Communication Skill Set 4

Q1 | FM transmitting and receiving equipment as compared to AM equipment is

Q2 | 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

Q3 | If in a broadcasting studio, a 1000 kHz carrier is modulated by an audio signal of frequency range 100-5000 kHz, the width of channel is __________ kHz.

Q4 | Which one of the following is analog?

Q5 | The disadvantage of FM over AM is that

Q6 | Which of the following is a digital modulation technique?

Q7 | Which of the following is used to generate PDM?

Q8 | SSB can be generated by

Q9 | A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be

Q10 | What is the purpose of peak clipper circuits in radio transmitters?

Q11 | In case of low level amplitude modulation system, the amplifiers following the modulated stage must be

Q12 | Under ordinary circumstances, impulse noise can be reduced in

Q13 | In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then

Q14 | If sampling is done at the rate of 10 kHz. The bandwidth required is

Q15 | It is found that a ship to ship communication suffers from fading. This can be avoided by using

Q16 | In practical commercial FM system, channel bandwidth is

Q17 | In EM waves, polarization

Q18 | The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

Q19 | PAM stands for

Q20 | The characteristic impedance of a twin wire feeder used for TV signals is about

Q21 | In a FM receiver, amplitude limiter

Q22 | A buffer amplifier is

Q23 | Leak type bias is used in plate modulated class C amplifier to

Q24 | The direction of rotation of a CD is

Q25 | One of the advantages of base modulation over collector modulation of a transistor class C amplifier is