Digital Electronics

21. The fan put of a 7400 NAND gate is

1. 2TTL
2. 5TTL
3. 8TTL
4. 10TTL

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22. The number 1000 would appear just immediately after

1. FFFF (hex)
2. 1111 (binary)
3. 7777 (octal)
4. All of the above.

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23. The number of Boolean functions that can be generated by n variables is equal to

1. 2n
2. 22 n
3. 2n-1
4. — 2n

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24. What is the octal equivalent of the binary number:10111101

1. 675
2. 275
3. 572
4. 573

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25. Which of the following gate is a two-level logic gate

1. OR gate
2. NAND gate
3. EXCLUSIVE OR gate
4. NOT gate.

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