In a 7 segment display, LEDs b and c lit up. The decimal number displayed is 9 7

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Question
In a 7 segment display, LEDs b and c lit up. The decimal number displayed is
Options
A. 9
B. 7
C. 3
D. 1

Correct Answer

1

Explanation

In a 7 segment display, LEDs b and c lit up. The decimal number displayed is 9 7 3 1

Digital Electronics problems

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1. A 12 bit ADC is used to convert analog voltage of 0 to 10 V into digital. The resolution is
Options
A. 2.44 mV
B. 24.4 mV
C. 1.2 V
D. none of the above

2. A device which converts BCD to seven segment is called
Options
A. encoder
B. decoder
C. multiplexer
D. none of these

3. Which of the following is non-saturating?
Options
A. TTL
B. CMOS
C. ECL
D. Both (a) and (b)

4. An OR gate has 4 inputs. One input is high and the other three are low. The output
Options
A. is low
B. is high
C. is alternately high and low
D. may be high or low depending on relative magnitude of inputs

5. The access time of a word in 4 MB main memory is 100 ms. The access time of a word in a 32 kb data cache memory is 10 ns. The average data cache bit ratio is 0.95. The efficiency of memory access time is
Options
A. 9.5 ns
B. 14.5 ns
C. 20 ns
D. 95 ns

6. BCD input 1000 is fed to a 7 segment display through a BCD to 7 segment decoder/driver. The segments which will lit up are
Options
A. a, b, d
B. a, b, c
C. all
D. a, b, g, c, d

9. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is
Options
A. 2 and 7
B. 3 and 7
C. 1 and 6
D. 3 and 6

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