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Digital Electronics
January 25, 2023
Welcome to your Digital Electronics
The given hexadecimal number (1E.53)16 is equivalent to ____________
(35.684)8
(36.246)8
(34.340)8
(35.599)8
Table which can perform the same functions as machines based on logic gates and can be easily reprogrammed without changing the wiring is called
lookup table
logic table
Boolean table
lookdown table
What is the group of 1s in 4 cells of a K – map called?
Quad
Octet
Octave
Pair
What will be the output from a D flip-flop if D = 1 and the clock is low?
2
No change b)
0
Toggle between 0 and 1
An idealized or physical device implementing a Boolean function, it performs a logical operation on one or more binary inputs and produces a single binary output is termed as
Power transistor
NOT gate
Antenna
Logic gate
Which characteristic of IC in Digital Circuits represents a function of the switching time of a particular transistor?
Propagation delay
Fan – out
Power dissipation
Fan – in
In which of the following base systems is 123 not a valid number?
Base 3
Base 16
Base 10
Base 8
A designer can often repair design errors without changing the arrange- ment of wires with the help of
logic table
lookdown table
lookup table
Boolean table
Logic performed by semiconductor diodes and small ferrite toroidal cores for moderate speed and moderate power level is
Core diode logic
Neon logic
Tunnel Diode Logic
4Layer Device Logic
What value is to be considered for a “don’t care condition”?
1
0
Neither 0 or 1
either 0 or 1
Which of the following options comes under the non – saturated logic family in Digital Electronics?
High-Threshold Logic
Diode – Transistor Logic
Emitter – coupled Logic
Integrated – injection Logic
Storage of 1 KB means the following number of bytes
964
1000
1024
1064
A NAND gate is called a universal logic element because
it is used by everybody
all the minization techniques are applicable for optimum NAND gate realization
many digital computers use NAND gates
any logic function can be realized by NAND gates alone
Positive logic in a logic circuit is one in which
logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 voltage level is higher than logic 1 voltage level
logic 0 and, -1 are represented by negative and positive voltages respectively
logic 0 voltage level is lower than logic 1 voltage level.
Which of the following codes is a sequential code?
2421 code
8421 code
2441 code
5421 code
Which of the following gives the correct number of multiplexers required to build a 32 x 1 multiplexer?
Two 8 x 1 mux
Three 8 x 1 mux
Two 16 x 1 mux
Three 16 x 1 mux
An electronic multiplexer can be considered as a multiple-input,
single-output switch
multiple-output switch
no output switch
How must the output of a gate in a TTL digital circuit act when it is HIGH?
Acts as a voltage sink
Acts as a current source
Acts as a voltage source
Acts as a current sink
How many errors can the Digital Electronics parity method can find in a single word?
Triple error
Double error
Single error
Multiple errors
Representation of hexadecimal number (6DE)H in decimal:
6 * 16^2 + 13 * 16^1 + 14 * 16^0
6 * 16^2 + 11 * 16^1 + 14 * 16^0
6 * 16^2 + 14 * 16^1 + 15 * 16^0
6 * 16^2 + 12 * 16^1 + 13 * 16^0
Time is Up!
Time’s up
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