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Communication systems
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q1 ⇒ FM transmitting and receiving equipment as compared to AM equipment is costly [other wrong options] [Discuss in forum] cheaper almost equally costly none of the above |
Q2 ⇒ Telecine equipment in a TV studio consists of none of the above [other wrong options] [Discuss in forum] projector telecine flying spot telecine digital CCD telecine |
Q3 ⇒ PCM : Quantising Noise :: Transistor : Partition noise [other wrong options] [Discuss in forum] Shot noise Whirl No noise |
Q4 ⇒ The number of bits of information required to indicate the correct selection of 3 independent consecutive events out of 75 equally probable events is 18.69 [other wrong options] [Discuss in forum] 6.23 10.46 24.92 |
Q5 ⇒ What is the purpose of peak clipper circuits in radio transmitters? To prevent overmodulation [other wrong options] [Discuss in forum] To reduce bandwidth To increase bandwidth To regulate oscillator I/P voltage |
Q6 ⇒ An MTI radar operating at 5 GHz has a PRF of 800 pps. The lowest blind speed is 48 m/s [other wrong options] [Discuss in forum] 96 m/s 192 m/s 24 m/s |
Q7 ⇒ For low impedance SAW filter the most suitable material for substrate of SAW filter is PZT ceramics [other wrong options] [Discuss in forum] ZnO Lithium titanate Lithium neobate |
Q8 ⇒ The inductance of connecting leads can be a source of high frequency parasitics [other wrong options] [Discuss in forum] low frequency parasitics carrier frequency parasitics none of the above |
Q9 ⇒ The maximum power output of a standard A earth station over the total band allocated to satellite communication is about 0.5 kW [other wrong options] [Discuss in forum] 8 kW 20 kW 50 kW |
Q10 ⇒ A Discone antenna is a combination of disk and cone in close approximity [other wrong options] [Discuss in forum] a combination of disk and cone at λ/4 spacing a combination of disk and cone far apart a combination of disk and cone at λ/2 spacing |
Q11 ⇒ Which one of the following is analog? PWM [other wrong options] [Discuss in forum] PCM Delta modulation Differential PCM |
Q12 ⇒ Consider the following statements
1, 2 and 3 only [other wrong options] [Discuss in forum] 1 only 1, 2, 3, 4 1 and 3 only |
Q13 ⇒ In a TV receiver antenna the length of reflector rod is more than that of dipole [other wrong options] [Discuss in forum] is the same as that of dipole is less than that of dipole may be equal, more or less than that of dipole |
Q14 ⇒ The typical squelch circuit cuts off audio amplifier when carrier is absent [other wrong options] [Discuss in forum] cuts off IF amplifier when AGC is minimum cuts off IF amplifier when AGC is maximum eliminates RF interference when signal is weak |
Q15 ⇒ In case of frequency modulation, modulating voltage remains constant if the modulating frequency is lowered, then amplitude of distant sidebands increases [other wrong options] [Discuss in forum] amplitude of distant sidebands decreases amplitude of distant sidebands remains constant amplitude of distant sidebands first increases, then decreases |
Q16 ⇒ ARQ stands for Automatic Repeat Request [other wrong options] [Discuss in forum] Automatic Repeat Quest Analog Repeat Request None Of the above |
Q17 ⇒ An FM signal has modulating frequency fm and maximum frequency deviation of δ. The bandwidth will be nearly equal to 2 δ [other wrong options] [Discuss in forum] δ 2fm δ fm δ |
Q18 ⇒ Consider the draw backs
1 and 3 only [other wrong options] [Discuss in forum] 1 and 2 only 2 and 3 only 1, 2, 3 |
Q19 ⇒ In a FM receiver, amplitude limiter eliminates any change in amplitude of received FM signals [other wrong options] [Discuss in forum] amplifiers low frequency signals reduces the amplitude of signals none of the above |
Q20 ⇒ Assertion (A): Radar gave birth to microwave technology. Reason (R): In radar systems very high frequencies give the most accurate results. Both A and R are correct and R is correct explanation of A [other wrong options] [Discuss in forum] Both A and R are correct but R is not correct explanation of A A is correct but R is wrong A is wrong but R is correct |
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