An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. 80.9 70.2 113 102.3 TRUE ANSWER : ? YOUR ANSWER : ?
A cordless telephone using separate frequencies for transmission in base and portable units is known as Duplex arrangement Half duplex arrangement Either A or B Neither A nor B TRUE ANSWER : ? YOUR ANSWER : ?
The modulation index of an FM is changed from 0 to 1. How does the transmitted power change? Gets halved Gets increased by 50 percent Remains unchanged Gets doubled TRUE ANSWER : ? YOUR ANSWER : ?
An audio signal (say from 50 Hz to 10000 Hz) is frequency translated by a carrier having a frequency of 106 Hz. The values of initial (without frequency translation) and final (after frequency translation) fractional change in frequency from one band edge to the other are 200 and 10.01 200 and 200 200 and 100.1 200 and 1.01 TRUE ANSWER : ? YOUR ANSWER : ?
To eliminate ghosts in the picture Use a longer transmission line Change the antenna orientation of location Connect a booster Twist the transmission line TRUE ANSWER : ? YOUR ANSWER : ?
SSB can be generated by Good attenuation characteristics All of these Phase cancellation method Filter method TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following does not cause losses in optical fibre cables? Impurities Attenuation in glass Microbending Stepped index operation TRUE ANSWER : ? YOUR ANSWER : ?
What is the purpose of peak clipper circuits in radio transmitters? To prevent overmodulation To reduce bandwidth To regulate oscillator I/P voltage To increase bandwidth TRUE ANSWER : ? YOUR ANSWER : ?
The characteristic impedance of a twin wire feeder used for TV signals is about 300 ohm 100 ohm 1000 ohm 500 ohm TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is a digital modulation technique? PSK All DM PCM TRUE ANSWER : ? YOUR ANSWER : ?