Q. The received signal frequency at any time of a super-heterodyne receiver having IF = 456 kHz is 1 MHz. The corresponding image signal is

View solution

Q. A 300 Hz sound wave of intensity 20 dB is transmitted by a 1500 kHz radio wave by frequency modulation. It is seen that instantaneous frequency varies between 1500.2 kHz and 1499.8 kHz, 300 times a second. If the intensity of sound wave is 100 dB.

View solution

Q. If the average power of radar transmitters is 2 kW and the peak power of the transmitter is 1000 kW, what will be the duty cycle?

View solution

Q. An analog signal is band limited to B Hz sampled at Nyquist rate and samples are quantized into 4 levels each with probability 1/4. The information rate is

View solution

Q. The HV supply to a TV receiver is 25 kV and the total beam current for the three electron guns is 2000 μA. The power handled by IHVT is

View solution

Q. The antenna diameter of a radar system is doubled. The maximum range will

View solution

Q. Which of the following microphones works on the piezoelectric effect?

View solution

Q. In PAL system weighting of R - Y and B - Y signals is done to

View solution

Q. In case of probability of the message is 1 to 16 then the information will be

View solution

Q. The saving of power in DSB-SC modulated at 80% is

View solution

Q. In a perfect conductor the resistor noise is

View solution

Q. An RF carrier of 12 kV at 1 MHz is amplitude modulated by 1 kHz signal having peak value of 6 kV. The modulation pattern is seen on CRO screen. The voltage indicated will be

View solution

Q. In push pull amplifier, each transistor conducts for

View solution

Q. In the television system in India, each channel is allowed a bandwidth of

View solution

Q. A diode detector load consists of 0.01 μF capacitor in parallel with a 5 k ohms resistor. The maximum depth of modulation without diagonal clipping at modulating frequency of 1000 Hz and 10 kHz is

View solution

Q. In the television system in India, each frame is scanned

View solution

Q. Each kilometer of travel in electromagnetic radiation means a time delay of

View solution

Q. A video monitor is exactly similar to TV receiver.

View solution

Q. A RADAR can be used to

View solution

Q. In single tone AM modulation, the transmission efficiency for m = 1 is

View solution