Q. Which of the following is correct (FDM means Frequency Division Multiplexing and TDM means Time Division Multiplexing)?

View solution

Q. Consider the following applications/ advantages of radar beacons

1. navigation
2. target identification
3. accurate tracking of enemy targets
4. large increase in maximum range

Which of the above are correct?

View solution

Q. The signal plate of vidicon tube is coated with tin oxide.

View solution

Q. The maximum permissible distance between two samples of a 10 kHz signal

View solution

Q. In telephone systems, load is expressed in the unit of

View solution

Q. Which of the following can be used to convert PPM into PWM?

View solution

Q. For an antenna of height ht metres, the radio horizon is equal to

View solution

Q. If in a radio receiver, RF signal has a frequency of 800 kHz and local oscillator that of 1000 kHz, then at the output of the mixer, the frequencies found would be __________ kHz.

View solution

Q. In the stabilized reactance modulator AFC system

View solution

Q. In AM, the modulation envelope has a peak value double the unmodulated carrier level, when the modulation is

View solution

Q. A bit synchronizer regenerates at the receiver a clock waveform which is

View solution

Q. Probability of error in DPSK is less than PSK

View solution

Q. Zero mean Gaussian noise of variance N is applied to a half wave rectifier. The mean squared value of the rectified output will be

View solution

Q. Two sine waves of amplitude A1 and A2 are multiplied. The amplitude of the spectral component is

View solution

Q. In radar display system PPI stands for

View solution

Q. When ωm is the modulation frequency in frequency modulation, the modulation index is proportional to

View solution

Q. A pre-emphasis circuit provides extra noise immunity by

View solution

Q. The function of a modulator is to

View solution

Q. Which of the following radio waves are not reflected by ionosphere?

View solution

Q. Square law modulators utilise

View solution