# Electronics and Communication Engineering - Digital Electronics

16.

In figure, R = 20KΩ and C = 75 pF. The converter clock frequency will be

 A. 606 Hz B. 1212 Hz C. 555 KHz D. 606 KHz

Explanation:

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17.

If a microcomputer has a 64 K memory; what is the hexadecimal notations for the first memory location?

 A. AAAA B. FFFF C. AAA0 D. 0000

Explanation:

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18.

In the switching circuit, switches A, B have value 0 for OFF, 1 for ON and the output Y has 0 volts for 1 volts, then the expression for Y is

 A. AB B. A + B C. A + B D. AB

Explanation:

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19.

2's complement number 00011111 = __________ 10

 A. +31 B. -31 C. +11 D. -11

Explanation:

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20.

In 8085 microprocessor, what is the length of temporary register?

 A. 6 bits B. 8 bits C. 12 bits D. 16 bits