## MCQs of DLD

**1. Which of the following gates give output 1, if and only if at least one input is 1?**

A.OR

B.AND

C.NOR

D.NAND

**2. For performing the function of two-input OR gate, What is the minimum number of two-input NAND gates used?**

A.2

B.3

C.4

D.5

**3. In an application where input signals may ________________,Asynchronous circuits are useful.**

A. never change

B. change at any time

C. both a and b

D. None

**4. The time required by a gate or inverter to change their state is called _______________.**

A.Rise time

B.Decay time

C.Charging time

D.Propagation time

**5. The next state is determined in a sequential circuit is determined by ________ and _______**

A. Current state and external input

B. Current state, flip-flop output

C. State variable, current state

D. Input and clock signal applied

**6. SR latch contain ______________**

A. 4 input

B. 3 inputs

C. 2 inputs

D. 1 inputs

**7. If a pulse change from 10% to 90% of its maximum value, the time required is known as _____________.**

A.Rise time

B.Operating speed

C.Propagation time

D.Decay time

**8. By using two cascading counters _____________, ____________ the divide-by-60 counter in digital clock is implemented.**

A. Mod-10, Mod-50.

B. Mod-50, Mod-10

C. Mod-6, Mod-10

D. Mod-50, Mod-6

**9. Which table is not a part of the asynchronous analysis procedure?**

A. transition table

B. excitation table

C. flow table

D. state table

**10. Digital data can be applied to gate by maximum frequency which is called _________________.**

A. Charging time

B. Propagation speed

C. Binary level transaction period

D. Operating speed

**11. Minimum time for which input signal maintained at the input of flip-flop is called _____________ ofÂ the flip-flop.**

A. Set-up time

B. Hold time

C. Pulse Stability time (PST)

D. Pulse Interval time

**12. For making a transition table we use _____________.**

A. 3 steps

B. 5 steps

C. 6 steps

D. 8 steps