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1st sem (2nd YR) > DIGELEC1 (Finals) > Flashcards

DIGELEC1 (Finals) Flashcards

1
Q

An example of a basic flip-flop is the

A

RS flip flop

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2
Q

RS flip flop is formed by

A

two cross-coupled NOR and NAND gate

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3
Q

How many outputs and inputs does an RS flip flop have

A

INPUT
- Reset
- Set

OUTPUT
- Q
- Not Q

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4
Q

In RS flip flop the outputs are always

A

opposite

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5
Q

In RS flip flop what input is described as “illegal” or “unallowed”

A

R = 1
S = 1

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6
Q

a device that serves as a temporary buffer memory. It is used to hold data after the input signal is removed.

A

Latch

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7
Q

Example of a latch device

A

D flip flop

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8
Q

The data are latched when the enable line is

A

Low

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9
Q

the output follows the input when the enable line is

A

High

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10
Q

It occurs when the output follows/is the same as the input only when the enable is active

A

Transparent latch

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11
Q

2 categories of binary counters

A
  • Synchronous
  • Asynchronous
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12
Q

The input clock pulse is first felt by the first flip-flop. The effect is not felt by the second flip-flop immediately because of the delay through the first flip-flop.

A

Asynchronous

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13
Q

Asynchronous counters are commonly referred to as

A

Ripple counter

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14
Q

a counter in which each stage is
clocked at the same time

A

Synchronous

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15
Q

Synchronous counter is also called

A

Parallel counter

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16
Q

have a modulus of ten, or ten states in their counting sequence. A common type of this counter is the BCD (8421) counter, which produces a binary-coded-decimal sequence

A

Decade counter

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17
Q

A counter than can
count in either direction through
a certain sequence.

A

up-down counter

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18
Q

up-down counter is also called

A

bidirectional counter

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19
Q

are constructed of flip-flops wired together.

A

shift register

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20
Q

The circuit whose output at any instant depends only on the input present at that instant only

A

Combinational circuit

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21
Q

The circuit whose output at any instant depends not only on the input present but also on the past output

A

sequential circuit

22
Q

This type of circuit has no memory unit

A

Combinational circuit

23
Q

This type of circuit has memory unit for stored past output

A

sequential circuit

24
Q

An example of this circuit are half adder, full adder, magnitude comparator, multiplexer, demultiplixer

A

Combinational circuit

25
Q

Example of this circuit are flip flops, register, counter

A

sequential circuit

26
Q

This type of circuit is faster in speed

A

Combinational circuit

27
Q

This type of circuit is slower in speed

A

Sequential circuit

28
Q

2 categories of sequential circuits

A
  • Asynchronous
  • Synchronous
29
Q

Output changes at discrete interval of time. It is a circuit based on an equal state time or a state time defined by external means such as clock.

A

Synchronous sequential circuit

30
Q

Output can be changed at any instant of time by changing the input. It is a circuit whose state time depends solely upon the internal logic circuit delays.

A

Asynchronous sequential circuit

31
Q

A circuit that changes from 1 to 0 or from 0 to 1 when current is applied. It is one bit storage location

A

basic flip flop

32
Q

SR flip flop is also called

A

SR latch

33
Q

this circuit is used to overcome invalid state of the SR flip flop

A

clocked SR flip flop

34
Q

Modification of the clocked SR flip flop

A

D flip flop

35
Q

refers to a periodic signal where the ON and OFF times do not need to be the same

A

Clock signal

36
Q

Types of triggering

A
  • Level triggering
  • Edge triggering
37
Q

The circuit is only activated in whenever the clock pulse happens to be at any particular level

A

Level triggering

38
Q

Types of level triggering

A
  • Positive
  • Negative
39
Q

This transition or triggering either occurs from Logic High
to Logic Low or from Logic Low to Logic High

A

Edge triggering

40
Q

Types of edge triggering

A
  • Positive
  • Negative
41
Q

a device that selects between several analog ordigital input signals and forwards the selected input to a single output line.

A

multiplexer

42
Q

Multiplexer is also known as

A

data selector

43
Q

In multiplexer the selection is directed by a separate set of digital inputs known as

A

select lines

44
Q

It takes a single input signal and routes it to one of many output lines

A

demultiplexer

45
Q

Demultiplexer is also called as

A

data distributor

46
Q

is a multiple-input, multiple-output logic circuit that converts coded inputs into coded outputs, where the input and output codes are different.

A

decoders

47
Q

Types of decoders

A
  • Binary decoders
  • BCD to 7 segment decoders
  • Demultiplexers as decoders
48
Q

are devices that convert information from one format or code to another, typically for standardization, speed, secrecy, or compression.

A

encoder

49
Q

are sensors that detect position and speed by converting rotational mechanical displacements into electrical signals and processing those signals

A

rotary encoders

50
Q

Types of encoders

A
  • Rotary encoders
  • Absolute encoders
  • incremental encoder

1st sem (2nd YR) (24 decks)

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