Theory_Questions:
1) What is bandwidth of T.V Signal ?
(a) 3.4 KHz
(b) 4.5 KHz
(c) 4.5 MHz
(d) Depends on Data rate
Answer: [C] 4.5 MHz
2) What is bandwidth of Data Signal?
(a) 3.4 KHz
(b) 4.5 KHz
(c) 4.5 MHz
(d) Depends on Data rate
Answer: [D] Depends on
Data rate
3) What is power of Speech Signal
(voice signal) at zero frequency?
(a) 3.4 dB
(b) 10 dB
(c) 0 dB
(d) 100 dB
Answer: [C] 0 dB
4) In which frequency band the
disturbance due to lighting discharge is more ?
(a) 3KHz-30KHz
(b) 3MHz-30MHz
(c) 300KHz-3MHz
(d) 30KHz-300KHz
Answer: [A] 3KHz-30KHz
5) For F.M broad casting (88MHz-108MHz)
which of the following is used ?
(a) Ground wave propagation
(b) Line of sight
(c) Sky wave propagation
(d) Ionospheric propagation
Answer: [B] Sky wave
propagation
6) In the following which is/are the
benefits of modulation?
(a) Frequency of translation
(b) To reduce the antenna height
(c) both 1 and 2
(d) none of the above
Answer: [C] both 1 and 2
7) In a communication system used for
public address system which is used as output transducer ?
(a) micro phone
(b) power amplifier
(c) loud speaker
(d) photo detector
Answer: [C] loud speaker
8) In the following which is the
internal noise ?
(a) lighting discharge
(c) impulse noise
(b) shot noise
(d) radio frequency interference
Answer: [B] shot noise
9) Impulse noise is severe which of the
following signal?
(a) Analog signal
(c) both 1 & 2
(b) Digital signal
(d) none of the above
Answer: [B] both 1 & 2
10) In analog signal one complete cycle
is called time period, then in digital signal one complete signal is
called as..
(a) period
(b) bit rate
(c) bit interval
(c) bit period
Answer: [C] bit interval
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