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4th Year Electrical > 4th Year Review > Flashcards

4th Year Review 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

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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8
Q

What is ASCII used for?

A

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

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9
Q

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

A

1

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10
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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11
Q

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

A

No

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12
Q

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

A

Q

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13
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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14
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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15
Q

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

A

Set

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16
Q

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

A

Reset

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17
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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18
Q

What gate is this?

A

AND gate

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19
Q

What gate is this?

A

OR gate

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20
Q

What gate is this?

A

NAND gate

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21
Q

What gate is this?

A

NOR gate

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22
Q

What gate is this?

A

NOT (inverter) gate

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23
Q

What gate is this?

A

XOR gate

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24
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

25
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

26
Q

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

A

PLC’s
VFD’s

27
Q

What does OP-AMP stand for?

A

Operational amplifier

28
Q

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

A

Non inverted
50Kohm/1Kohm +1

29
Q

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

A

Inverted
27Kohm/3.3Kohm

30
Q

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

A

Inverting
Non inverting

31
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

32
Q

Not a question, just study this bitch

A

YAGA

33
Q

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

A

Controls the gain without distortion

34
Q

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

A

DC dual voltage with a center reference

35
Q

Give two examples of process variables

A

Speed
Position
Fluid pressure
Liquid level
Liquid flow
Temperature

36
Q

What is open loop?

A

Not automatic
No feedback
Requires operator

37
Q

What is closed loop?

A

Automatic
Feedback
No operator required

38
Q

What is a transducer?

A

Converts energy from one form to another

39
Q

List four types of linear motion sensors

A

Potentiometer
Variable inductor
Variable capacitor
Variable differential transformer

40
Q

What are three common uses of sensors? (What do they detect?)

A

Motion
Force
Temperature
Light
Position
Fluid pressure/flow

41
Q

What is a bonded wire strain gauge used to sense?

A

Force

42
Q

List three type of fluid pressure sensors

A

Bourdon tube
Bellows
Diaphram

43
Q

Which device consists of two dissimilar metals that when heated produce a small voltage?

A

Thermocouple

44
Q

Which feedback sensor would produce a small voltage when subjected to vibration?

A

Piezo electric crystal

45
Q

Which two signals does a comparator use to determine an error signal?

A

Set point
Feedback

46
Q

What is the function of an actuator?

A

Converts electrical energy to;
Motion
Heat
Light

47
Q

What does a solenoid do?

A

Provides linear motion

48
Q

What is a sensor?

A

Measures and senses the process variable and provides feedback to the controller

49
Q

What type of sensor is this?

A

Linear motion potentiometer. Works with both AC and DC

50
Q

What type of sensor is this?

A

Linear motion variable inductor. Works with AC only

51
Q

What is an actuator?

A

A device that converts an input signal into mechanical motion

52
Q

What is the process variable?

A

A variable that needs to be controlled

53
Q

What is the set point?

A

The desired value of the process variable

54
Q

Who has the authority or jurisdiction of emergency and exit installations?

A

CEC - general wiring of installation
NBC - governs where equipment is required

55
Q

Briefly describe standby power supply

A

A reliable source of power that is available either automatically or manually to maintain current supply to essential loads

56
Q

List four different places that commonly use a standby power supply

A

Hospitals
Schools
Airports
Shopping centers

57
Q

What are UPS systems usually used for?

A

Provide backup power to critical loads
Provides power conditioning to sensitive loads

58
Q

What are the two main classifications of UPS systems?

A

Online and offline

59
Q

What is the difference between the two classifications of UPS systems?

A

Online: zero transfer time as the charger, batteries and inverter are always supplying the load
Offline: short transfer time as the static transfer switch goes from normal power to battery and inverter supplying the load

4th Year Electrical (8 decks)

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