Digital Electronics

1. (1(10101)2 is

1. (37)10
2. ( 69)10
3. (41 )10
4. — (5)10

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2. A debouncing circuit is

1. an astable MV
2. a bistable MV
3. a latch
4. a monostable MV.

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3. A hexadecimal odometer displays F 52 F. The next reading will be

1. F52E
2. G52F
3. F53F
4. F53O.

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4. A NAND gate is called a universal logic element because

1. it is used by everybody
2. any logic function can be realized by NAND gates alone
3. all the minization techniques are applicable for optimum NAND gate realization
4. many digital computers use NAND gates.

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5. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

1. TTLAS
2. CMOS
3. ECL
4. TTLLS

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6. An AND gate will function as OR if

1. all the inputs to the gates are “1”
2. all the inputs are ‘0’
3. either of the inputs is “1”
4. all the inputs and outputs are complemented.

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7. An OR gate has 6 inputs. The number of input words in its truth table are

1. 6
2. 32
3. 64
4. 128

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8. Assuming 8 bits for data, 1 bit for parity, I start bit and 2 stop bits, the number of characters that 1200 BPS communication line can transmit is

1. 10 CPS
2. 120 CPS
3. 12CPS
4. None of the above.

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9. Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000?

1. Two’s complement only
2. Sign and magnitude and one’s complement only
3. Two’s complement and one’s complement only
4. All three representations.

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10. Digital computers are more widely used as compared to analog computers, because they are

1. less expensive
2. always more accurate and faster
3. useful over wider ranges of problem types
4. easier to maintain.

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