Electronics and Communication Engineering - Digital Electronics

1. 

The number of memory locations in which 14 address bits can access is

A. 1024
B. 2048
C. 4096
D. 16384

Answer: Option D

Explanation:

214 = 16384.


2. 

What will be conversion rate for a counter type A/D converter contains a 4 bit binary ladder and a counter driven by a 2 MHz clock. Then conversion time

A. 125
B. 125 x 103
C. 125 x 106
D. None

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

3. 

A 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V. It meets standard linearity then resolution in percent and volts.

A. 3% 7 V
B. 6.4 V, 2%
C. 0.1%, 1.57 V
D. 1.57%, 0.1 V

Answer: Option D

Explanation:

R-2R ladder, resolution =

Resolution in volts = .


4. 

What will be output for decimal input 82?

A. 0.82 V
B. 8 V
C. 0.1 V
D. 10 mV

Answer: Option A

Explanation:

Output for decimal input 82/(10000010) = 0.01 x 82 = 0.82 V.


5. 

The circuit of the given figure gives the output Y =

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

Answer: Option D

Explanation:

When any input is High, the corresponding transistor conducts and output is Low. Hence it is a NOR gate.


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