1. : Why do we use a demultiplexer?
(A) Route the data from a single input to one of many outputs
(B) Select data from several inputs and route it to a single output
(C) Perform serial to parallel conversion
(D) Both A and B
2. : Which is an example of synchronous inputs?
(A) Preset input (PRE)
(B) EN input
(C) J-K input
(D) Clear Input (CLR)
3. : Which one is the second step of making a transition table?
(A) Determining feedback loop
(B) Designating output of loops
(C) Deriving functions of Y
(D) Plotting
4. : An OR gate can be imagined to look like ____________
(A) Switches connected in parallel
(B) Switches connected in series
(C) MOS transistors connected in series
(D) None of these
5. : The change from a current state to the next state is determined by
(A) Previous state and outputs
(B) Current state and outputs
(C) Current state and the inputs
(D) Previous state and inputs
6. : Each gate takes time for delay of
(A) 2 to 10 ns
(B) 3 to 10 ns
(C) 1 to 5 ns
(D) 3 to 5 ns
7. : In which combination of gates is an arbitrary Boolean function not possible?
(A) OR gates and exclusive OR gate only
(B) NAND gates only
(C) OR gates and NOT gates only
(D) OR gates and AND gates only
8. : Which one of the following is used to simplify the circuit that determines the next state?
(A) State diagram
(B) State assignment
(C) State reduction
(D) Next state table
9. : When both inputs are ____________, the NAND latch works.
(A) Inverted
(B) 0
(C) 1
(D) Don’t cares
10. : ____________ adders are needed to construct an m-bit parallel adder.
(A) m+1
(B) m-1
(C) m
(D) m/2
11. : ________________ is converted by a multiplexer with a register circuit.
(A) Serial data to serial
(B) Serial data to parallel
(C) Parallel data to serial
(D) Parallel data to parallel
12. : Changing input in more than one state is called _______________
(A) Undefined condition
(B) Ideal condition
(C) Reset condition
(D) Race condition
13. : Select the function of a multiplexer.
(A) To perform serial to parallel conversion
(B) To decode information
(C) To transmit data on N lines
(D) To select 1 out of N input data sources and transmit it to a single channel
14. : Select the combinational logic circuit which produces a specific binary word or number.
(A) Encoder
(B) Multiplexer
(C) Decoder
(D) Demultiplexer
15. : Which circuit can be used as a parallel to serial converter?
(A) Decoder
(B) Demultiplexer
(C) Multiplexer
(D) Digital counter
16. : What is the function of shift registers?
(A) Shifting
(B) Rotating
(C) Both A and B
(D) Adding
17. : The 7-segment display produces output
(A) a to g
(B) a to f
(C) a to b
(D) a to z
18. : What is used for BCD to 7-segment conversion?
(A) Multiplexer
(B) Encoder
(C) Decoder
(D) Demultiplexer
19. : Select the universal gate.
(A) NAND
(B) AND
(C) OR
(D) NOT
20. : Which one is NOT an operation provided by a magnitude comparator?
(A) Equal
(B) Addition
(C) Greater
(D) Less
21. : The enable input of the shift register is commonly called?
(A) Load
(B) Strobe
(C) Reset
(D) Store
