Analog Communications Multiple Choice Questions focuses on “Reduction of Noise”.
1. Luminance is measured in ________
a) Decibels
b) IRE units
c) Lumins
d) NTSC units
Answer: b
Clarification: Luminance refers to brightness. It is a photometric measure of luminous intensity per unit area of light travelling in a given direction. It is measured in IRE units.
2. The maximum luminance level is called ________
a) max white
b) peak white
c) all white
d) full white
Answer: b
Clarification: Luminance refers to brightness. It is a photometric measure of luminous intensity per unit area of light travelling in a given direction. It is measured in IRE units. The maximum luminance level is called peak white.
3. Which term is used for defining high and low points of a satellite’s orbit?
a) crest and trough
b) apogee and perigee
c) uplink and downlink
d) peak and sink
Answer: b
Clarification: Apogee and Perigee are respectively the terms used for defining high and low points of a satellite’s orbit.
4. What is the power order of power level for an earth station to transmit to a satellite?
a) 104 watts
b) 103 watts
c) 100 watts
d) 101 watts
Answer: b
Clarification: The standard power level of an earth station to transmit to a satellite is of the order of 103 Watts.
5. What is the full form of DBS?
a) direct broadcast satellite
b) decibels of signal
c) direct beam signal
d) direct broadcast signal
Answer: a
Clarification: DBS stands for direct broadcast satellite. In Direct Broadcast Satellite subscribers receives signal directly from geostationary satellite.
6. RCC stands for __________
a) Radio Common Carrier
b) Radio Central Carrier
c) Radio Control Carrier
d) Radio Cell Carrier
Answer: a
Clarification: RCC stands for Radio Common Carrier. It was introduced in 60’s. Like a radio it can also transmit voice communication through a push to talk system. But it used a public telephone network and has its own telephone number.
7. Current PCs are referred as __________
a) first-generation
b) second-generation
c) third-generation
d) fourth-generation
Answer: b
Clarification: Current PCs in today’s time are referred as second generation.
8. ISM stands for _________
a) IEEE Standard Message
b) Industrial, Scientific and Messaging
c) Industrial, Scientific and Medical
d) IEEE Secure Message
Answer: c
Clarification: ISM stands for Industrial, Scientific and Medical. In it some radio frequencies are only used for Industrial, Scientific and Medical purposes not for telecommunications purpose. Bluetooth uses ISM band.
9. Bluetooth uses ________
a) CDMA
b) Frequency hopping
c) QPSK
d) QAM
Answer: b
Clarification: Bluetooth is a wireless technology. It is used for exchanging data over short distances. It usually uses frequency hopping, in which the transmitter changes the carrier frequency with respect to a specific pattern.
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