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

Answer: Option A

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

Answer: Option D

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

Answer: Option C

Explanation:

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19. 

2's complement number 00011111 = __________ 10

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

Answer: Option A

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

Answer: Option B

Explanation:

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