Exercise: Digital Electronics

Questions for: Digital Electronics

The number FF in hexadecimal system is equivalent to number __________ in decimal system.
A:
256
B:
255
C:
240
D:
239
Answer: B

FF = 15 x 16 + 15 = 255.

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A 4 bit ripple counter starts in 0000 state. When the counter reads 0010 the number of clock pulses which have occurred is
A:
2
B:
18
C:
2 or 18
D:
2 or 18 or 34
Answer: D

At pulse 1 the state changes to 0001 and at pulse 2 it changes to 0010 Since it has a total of 16 states, the counter returns to 0000 after 16 and 32 pulses.

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Inverter 74 LS04 has following specifications I0H max = - 0.4 mA, I0L max = 8 mA, IIH max = 20 ΞA, IIL max = 0.1 mA
The fan out of this inverter is
A:
10
B:
20
C:
60
D:
100
Answer: B

Fan out in low state = = 80 Fan out in high state = Hence fan out is smaller of two values ie., 20.

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TTL is used in electronic calculators.
A:
True
B:
False
C:
D:
Answer: B

Calculators use CMOS.

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Three Mod-16 counters are connected in cascade. The maximum counting range is
A:
16
B:
256
C:
4096
D:
none of the above
Answer: C

16 x 16 x 16 = 4096.

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