Electronics and Communication Engineering - Digital Electronics

6. 

An 8085 microprocessor based system uses a 4 k x 8 bit RAM whose address in AAOOH. The address of the last byte in this RAM is

A. OFFFH
B. 1000H
C. B9FFH
D. BA00H

Answer: Option D

Explanation:

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7. 

Read the following statements: Dual slope ADC provides

  1. higher speed as compared to other ADC
  2. very good accuracy
  3. good rejection of power supply
  4. better resolutions compared to other ADC for the same number of bits
Which of the above are correct?

A. 1 and 2
B. 2 and 3
C. 1, 2, 3
D. 1, 2, 3, 4

Answer: Option B

Explanation:

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8. 

In 8085 microprocessor, how many I/O ports can be accessed by memory mapped method?

A. 8
B. 256
C. 32 K
D. 64 K

Answer: Option C

Explanation:

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9. 

The open wired circuit in the given figure works as a

A. EX - NOR gate
B. AND gate
C. XOR gate
D. NOR gate

Answer: Option C

Explanation:

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10. 

The circuit shown below is functionally equivalent to

A. NOR gate
B. OR gate
C. EX-OR gate
D. NAND gate

Answer: Option C

Explanation:

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