21. A 1-bit full adder takes 20 ns to generate carry-out bit and 40 ns for the sum bit. What is the maximum rate of addition per second when four 1-bit full adders are cascaded?
22. The addition of the two number (1A8)16 + (67B)16 will be:
23. An array multiplier is used to find the product of a 3 bit number with a 4 bit number. How many 4 bits adders are required to perform multiplication?
24. The given circuit operates as a
25. The fan out TTL logic gate is about:
26. In the given figure shows a 4 bit serial in parallel out right shift register. The initial contents as shown are 0110. After 3 clock pulses the contents will be
27. The Boolean expression $$\left( {\overline {\text{A}} + {\text{B}}} \right)\left( {{\text{A}} + \overline {\text{C}} } \right)\left( {\overline {\text{B}} + \overline {\text{C}} } \right)$$ simplifies to
28. Decimal 43 in Hexadecimal and BCD number system is respectively
29. Consider the following statements regarding the Moore and Mealy models:
1. In the Mealy circuit, the final output depends only on the present state of memory elements.
2. In the Moore circuit, output can change in between the clock edges if the external inputs change.
3. The implementation of a logic function in Mealy circuit needs more number of states than Moore circuit.
Which of the above statements are not correct?
1. In the Mealy circuit, the final output depends only on the present state of memory elements.
2. In the Moore circuit, output can change in between the clock edges if the external inputs change.
3. The implementation of a logic function in Mealy circuit needs more number of states than Moore circuit.
Which of the above statements are not correct?
30. Which circuit is having both programmable gates
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