Q. The simplest mixer circuit for public address system uses

View solution

Q. PAM stands for

View solution

Q. A Discone antenna is

View solution

Q. In a two tone AM system the two modulating frequencies are 2000 π and 4000 π rad/sec. If carrier frequency is 2π x 10⁶ rad/sec the frequencies of upper sidebands are

View solution

Q. For a system to be designated as hi-fi, the signal to noise ratio should be at least

View solution

Q. Dolby system of noise reduction divides the total audio spectrum into

View solution

Q. In a system an input resistance of 20 kΩ causes a noise voltage of 15μV. If two such input resistances each of 20 kΩ are used in parallel, the total noise voltage will be about

View solution

Q. A sinusoidal signal with peak to peak amplitude of 1.536 volt is quantized into 128 levels using a mid-rise uniform quantizer. The quantization noise power is

View solution

Q. An FM wave is made to pass through a frequency tripler. If original modulation index is mf, the output of tripler has a modulation index equal to

View solution