BASIC ELECTRONICS
Basic Digital Electronics Quiz
1. The number of flip-flops required to build a mod-19 counter is
A. 4
B. 5
C. 6
D. 7
Click for answer
B. 5
2. In boolean algebra
A(A+B)= ?
A. 1
B. 0
C. A
D. B
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C. A
3. The binary addition of 1+1+1 gives
A. 111
B. 110
C. 11
D. 10
Click for answer
C. 11
4. A De-multiplexer is used to route data from ________ input/s to ________ output/s.
A. one , many
B. many, many
C. one, one
D. many, one
Click for answer
A. one , many
5. What is the decimal equivalent of octal 0.24 ?
A. 0.42
B. 0.24
C. 0.3125
D. 0.12
Click for answer
C. 0.3125
Explanation:
(0.24)
8
= 2/8 + 4/ 8
2
= 0.25 + 4/64 = (0.3125)
10
6. How many 1's are present in the binary representation of
(4x4096)+(9x256)+(7x16)+5 ?
A. 8
B. 9
C. 10
D. 11
Click for answer
A. 8
Explanation:
=(4x4096)+(9x256)+(7x16)+5
=(2
2
x2
12
)+{(8x256)+(1x256)}+{(4x16)+(2x16)+(1x16)}+(4+1)
=(2
2
x2
12
)+{(2
3
x2
8
)+(2
0
x2
8
)}+{(2
2
x2
4
)+(2
1
x2
4
)+(2
0
x2
4
)}+(2
2
+2
0
)
=2
14
+2
11
+2
8
+2
6
+2
5
+2
4
+2
2
+2
0
Hence No. of 1's =8
7. The digital circuit used for counting pulses is called as
A. analog counter
B. shift register
C. counter
D. D flip-flop
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C. counter
8. A toggle operation is used
A. with a gate circuit
B. with a flip-flop
C. without a flip-flop
D. with a flip-flop and a gate circuit
Click for answer
B. with a flip-flop
9. The parity bit is added for _________ purposes.
A. coding
B. indexing
C. error-detection
D. controlling
Click for answer
C. error-detection
10. ROM is composed of
A. magnetic cores
B. microprocessors
C. photoelectric cells
D. floppy disks
Click for answer
A. magnetic cores
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