Q1:

The total number of memory accesses involved (inclusive of the OP code fetch), when an 8085 processor executes the instruction OUT 80H is

Q2:

A 4-bit ripple counter and a 4-bit synchronous counter are made using flip-flops having a propagation delay of 10ns each. If the worst case delay in the ripple counter and the synchronous counter be R and S respectively then.

Q3:

A 1ms pulse can be converted into a 10ms pulse by using which  one of the following?

Q4:

The number of unused states in a 4-bit Johnson Counter is

Q5:

The highest speed counter is

Q6:

Consider the following statements regarding registers and latches.

1.Registers are temporary storage devices, whereas latches are not 

2.A latch employs cross-coupled feedback connections.

3.A register stores a binary word, where as a latch does not.

The correct statement is/are.

Q7:

 A Ring oscillator consisting of 5 inverters is running at a frequency of 10 MHz. The propagation delay per gate is :

Q8:

A 5 bit module-32 ripple counter uses JK flip-flop if the propagation delay of each FF is 50ns, maximum clock frequency is (in mH_z)

Q9:

Match List-I (circuit) List-II (application) and select the correct answer using the code given below.

List-I	List-II
A. Ripple up counter	1. Division.
B. Synchronous down counter.	2. Multiplication
C. Shift left register	3. To create delay.
D. Shift right register.	4. Transient states

 

Q10:

The counter which requires maximum number of flip-flops for a given MOD number is

Q11:

A circuit consists of two synchronous clocked J-K flip-flop connected as follows: $J_0=K_0={\overline{Q}}_1,J_1=Q_0,K_1={\overline{Q}}_0,$the circuit acts as a.

Q12:

The initial state of MOD-16 down counter is 0110. After 37 clock pulses, the state of the counter will be.

Q13:

If the memory chip size is 1024 × 4, the number of memory chips required to design 8 K memory is

Q14:

If (11X1Y)₈ = (12C9)₁₆ then the value of X and Y are:-

Q15:

In the circuit shown Q, has negligible collection–to-emitter saturation voltage and the diode drops negligible voltage across it, under forward bias negligible voltage across it. If Vcc is 5v, X and Y are digital signals with 0v as logic 0 and V_cc as logic 1. The Boolean expression for Z is

Q16:

When the Boolean function

$F(x_1,x_2,x_3)={{\displaystyle \sum (0,1,2,3)+{\displaystyle \sum }}}_d(4,5,6,7$)

is minimized what does one get?

Q17:

The minimum number of comparators required to build an 8-bit flash ADc is.

Q18:

Assertion (A): the switching speed of ECL gate is very high.

Reason (R) : the devices in ECL gate operate in active region .

Q19:

Which of the following circuits come under the class of combinational logic circuits?

1. Full adder 2.Full subtractor 3.Half adder 4.JK flip-flop 5.Counter

Select the correct answer from the codes given below.

Q20:

Find ‘Y’ from the given MUX when

$\begin{array}{l}{I}_0=\pi M\left(3\right)forf\left(A,B\right)\\ I_1=\pi M\left(6,7\right)forf\left(A,B,C\right)\\ I_2=\overline{A}+\overline{B}\\ I_3=\pi M(12,13,14,15)forf(A,B,C,D)\end{array}$

& selection lines S₀,S₁ can be the choice of user to use only binary singles.