4th Year Final

Question 1

Name two main functions of control devices in electrical sustenance

Answer 1

1. Monitoring and maintain the quality of the power

2. switching electrical loads

Question 2

What three conditions will require shutdown of the supply air fan?

Answer 2

1. Signal from fire alarm control panel to shutdown
2. Close isolation damper
3. Reaching low temperature limit

Question 3

What type of control system uses only one controller to run all system logic?

Answer 3

DDC Control

Question 4

What condition aids in keeping contagion from entering an isolation room?

Answer 4

Positive relative pressure

Question 5

____time is the time it takes a programmable controller to make a sweep of the program.

Answer 5

Scan

Question 6

The output module sends a signal to a control field device, the power needed to energize the field device is provided by____.

Answer 6

Separate power source

Question 7

The current output of a solar cell depends on_____.

Answer 7

Temperature
Irradiance
Operating voltage

Question 8

Which effects size and cost of any standalone photovoltaic system?

Answer 8

Load energy consumption

Question 9

Solar___is the total amount ofsolar energy accumulated on area over time.

Answer 9

Irradiation

Question 10

When reading PLC ladder logic,a good rule to adhere to is “follow the current flow.”

True or False

Answer 10

False

Question 11

PLCs are___designed for use in the control of a wide variety o fmanufacturing machines and systems.

Answer 11

Special purpose industrial computers

Question 12

Actuated by a separate electrical circuit…

Answer 12

Relay

Question 13

In PLC programming, the term “force”refers to….

Answer 13

Overriding a program input value by using the PLCs software

Question 14

A solar irradiance level of 1000W/m2 is commonly associated with____.

Answer 14

Module output ratings

Question 15

Wallwasher luminaries are said to have ____form of light distribution.

Answer 15

Asymmetric

Question 16

A light emitted from a metal object heated to the point of incandescent, best describes____light operation.

Answer 16

Halogen

Question 17

Two major principles to controlling lighting systems. Controlling___and controlling____.

Answer 17

Power, time

Question 18

What are two broad categories that HID and fluorescent ballasts fall into?

Answer 18

Magnetic and electronic

Question 19

3 fluorescent lamp starting techniques?

Answer 19

Rapid start
Instant start
Programmed rapid start

Question 20

Four main considerations or concepts to apply to lighting technology

Answer 20

1. Matching lights to the application or area
2. Color characteristics of the lighting
3. Energy savings and the power supplied/ required

Question 21

Electronic ballast that provides precise heating of lamp filaments and tightly controls the preheat duration…

Answer 21

Programmed start ballast

Question 22

Single pin contacts, no filament heating to ignite…

Answer 22

Slimline lamp

Question 23

Which type of HID lamp operates more like a fluorescent lamp?

Answer 23

Low pressure sodium

Question 24

Mercury vapor includes an internal____within the arc tube.

Answer 24

Probe

Question 25

What are two measures of the quality of white light

Answer 25

1 Color rendering index | 2 correlated color temperature

Question 26

Ability of magnet to retain magnetism

Answer 26

Retentivety

Question 27

Requires phase shift to start...

Answer 27

Single phase motor

Question 28

What are the fourpossibilities of using advanced micro processor based electronic ballasts in a building lighting system?

Answer 28

Daylight harvesting Load shedding Automatic lighting control Programmable scene lighting

Question 29

What are the three basic tasks of a ballast in a fluorescent lighting system?

Answer 29

Producing the appropriate starting voltage | Limit the current

Question 30

If the frequency is increased in an RC circuit, the resistance will _____.

Answer 30

Remain the same

Question 31

In a purely inductive circuit, the current____the supplied voltage by 90 degrees.

Answer 31

Lags

Question 32

3 elements required for induction to exist

Answer 32

Conductor Magnetic field Relative motion

Question 33

You run the risk of losing your IBEW membership if you owe more than____months of dues.

Answer 33

6

Question 34

The single most important thing you can do to stay safe is to_____.

Answer 34

Be aware

Question 35

The inductor always opposes a change in_____.

Answer 35

Current

Question 36

List 5 things that determine the amount of harm from electrical shock?

Answer 36

``` Frequency Amperage Length of time Position on the body Environment ```