Question 1 |
The Boolean expression A \oplus B \oplus A is equivalent to
AB + \bar {A}\bar B | |
\bar{A}B+A\bar{B} | |
B | |
\bar{A} |
Question 1 Explanation:
Question 2 |
The below figure shows four D-type flip-flops connected as a shift register using a XOR gate. The initial state and three subsequent states for three clock pulses are also given.

\begin{array}{|c|c|c|c|c|} \hline \text{State} & Q_{A} & Q_{B} & Q_{C} & Q_{D} \\\hline \text{Initial} & 1 & 1 & 1 & 1 \\\hline \text{After the first clock} & 0 & 1 & 1 & 1 \\\hline \text{After the second clock} & 0 & 0 & 1 & 1 \\\hline \text{After the third clock} & 0 & 0 & 0 & 1 \\\hline \end{array}
The state Q_{A} Q_{B} Q_{C} Q_{D} after the fourth clock pulse is

\begin{array}{|c|c|c|c|c|} \hline \text{State} & Q_{A} & Q_{B} & Q_{C} & Q_{D} \\\hline \text{Initial} & 1 & 1 & 1 & 1 \\\hline \text{After the first clock} & 0 & 1 & 1 & 1 \\\hline \text{After the second clock} & 0 & 0 & 1 & 1 \\\hline \text{After the third clock} & 0 & 0 & 0 & 1 \\\hline \end{array}
The state Q_{A} Q_{B} Q_{C} Q_{D} after the fourth clock pulse is
0000 | |
1111 | |
1001 | |
1000 |
Question 2 Explanation:
Question 3 |
Fig. below shows the circuit diagram of a wien bridge oscillator using an op-amp.

The frequency of oscillation is given by f= 1/2 \pi CR. To have the system oscillate the ratio R_{2}/R_{1} should be

The frequency of oscillation is given by f= 1/2 \pi CR. To have the system oscillate the ratio R_{2}/R_{1} should be
0.5 | |
29 | |
2 | |
Any value |
Question 3 Explanation:
Question 4 |
A Boolean function f is to be realized only by NOR gates. Its K-map is given below:

The realization is


The realization is

A | |
B | |
C | |
D |
Question 4 Explanation:
Question 5 |
The refreshing rate of dynamic RAMs is in the range of
2 microseconds | |
2 milliseconds. | |
50 milli seconds | |
500 milliseconds |
Question 5 Explanation:
There are 5 questions to complete.