Q. Assertion (A): CCIR-B system has 625 scanning lines per frame and 2 : 1 interlace.

Reason (R): The aspect ratio is 4 : 3

View solution

Q. At night the ionosphere can be considered to be consisting of

View solution

Q. A balun transformer gives an impedance transformation of

View solution

Q. Which one of the following is true?

View solution

Q. A 1000 kHz carrier wave modulated 40% at 40000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulator after transmission through the circuit?

View solution

Q. The EHT voltage in a picture tube of TV is

View solution

Q. Assertion (A): For satellites and space probes, PRF of a radar is pretty low.

Reason (R): PRF of a radar depends on the range of a radar.

View solution

Q. An S/N ratio of 3 expressed in db is

View solution

Q. The material used for the magnet of moving coil cone type loudspeaker is

View solution

Q. CCIR system B employs

View solution

Q. The power to the base unit of a cordless telephone is supplied by

View solution

Q. In cellular telephone each cell is designed to handle

View solution

Q. A UPS contains

View solution

Q. A transmitter power of 10 W is increased by 30 dB. The effective radiated power is

View solution

Q. It is desired to couple a coaxial line to a two parallel wire line. It is best to use

View solution

Q. 24 telephone channels are frequency division multiplexed using an SSB modulation. Assuming 3 kHz per channel, the required band width is

View solution

Q. If velocity of sound waves in air at 0°C is 330 m/s, the velocity at 40°C is about

View solution

Q. A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is

View solution

Q. In FM, as bandwidth increases

View solution

Q. A 400 W carrier is amplitude modulated with m = 0.75. If single side band suppressed carrier is used the total power in modulated wave is

View solution