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It is only activated by a negative level triggerĬ. It is only activated by a positive level triggerī. The S-R latch composed of NAND gates is called an active low circuit because _Ī. Either positive or Negative edge triggerĬlarification: Flip flops can be activated with either a positive or negative edge trigger.ħ. Whereas, in flip-flops there is an additional state known as Forbidden State.Ħ. How many stable states combinational circuits have?Ĭlarification: The two stable states of combinational circuits are 1 and 0. Whereas, in case of combinational circuits, they only depend on the present state.ĥ. They depend on the past as well as present states. The flip-flop depends on the past as well as present statesĬlarification: Both flip-flop and latches are memory elements with clock/control inputs. The only difference between a combinational circuit and a flip-flop is that _ĭ. So, in J-K flip-flop J=K then it will work as T flip-flop.Ĥ. In J-K flip-flop, the function K=J is used to realize _Ĭlarification: T flip-flop allows the same inputs. In a J-K flip-flop, if J=K the resulting flip-flop is referred to as _Ĭlarification: In J-K flip-flop, if both the inputs are same then it behaves like T flip-flop.ģ. The characteristic equation of J-K flip-flop is given by: Q(n+1)=JQ'(n)+K’Q(n).Ģ. The characteristic equation of J-K flip-flop is _Ĭlarification: A characteristic equation is needed when a specific gate requires a specific output in order to satisfy the truth table. Digital Electronics/Circuits Multiple Choice Questions on “Triggering of Flip Flops”.ġ.