1. . A combinational logic circuit consists of:
(A) Input variables
(B) Output variables
(C) Logic gates
(D) All of these
2. . A combinational circuit which accepts the binary information from several input lines or sources and sends the data on a single output line:
(A) Decoder
(B) Multiplexer
(C) Encoder
(D) Demultiplexer
3. . Multiplexer is also called:
(A) Data Distributer
(B) Data Selector
(C) Decoder
(D) Encoder
4. . Multiplexer has:
(A) Many inputs & Many Outputs
(B) One input & Many outputs
(C) Many inputs & one outputs
(D) One input & one output
5. . The number of select lines in 8 to 1 line multiplexer are:
(A) Two
(B) Three
(C) Four
(D) Five
6. . De-Mux means:
(A) One into one
(B) One into many
(C) Many into one
(D) Many into many
7. . De-Mux is also called:
(A) Data Distributer
(B) Data Selector
(C) Decoder
(D) Encoder
8. . Which IC is used for 1-to-16-line De-Mux?
(A) 74137
(B) 74138
(C) 74154
(D) All of these
9. . This logic gate is used while making decoder circuit:
(A) AND Gate
(B) OR Gate
(C) NAND Gate
(D) NOR Gate
10. . BCD decoder is also called:
(A) 2-to-4-line decoder
(B) 3-to-8-line decoder
(C) 4-to-16-line decoder
(D) 4-to-10-line decoder
11. . 7445 IC is a:
(A) Encoder
(B) Decoder
(C) Multiplexer
(D) Demultiplexer
12. . 7-Segment display consists of:
(A) 6 LEDs
(B) 7 LEDs
(C) 8 LEDs
(D) 9 LEDs
13. . A single 7-Segment display displays the decimal digits from:
(A) 0 to 7
(B) 0 to 9
(C) 0 to 10
(D) 0 to 15
14. . Which IC is used to drive the 7-Segment display?
(A) 7446
(B) 7447
(C) Both a & b
(D) None of these
15. . A logic circuit which converts decimal into binary:
(A) Encoder
(B) Decoder
(C) Multiplexer
(D) Demultiplexer
16. . 74LS147 is an encoder:
(A) Octal to Binary
(B) Binary to decimal
(C) Decimal to BCD
(D) BCD to decimal
17. . Output of encoder is:
(A) Decimal
(B) Binary
(C) Octal
(D) All of these
18. . Input of decoder is:
(A) Decimal
(B) Binary
(C) Octal
(D) All of these
19. . When all seven segments of a display are energized, the number shown will be:
(A) 8
(B) 6
(C) 9
(D) 10
20. . 74LS154 Demultiplexer has data outputs:
(A) 4
(B) 8
(C) 16
(D) 10
21. . 7-segment display are used in:
(A) Instruments
(B) Digital Clocks
(C) Calculators
(D) All of these
22. . If active low output is required in BCD to decimal decoder, which gates are used for decoding purpose?
(A) AND Gate
(B) NAND Gate
(C) OR Gate
(D) NOR Gate
23. . Seven segment displays in which all the anodes of LEDs are common is called:
(A) Common Anode
(B) Common Cathode
(C) Both a & b
(D) None of these
24. . IC 74LS46 drives the 7-segment display:
(A) Common Anode
(B) Common Cathode
(C) Both a & b
(D) None of these