# Digital Electronics

• ## The binary number 10101 is equivalent to decimal number_____.

• A. 19
• B. 12
• C. 27
• D. 21
Explanation:

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• ## Pick out the CORRECT statement:

• A. In a positional number system, each symbol represents the same value irrespective of its position
• B. The highest symbol in a position number system as a value equal to the number of symbols in the system
• C. It is not always possible to find the exact binary
• D. Each hexadecimal digit can be represented as a sequence of three binary symbols.
Explanation:

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• ## In case of OR gate, no matter what the number of inputs, a_____.

• A. 1 at any input causes the output to be at logic 1
• B. 1 at any input causes the output to be at logic 0
• C. 0 any input causes the output to be at logic 0
• D. 0 at any input causes the output to be at logic 1.
Explanation:

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• ## The NAND gate is AND gate followed by_____.

• A. NOT gate
• B. OR gate
• C. AND gate
• D. None of the above
Explanation:

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• ## NAND. gates are preferred over others because these_____.

• A. have lower fabrication area
• B. can be used to make any gate
• C. consume least electronic power
• D. provide maximum density in a chip
Explanation:

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• ## The only function of NOT gate is to_____.

• A. Stop signal
• B. Invert input signal
• C. Act as a universal gate
• D. None of the above
Explanation:

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• ## When an input signal 1 is applied to a NOT gate, the output is_____.

• A. 0
• B. 1
• C. Either 0 & 1
• D. None of the above
Explanation:

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• ## Digital circuit can be made by the repeated use of_____.

• A. OR gates
• B. NOT gates
• C. NAND gates
• D. None of the above
Explanation:

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• ## In which of the following base systems is 123 not a valid number?

• A. Base 10
• B. Base 16
• C. Base 8
• D. Base 3
Explanation:

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• ## 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_____.

• A. 10 CPS
• B. 120 CPS
• C. 12 CPS
• D. None of the above