Digital Logic and Microprocessors

A logic gate is an electronic circuit that performs Boolean logic operations on binary inputs to produce binary outputs - essentially making logic decisions. Option B describes a diode, not a logic gate. Since B is incorrect, 'Both A and B' cannot be correct.

Flip-flops are bistable multivibrators that can store one bit of binary data (0 or 1) in sequential circuits. They are the basic storage elements used in registers, counters, and memory. Unlike hard disks which are storage devices, flip-flops are the actual circuit elements that maintain binary state within digital systems.

One NAN can contain multiple EANs, multiple UPCs, or multiple RACs, not just one. The system allows a NAN to aggregate or be associated with multiple identifiers. The statement that it contains only one of each type is false.

One NAN CAN contain multiple EANs, UPCs, or RAC codes. A single national article number represents all variants and pack sizes of a product, each with its own barcode. The claimed answer (False) correctly identifies that the restriction is not true.

ALU (Arithmetic Logic Unit) is a digital circuit that performs arithmetic and logical operations. It is a fundamental component of a computer's CPU. 'Array' and 'Application' are incorrect expansions.

Both odd parity and even parity bits are used for error detection. Parity bits add an extra bit to make the total number of 1s either odd (odd parity) or even (even parity), helping detect single-bit errors during transmission.

Analog computers process continuous physical signals (electrical voltages, mechanical movements) directly without converting them to digital binary form. They use analog components like operational amplifiers to perform mathematical operations through continuously varying signals. Digital computers must first convert analog inputs to digital form, but analog computers work entirely in the continuous domain.

A flip-flop is a bistable multivibrator circuit that can store one bit of binary information (0 or 1) and is the fundamental building block of memory systems. Rectifiers convert AC to DC, comparators compare voltages, and attenuators reduce signal power - none store data.

In digital logic, an 'inhibitor' is a gate where one input can prevent the output from being active. If one input of an AND gate is inverted (using a NOT gate), that input acts as a control that 'inhibits' the output when it is high.

Both NAND and NOR are universal gates because you can build any logic function (AND, OR, NOT) using only NAND or only NOR gates. This property makes them fundamental in digital circuit design.

Sequential circuits depend on both current inputs and previous states, requiring memory elements (flip-flops) to store state information. Combinational circuits alone cannot remember past inputs. Option A correctly identifies both components are needed.

NAND = AND followed by NOT. In gate symbolism, this is represented as an AND gate with a bubble (inversion circle) at its output. This is called a bubbled AND gate. Alternative equivalent representations include OR with bubbles at all inputs (De Morgan's law), but bubbled AND is the direct representation.

The set {AND, OR} cannot express negation or complement operations, making it functionally incomplete. In contrast, NAND and NOR are each individually complete, and {AND, OR, NOT} is also complete.

Karnaugh maps are a graphical method for simplifying Boolean expressions. They help minimize both the number of gates and the fan-in (inputs per gate) in digital circuits. Option A is incorrect because K-maps aren't specific to flip-flops. Option B is incomplete because K-maps optimize more than just gate count.

Combinational circuits have no memory - their output depends only on the current input values. Sequential circuits, which contain memory elements like flip-flops, can store state information. This is a fundamental distinction in digital circuit design.