Question

In the context of error detection in satellite transmission, ARQ stands for
A. Automatic Repeat Request
B. Automatic Relay request
C. Accelerated recovery request
D. Automatic radiation quenching

Answer 1

Hint: ARQ is a scheme proposed for satellite communications. It is an error control mechanism for data transmission.

Complete answer:
Automatic repeat request (ARQ), also known as automatic repeat query, is an error-control method for data transmission that uses acknowledgements (messages sent by the receiver indicating that it has correctly received a packet) and timeouts (specified periods of time allowed to elapse before an acknowledgment is to be received) to achieve reliable data transmission over an unreliable communication channel.
Automatic relay request is a wrong option for error detection in satellite transmission
It’s not Accelerated recovery request, it's actually ARP (Accelerated Recovery Performance) is a system comprising proprietary technology and protocols that uses a patented bio-electrical current simultaneously with active range-of-motion and other exercise techniques to significantly speed up the body’s natural recuperative ability.
In Automatic radiation quenching, when the luminosity of the proton-injected γ−rays grows sufficiently, this high-energy radiation is automatically quenched.

Hence the correct answer is option A.

Note: In an ARQ scheme, the receiver uses an error detection code, typically a Cyclic Redundancy Check (CRC), to detect whether the received packet is in error. If an error is detected, the receiver discards the packet and sends a negative acknowledgement to the transmitter, and requests a re-transmission.