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Important Digital Logic and Design Short Questions

Chapter: 4
Question 1:
What is the Octal equivalent of the binary number 111010110?
Answer: The Octal equivalent of the binary number 111010110 is 726.
Chapter: 4
Question 2:
How is the decimal number 2075 converted to Octal using the repeated division method?
Answer: Divide 2075 by 8 repeatedly until the quotient is 0. The remainders in reverse order give the Octal equivalent: 40338.
Chapter: 4
Question 3:
How can you convert an Octal number to a Decimal number using the sum of weights method?
Answer: Multiply each digit of the Octal number by the corresponding power of 8, then sum the results to get the Decimal equivalent.
Chapter: 4
Question 4:
What is the significance of the Gray code?
Answer: The Gray code is used because it changes only one bit between successive values, reducing the chance of errors in digital systems like shaft encoders.
Chapter: 4
Question 5:
What is the ASCII code used for?
Answer: The ASCII code is used to represent characters and symbols in binary form for computer processing, with 128 unique codes in its 7-bit version.
Chapter: 4
Question 6:
How does the Extended ASCII code differ from the standard ASCII code?
Answer: The Extended ASCII code uses 8 bits, providing 256 unique codes to represent more characters, including graphical symbols.
Chapter: 4
Question 7:
What is the purpose of the parity bit in data transmission?
Answer: A parity bit is used in data transmission to detect errors by checking whether the number of 1s in the data is even or odd, depending on the parity scheme used.
Chapter: 4
Question 8:
What are the two methods to convert a Decimal number to an Octal number?
Answer: The two methods are the Indirect Method (converting first to binary, then to Octal) and the Repeated Division-by-8 Method.
Chapter: 4
Question 9:
What is BCD code, and where is it commonly used?
Answer: BCD (Binary Coded Decimal) code is a 4-bit binary representation of decimal digits, commonly used in digital displays like 7-segment LEDs.
Chapter: 4
Question 10:
How does BCD addition handle sums greater than 9?
Answer: When the sum exceeds 9, the number 6 (0110) is added to correct the result, and any carry is added to the next most significant digit.