Explore topic-wise MCQs in Digital Electronics.

This section includes 22 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Electronics knowledge and support exam preparation. Choose a topic below to get started.

1.

Determine odd parity for each of the following data words: 1011101        11110111        1001101

A. P = 1, P = 1, P = 0
B. P = 0, P = 0, P = 0
C. P = 1, P = 1, P = 1
D. P = 0, P = 0, P = 1
Answer» E.
2.

A parity checker is constructed in the same way as a parity generator, except that in a 4-bit system there must be five inputs, and the output is used as the error indicator.

A. 1
B.
Answer» B.
3.

The Ex-NOR is sometimes called the equality gate.

A. 1
B.
Answer» B.
4.

In a parity generator circuit, an error is signaled on an error indicator.

A. 1
B.
Answer» C.
5.

Parity generator and checker circuits are available in single IC packages.

A. 1
B.
Answer» B.
6.

Electrical noise does not affect the transmission of binary information.

A. 1
B.
Answer» C.
7.

The exclusive-OR is written in a Boolean equation as a plus sign with a circle around it.

A. 1
B.
C. 1
D.
Answer» B.
8.

Show from the truth table how an exclusive-OR gate can be used to invert the data on one input if the other input is a special control function.

A. Using A as the control, when A = 0, X is the same as B. When A = 1, X is the same as B.
B. Using A as the control, when A = 0, X is the same as B. When A = 1, X is the inverse of B.
C. Using A as the control, when A = 0, X is the inverse of B. When A = 1, X is the same as B.
D. Using A as the control, when A = 0, X is the inverse of B. When A = 1, X is the inverse of B.
Answer» C. Using A as the control, when A = 0, X is the inverse of B. When A = 1, X is the same as B.
9.

The exclusive-OR provides a LOW input if one input or the other input is HIGH.

A. 1
B.
Answer» C.
10.

Which type of gate can be used to add two bits?

A. Ex-OR
B. Ex-NOR
C. Ex-NAND
D. NOR
Answer» B. Ex-NOR
11.

Why is an exclusive-NOR gate also called an equality gate?

A. The output is false if the inputs are equal.
B. The output is true if the inputs are opposite.
C. The output is true if the inputs are equal.
Answer» D.
12.

In an exclusive-OR, both inputs cannot be HIGH to provide a HIGH output.

A. 1
B.
Answer» B.
13.

Using the CPLD design environment, we can simulate any combinations of inputs and observe the resulting output to check for proper circuit operation.

A. 1
B.
Answer» B.
14.

Determine odd parity for each of the following data words: 1011101        11110111        1001101

A. P = 1, P = 1, P = 0
B. P = 0, P = 0, P = 0
C. P = 1, P = 1, P = 1
D. P = 0, P = 0, P = 1
Answer» E.
15.

Identify the type of gate below from the equation

A. Ex-NOR gate
B. OR gate
C. Ex-OR gate
D. NAND gate
Answer» D. NAND gate
16.

A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

A. Ex-NOR gate
B. OR gate
C. Ex-OR gate
D. NAND gate
Answer» D. NAND gate
17.

The Ex-NOR is sometimes called the ________.

A. parity gate
B. equality gate
C. inverted OR
D. parity gate or the equality gate
Answer» C. inverted OR
18.

The odd/even parity system would require a sixth bit to be added to a 4-bit system.

A. 1
B.
C. 1
D.
Answer» C. 1
19.

How is odd parity generated differently from even parity?

A. The first output is inverted.
B. The last output is inverted.
Answer» C.
20.

Parity systems are defined as either________ or ________ and will add an extra ________ to the digital information being transmitted.

A. positive, negative, byte
B. odd, even, bit
C. upper, lower, digit
D. on, off, decimal
Answer» C. upper, lower, digit
21.

A logic circuit that provides a HIGH output for both inputs HIGH or both inputs LOW is a(n):

A. Ex-NOR gate
B. OR gate
C. Ex-OR gate
D. NAND gate
Answer» B. OR gate
22.

Select the statement that best describes the parity method of error detection:

A. Parity checking is best suited for detecting double-bit errors that occur during the transmission of codes from one location to another.
B. Parity checking is not suitable for detecting single-bit errors in transmitted codes.
C. Parity checking is best suited for detecting single-bit errors in transmitted codes.
D. Parity checking is capable of detecting and correcting errors in transmitted codes.
Answer» D. Parity checking is capable of detecting and correcting errors in transmitted codes.