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[SOWHAT0819]

Which is not true about CRC 12?
Show answer choices
A. none of the choices
B. to determine the CRC remainder, the data is appended with 12 0's then divided by the CRC dividing polynomial
C. the CRC remainder is consisting of 12 bits
D. the CRC 12 dividing polynomial is consisting of 12 bits
E. the transmitted signal is the original data with the appended CRC.


Given CRC 12 and implementing it as a dividing circuit, how many XOR logic gates (not the number of IC) are needed?

A. 13
B. 5
C.12
D.12

In a CRC dividing circuit what is the purpose of the shift register?

Show answer choices
A.it serves as the input
B.none of the choices
C.its is used for synchronization
D.as a storage device
E.to power up the circuit


Which M-ary encoding technique uses 4-bit input

Show answer choices
A.QPSK
B. BPSK
C. 16PSK
D. 8QAM


Given CRC 12 and implementing it as a dividing circuit the 1st XOR block in the circuit performs XOR between


Show answer choices
A.the data input and the 1st shift register block
B.the 1st and 2nd shift register block
C.the data input and the last shift register block
D.the first and the last shift register block



In the CRC dividing circuit, synchronization is provided by

Show answer choices
A. XOR
B. shift registers
C. switches
D. 555 timer


Which digital modulation technique is the baud rate not equal to its bit rate?

Show answer choices
FSk
QPSK
BPSK
ASK




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[🤖]

Which is not true about CRC 12?

Answer: D. the CRC 12 dividing polynomial is consisting of 12 bits

Explanation: The CRC 12 dividing polynomial is not consisting of 12 bits. Instead, it is a 13-bit polynomial.

Given CRC 12 and implementing it as a dividing circuit, how many XOR logic gates (not the number of IC) are needed?

Answer: C. 12

Explanation: In a CRC dividing circuit, the number of XOR logic gates needed is equal to the degree of the polynomial, which is 12 in the case of CRC 12.

In a CRC dividing circuit what is the purpose of the shift register?

Answer: D. as a storage device

Explanation: The shift register in a CRC dividing circuit is used as a storage device to hold the data being divided and the intermediate remainders.

Which M-ary encoding technique uses 4-bit input?

Answer: C. 16PSK

Explanation: 16PSK is an M-ary encoding technique that uses a 4-bit input. QPSK and BPSK use 2-bit input, and 8QAM uses 3-bit input.

Given CRC 12 and implementing it as a dividing circuit, the 1st XOR block in the circuit performs XOR between

Answer: A. the data input and the 1st shift register block

Explanation: The first XOR block in a CRC dividing circuit performs XOR between the data input and the first shift register block.

In the CRC dividing circuit, synchronization is provided by

Answer: B. shift registers

Explanation: Shift registers are used in a CRC dividing circuit to provide synchronization between the data input and the XOR gates.

Which digital modulation technique is the baud rate not equal to its bit rate?

Answer: A. FSK

Explanation: In Frequency Shift Keying (FSK), the baud rate is not equal to the bit rate because each symbol represents more than one bit of information. QPSK, BPSK, and ASK have the same baud rate as their bit rate.