# Analog Communications Questions and Answers – Phase Comparator

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This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Phase Comparator”.

1. The velocity required to stay in orbit is ________
a) constant
b) infinite
c) lower close to the earth than far from the earth
d) higher close to the earth than far from the earth

Explanation: The velocity in orbit must be higher close to the earth than far from the earth. Then only components can stay in orbit.

2. An antenna is adjusted by adjusting the two “look angles” called _________
a) coverage and elevation
b) declination and elevation
c) azimuth and declination
d) azimuth and elevation

Explanation: Azimuth and Elevation are two look angles of any antenna. So any antenna can be adjusted by adjusting these two angles properly.

3. PCS stands for ________
a) Portable Control Service
b) Personal Communication Systems
c) Personal Control Signal
d) Portable Communication Systems

Explanation: PCs stands for Personal Communication Systems. It is a wireless phone service similar to cellular service but emphasizing on personal service and extending mobility.
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4. What is the full form of MIN?
a) Multistage Interconnection Network
b) Mobile Identification Number
c) Maximum In-band Noise
d) Minimum In-band Noise

Explanation: MIN stands for Mobile Identification Number. It refers to the 10 digit unique number that a wireless carrier uses to identify a mobile phone.

5. Which term is used for voice channels, in GSM?
a) traffic channels
b) noise channels
d) transmitter channels

Explanation: Traffic channel is the term used for voice channels, in GSM.
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6. Pagers use _________
a) VHF band
b) UHF band
c) Both VHF and UHF bands
d) HF band

Explanation: A pager is a telecommunication device that receives alert signals and short messages. It can use both UHF and VHF band.

7. What is the approximate IEEE specification covering wireless LANs?
a) 802.13
b) 802.12
c) 802.11
d) 802.10

Explanation: 802.11 is the approximate IEEE specification for covering wireless LANs. LAN stands for Local Area Network, which connects multiple devices sharing a common network or being connected to the same server.

8. TDD stands for _________
a) Time Division Duplex
b) Time Delayed Duplex
c) Telecommunication Display Device
d) Time Definite Delivery

Explanation: TDD stands for Time Division Duplex. It refers to duplex communication links where uplink is separated from downlink. They are separated by allocating them different time slots in the same frequency band.

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