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4th Year Electrical > Electronics > Flashcards

Electronics Flashcards

1
Q

AND gate truth statement

A

Any low gives a low
A•B=Y

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2
Q

OR gate truth statement

A

Any high gives a high
A+B=Y

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3
Q

NAND gate truth statement

A

Any low gives a high
—-
A•B=Y

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4
Q

NOR gate truth statement

A

Any high gives a low
——
A+B=Y

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5
Q

NOT (inverter) gate truth statement

A

Output is opposite input
-
A=A

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6
Q

XOR gate truth statement

A

A or B, not both
- -
A•B + A•B=Y

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7
Q

The largest digit (figure) in a number system is always one (more/less) ________ than the base of that number system

A

Less

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8
Q

A straight binary number is always the same as a BCD number. (True/false)

A

False

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9
Q

What is the main outstanding feature of using ‘gray code’ for use with transducers?

A

Changes by one bit per position

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10
Q

What is ASCII used for?

A

Coding computer inputs into binary
De-coding it back so we can understand

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11
Q

When a flip-flop is preset it stores a binary __ (1 or 0)

A

1

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12
Q

To set or clear a flip-flop, must the signlas applied to the PR and CLR inputs be permanent?

A

No

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13
Q

Can a single flip-flop store more than one binary bit of data to Q?

A

No

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14
Q

Which is considered the primary output of a flip-flop;
-
Q or Q?

A

Q

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15
Q

When 1 is present at the Q output of a flip-flop, it is said to be in the _____ (set/reset) condition.

A

Set

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16
Q

Another term used for a flip-flop being in the clear condition is that it is ______ (set/reset).

A

Reset

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17
Q

By applying a low to the PR input the J-K flip-flop will be _____ (set/reset).

A

Set

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18
Q

By applying a low to the CLR input the J-K flip flop will be _____ (set/reset)

A

Reset

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19
Q

When J and K inputs are both 1, and an appropriate clock pulse occurs, what happens to the flip-flop’s Q input?

A

It changes

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20
Q

What gate is this?

A

AND gate

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21
Q

What gate is this?

A

OR gate

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22
Q

What gate is this?

A

NAND gate

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23
Q

What gate is this?

A

NOR gate

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24
Q

What gate is this?

A

NOR gate

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25
Q

What gate is this?

A

NOT (inverter) gate

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26
Q

What gate is this?

A

XOR gate

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27
Q

What advantage does a DIP encased in ceramic have over one encased in plastic?

A

Heat regulation

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28
Q

Which is known for its faster switching speeds, TTL or CMOS?

A

TTL

29
Q

Which logic family is known to be very sensitive to static electricity, TTL or CMOS?

A

CMOS

30
Q

A floating input on TTL chips will act as if they are tied ________ (high/low)

A

High

31
Q

For an AND gate should a floating (unused) input be tied high or low?

A

High

32
Q

Should a floating (unused) input for an OR gate be tied high or low?

A

Low

33
Q

How will a logic probe indicate the presence of a 1 when being used to troubleshoot digital circuits?

A

Red light (1)
Green light (0)

34
Q

What does IC stand for?

A

Integrated chip

35
Q

What does DIP stand for?

A

Dual Inline Package

36
Q

A logic probe receives its supply from an internal battery. (True/false)

A

False

37
Q

A disadvantage with IC chips compared to discrete components is the large size. (True/false)

A

False

38
Q

An IC is less reliable than a discrete circuit. (True/false)

A

False

39
Q

Discrete circuits are more expensive than IC’s. (true/false)

A

True

40
Q

IC’s can contain over a million transistors in less than one square inch. (True/false)

A

True

41
Q

When comparing an open-loop op-amp to a closed-loop op-amp, which has the higher gain?

A

Open loop

42
Q

How is the gain of an op-amp controlled?

A

Closed loop

43
Q

What is the expected input impedance of the ideal op-amp?

A

High

You want the input voltage to be amplified. If there were a low impedance path through the inputs there would be a volt drop and an incorrect input

44
Q

What is the expected output impedance of the ideal op-amp?

A

Low

Once the voltage has been amplified you want that voltage to be seen across the load

45
Q

List two practical applications where you would find op-amps being used in real world equipment.

A

PLC’s
VFD’s

46
Q

What does OP-AMP stand for?

A

Operational amplifier

47
Q

Is the following op-amp inverted or non inverted?
What would be the equation to find gain?

A

Non inverted
50Kohm/1Kohm +1

48
Q

Is the following op-amp inverted or non inverted?
What would be the equation to find gain?

A

Inverted
27Kohm/3.3Kohm

49
Q

An operational amplifier has two inputs. What are they called?

A

Inverting
Non inverting

50
Q

What is the difference between open-loop and closed-loop operation of an op-amp?

A

Open loop - no feedback, high gain, unstable
Closed loop - feedback, low gain, stable

51
Q

Not a question, just study this bitch

A

Yessir

52
Q

List a reason for using negative feedback when operating an op-amp.

A

Controls the gain without distortion

53
Q

What is the expected input impedance of an ideal op-amp?

A

High

54
Q

What is the expected output impedance of an ideal op-amp?

A

Low

55
Q

What type of power supply is used for an op-amp?

A

DC dual voltage with a center reference

56
Q

What is the purpose of input S if R =0?

A

To set Q

57
Q

What is the purpose of input R if S =0?

A

To reset Q

58
Q

Q and Qnot are said to be ______.

A

Complimentary

59
Q

Identify the clock signal that will trigger the F.F. (Leading or trailing edge)

A

Trailing edge

60
Q

Identify the clock signal that will trigger the F.F. (Leading or trailing edge)

A

Leading edge

61
Q

In order to set a JK F.F. to toggle mode:
J=
K=

A

J=1
K=1

62
Q

What is the purpose of the inputs PR and CLR on a JK F.F.?

A

PR - To preset Q (Q=1)
CLR - To clear Q (Q=0)

63
Q

IC’s made of bipolar transistors are referred to as _____.

A

TTL

64
Q

IC’s made of field effect transistors are referred to as ________.

A

CMOS

65
Q

Which standard IC technology consumes more power but is faster? (TTL/CMOS)

A

TTL

66
Q

Which IC (TTL/CMOS) could be damaged by a floating input?

A

CMOS

67
Q

Should a logic probe be on pulse or memory when troubleshooting a circuit for high/low operation?

A

Pulse

68
Q

Describe the propagation delay

A

The time it takes for an output to change in response to an input

4th Year Electrical (7 decks)

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