Stld Quiz-6 Cse B

The advantage of a J-K flip-flop over an S-R flip-flop is that it has no invalid states. This means that the J-K flip-flop can avoid the possibility of entering a forbidden or undefined state, which can cause unpredictable behavior. In contrast, an S-R flip-flop can enter an invalid state if both the S and R inputs are high, resulting in an indeterminate output. By not having any invalid states, the J-K flip-flop provides more reliable and predictable operation.

Variable Entered Mapping (VEM) is not a mode of Flip Flop representation. The other options, characteristic equations, excitation tables, and truth tables, are commonly used methods to represent and analyze Flip Flops. Characteristic equations express the next state of a Flip Flop in terms of its present state and input, excitation tables provide the input values required to transition between states, and truth tables show the relationship between input and output states. However, Variable Entered Mapping (VEM) is not a recognized mode of Flip Flop representation.

In an S-R latch, when both S and R inputs are set to 1, it creates a forbidden or prohibited state. This state is avoided due to the unpredictable nature of the output. When both inputs are set to 1, it causes the latch to enter into an undefined state where the output becomes unpredictable and can lead to unreliable results. Therefore, this state needs to be avoided in order to maintain the proper functioning and reliability of the S-R latch.

The characteristic equation of an SR latch is a logical expression that describes the behavior of the latch. In this case, the correct answer is "S + R'Qn". This means that the output (Q) of the latch is equal to the logical OR of the inputs S and R'Qn. The prime symbol (') represents the logical NOT operation, so R' means the logical NOT of R. The expression S + R'Qn indicates that the output Q will be set to 1 when S is 1 or when R is 0 and Qn is 1.

Both JK and T flip flops are derived from the basic S R latch. This is because the S R latch is the simplest form of a flip flop, and the JK and T flip flops are modifications of the S R latch. The JK flip flop adds a toggle functionality by incorporating an additional input, while the T flip flop simplifies the input requirements by using a single input. Therefore, the correct answer is Basic S R latch.

When an active-HIGH S-R latch has a 0 on the S input and a 1 on the R input, it is in the RESET state. If the R input goes to 0, it will remain in the RESET state. Therefore, the correct answer is RESET.

Master-slave J-K flip-flops are actually called edge-triggered devices, not pulse-triggered or level-triggered. This is because the input data is read only at the rising or falling edge of the clock pulse, not during the entire time the clock pulse is at a LOW level.

Latches constructed with NOR and NAND gates tend to remain in the latched condition due to cross coupling. Cross coupling refers to the feedback between the inputs and outputs of the latch, which helps to maintain the latched state. This feedback ensures that even if the input voltages change, the latch will continue to hold its state until explicitly reset. This is why latches constructed with NOR and NAND gates are commonly used in memory circuits and other applications where data retention is important.

In a delay flip-flop, the output changes after a certain propagation delay from the input. This means that the output follows the input, indicating that the output changes based on the input signal.

When both inputs of the RS flip flop are set to 0, the output Q is also 0. If a momentary '1' is applied at the input S, it will set the output Q to 1, causing it to flip from 0 to 1. The other input R is still 0, so it does not affect the output. Therefore, the correct answer is that Q will flip from 0 to 1.