Q. If B is the bandwidth, the thermal noise voltage is proportional to

View solution

Q. ARQ stands for

View solution

Q. MTSO stands for

View solution

Q. The main advantage of TDM over FDM is that it

View solution

Q. VLF waves are sometimes used because

View solution

Q. Which of the following is very useful as multiband HF receiving antenna?

View solution

Q. Assertion (A): A video monitor does not need RF tuner and IF amplifier

Reason (R): The picture tube in TV is basically a CRT.

View solution

Q. Consider the following statements as regards IF in radio receivers

1. If IF is too high, poor selectivity and poor adjacent channel rejection could result
2. If IF is high, tracking difficulties increase
3. A very low IF makes selectivity too sharp
4. As IF is decreased, image frequency rejection becomes better

Which of the above are correct?

View solution

Q. Audio-signal modulates a 125 MHz carrier, causing a frequency deviation of 5 kHz. The bandwidth of the narrowband FM signal is __________ kHz.

View solution

Q. Assertion (A): Radar gave birth to microwave technology.

Reason (R): In radar systems very high frequencies give the most accurate results.

View solution

Q. A channel has a SNR of 7 and BW 4 kHz. Keeping the channel capacity (BPS) same, the BW is reduced to accommodate more channels. The SNR

View solution

Q. In amplitude modulation the rms value of radio frequency voltage after 40% modulation is 60 mV. If modulation is 80% the rms value after modulation will be about

View solution

Q. 1 GHz is equal to

View solution

Q. Consider the following statements

1. In a pulsed radar, the transmitted pulses are of high frequency
2. In a pulsed radar, the transmitted pulses are of high power
3. In a pulsed radar, the transmitted pulses are of brief duration
4. In a pulsed radar, the transmitted pulses are of square wave shape.

Of the above statements the correct statements are

View solution

Q. Probability density function of thermal noise is

View solution

Q. In a colour TV receiver AFT stands for

View solution

Q. The smallest change in sound intensity that can be detected by human ear is __________ dB.

View solution

Q. Low frequency boost can be easily compensated by

View solution

Q. An MTI compares a set of received echos with those received during the previous sweep.

View solution

Q. If e = 10 sin(10⁸ t + 3 sin 10⁴ t) then the deviation is

View solution