Combinational Circuits DSD Test

What is the function of a NOT gate?

• The function of a NOT gate is to invert the input signal.

• The function of a NOT gate is to amplify the input signal.

• The function of a NOT gate is to combine multiple input signals.

• The function of a NOT gate is to pass the input signal unchanged.

How many inputs can a 4-to-1 multiplexer have?

• 16

• 4

• 2

• 8

What is the primary purpose of a demultiplexer?

• To combine multiple inputs into a single output.

• To route a single input to multiple outputs based on select lines.

• To amplify a signal for better transmission.

• To store data temporarily before processing.

Define the function of an encoder in digital circuits.

• An encoder splits a binary code into multiple output signals.

• An encoder amplifies input signals for transmission.

• An encoder stores data in a non-volatile memory.

• An encoder converts multiple input signals into a binary code output.

What is the difference between a decoder and an encoder?

• An encoder compresses data, while a decoder expands it.

• A decoder encrypts data, while an encoder decrypts it.

• An encoder converts data into a specific format, while a decoder converts it back to its original format.

• An encoder and decoder perform the same function in data transmission.

How does a half adder differ from a full adder?

• A half adder can perform subtraction; a full adder cannot.

• A half adder is used for binary multiplication; a full adder is used for addition.

• A half adder has two inputs; a full adder has three inputs.

• A half adder has a carry output; a full adder does not.

What is the output of a 2-bit comparator when both inputs are equal?

• Greater

• Equal

• Lesser

• Undefined

Explain the role of a full subtractor in binary subtraction.

• A full subtractor only works with positive integers.

• A full subtractor performs binary subtraction of two bits, accounting for a borrow bit.

• A full subtractor is used for converting binary to decimal.

• A full subtractor adds two bits and ignores any borrow.

What is the main characteristic of combinational circuits?

• The output depends on previous inputs.

• The output depends only on the current inputs.

• The output is determined by a clock signal.

• The output is constant regardless of inputs.

How do sequential circuits differ from combinational circuits?

• Sequential circuits only use current inputs for their output.

• Combinational circuits can store data while sequential circuits cannot.

• Sequential circuits differ from combinational circuits in that they have memory elements and depend on past states, while combinational circuits do not and rely only on current inputs.

• Sequential circuits are faster than combinational circuits.