Exercise: Digital Electronics

Questions for: Digital Electronics

A Karnaugh map with 4 variables has
A:
2 cells
B:
4 cells
C:
8 cells
D:
16 cells
Answer: D

24= 16.

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1001012 is equal to decimal number
A:
47
B:
37
C:
21
D:
17
Answer: B

32 + 4 + 1 = 37 in decimal.

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For a MOD-12 counter, the FF has a tpd = 60 ns The NAND gate has a tpd of 25 n sec. The clock frequency is
A:
3.774 MHz
B:
> 3.774 MHz
C:
< 3.774 MHz
D:
4.167 MHz
Answer: A

For a proper working, the clock period should be equal to or greater than

tpd = Mod 12 - 4FFs = 4 x 60 = 240 nsec.

Total tpd = 240 + 25 = 265 nsec.

= fc and fc = 3.774 MHz.

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It is desired to display the digit 7 using a seven segment display. The LEDs to be turned on are
A:
a, b, c
B:
b, c, d
C:
c, d, e
D:
a, b, d
Answer: A

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The number of unused states in a 4 bit Johnson counter is
A:
2
B:
4
C:
8
D:
12
Answer: C

Total state = 2n = 24 = 16

Used state = 2n = 2 x 4 = 8

Unused state = 16 - 8 = 8.

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