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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 4
36.
A 4 bit down counter can count from
0000 to 1111
1111 to 0000
000 to 111
111 to 000
Answer: Option
Explanation:

It can count from 15 to 0 or 1111 to 0000.

37.

Assertion (A): In computers the data is stored in hexadecimal form

Reason (R): Hexadecimal representation is short as compared to binary representation.

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:

Data is stored in binary form only.

38.
For the circuit of the given figure, the output equation is
Y = ABCD
Y = AB + CD
Y = A + BCD
Y = ABC + D
Answer: Option
Explanation:

The inputs A and B are ANDed. Inputs B and C' so ANDed. The outputs of two AND gates are ORed.

39.
Using 2's complement, the largest positive and negative number which can be stored with 8 bits are
+128 and -127
+128 and -128
+127 and -128
+127 and -127
Answer: Option
Explanation:

Largest positive number is 0111 111 = + 127 and largest negative number is 1000 0000 = -128.

40.
Three Mod-16 counters are connected in cascade. The maximum counting range is
16
256
4096
none of the above
Answer: Option
Explanation:

16 x 16 x 16 = 4096.

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