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Electronics and Communication Engineering - Digital Electronics

Exercise : Digital Electronics - Section 5
31.
For a 4096 x 8 EPROM, the number of address lines is
14
12
10
8
Answer: Option
Explanation:

4096 = 212 .

32.

Assertion (A): A PROM can be used as a synchronous counter

Reason (R): Each memory location in a PROM can be read synchronously.

Both A and R are correct and R is correct explanation of A
Both A and R are correct but R is not correct explanation of A
A is true, R is false
A is false, R is true
Answer: Option
Explanation:

PROM is a memory. It is not a counter.

33.
A B C D + AB C D =
ABC
ABCD
A B D
ABCD
Answer: Option
Explanation:

A B C D + A B C D = A B D(C + C) = A B D .

34.
Find the output voltage for 011100 in a 6 bit R-2R ladder D/A converter has a reference voltage of 6.5 V.
6.4 V
2.84 V
0.1 V
8 V
Answer: Option
Explanation:

(an-1 2n-1 + an-2 2n-2 + .....a121 + a020)

(24 + 23 + 22) = 6.5 x = 2.84 .

35.
Binary number 1101 is equal to octal number
17
16
15
14
Answer: Option
Explanation:

1101 = 13 in decimal = 15 (i.e., 8 + 5) in octal.

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