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Multiple Choice Quiz
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1
A(n) ___ is the electronic circuit used to convert the decimal input of a calculator to the BCD code used by the internal circuits or central processing unit.
A)Flip-flop
B)Multiplexer
C)Assembler
D)Encoder
2
Portable digital devices, such as watches or solar-powered calculators, use ___ displays because of their extremely low power consumption.
A)Incandescent
B)LCD (liquid-crystal display)
C)LED (light-emitting diode)
D)Vacuum fluorescent
3
The BCD input into the 7447 decoder IC is ___ causing the 7-segment LED display to read decimal ___ (the number 8 on the display is not the correct output and only shows that this is a 7-segment display).
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A)1001, 9
B)0011, 3
C)0001, 1
D)0111, 7
E)All of the above are correct.
4
A segment of a LCD display is said to be driven or activated by a(n) ___ square-wave signal.
A)DC
B)In-phase
C)Out-of-phase
D)PCMCIA
5
In reference to an operational 74147 TTL encoder IC, if only input 7 is activated with a LOW, active LOW output(s) ___ will be activated.
A)D
B)C and E
C)A, D and E
D)A, B and C
6
The ___ type display uses older vacuum tube technology.
A)LCD
B)LED
C)VF
D)All of the above
7
The seven-segment display (without the use of colored filters) that emits a reddish glow is the ___ type.
A)LED (light-emitting diode)
B)LCD (liquid-crystal display)
C)Vacuum fluorescent
D)All of the above
8
The decimal number 931 equals ___ in 8421 BCD code.
A)1000 0011 1001
B)1001 1100 1000
C)1001 0011 0001
D)0001 0011 1000
9
A widely used 7-bit code is the American Code for Information Interchange or ___ code.
A)ASCII
B)Gray
C)Hollerith
D)BCD
10
The 7447 IC is a BCD-to-7-segment decoder which can drive LED displays and has active ___ (HIGH, LOW) input with active ___ (HIGH, LOW) outputs.
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A)HIGH, HIGH
B)HIGH, LOW
C)LOW, HIGH
D)LOW, LOW





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