4th Year Final Flashcards
Name two main functions of control devices in electrical sustenance
- Monitoring and maintain the quality of the power
2. switching electrical loads
What three conditions will require shutdown of the supply air fan?
- Signal from fire alarm control panel to shutdown
- Close isolation damper
- Reaching low temperature limit
What type of control system uses only one controller to run all system logic?
DDC Control
What condition aids in keeping contagion from entering an isolation room?
Positive relative pressure
____time is the time it takes a programmable controller to make a sweep of the program.
Scan
The output module sends a signal to a control field device, the power needed to energize the field device is provided by____.
Separate power source
The current output of a solar cell depends on_____.
Temperature
Irradiance
Operating voltage
Which effects size and cost of any standalone photovoltaic system?
Load energy consumption
Solar___is the total amount ofsolar energy accumulated on area over time.
Irradiation
When reading PLC ladder logic,a good rule to adhere to is “follow the current flow.”
True or False
False
PLCs are___designed for use in the control of a wide variety o fmanufacturing machines and systems.
Special purpose industrial computers
Actuated by a separate electrical circuit…
Relay
In PLC programming, the term “force”refers to….
Overriding a program input value by using the PLCs software
A solar irradiance level of 1000W/m2 is commonly associated with____.
Module output ratings
Wallwasher luminaries are said to have ____form of light distribution.
Asymmetric
A light emitted from a metal object heated to the point of incandescent, best describes____light operation.
Halogen
Two major principles to controlling lighting systems. Controlling___and controlling____.
Power, time
What are two broad categories that HID and fluorescent ballasts fall into?
Magnetic and electronic
3 fluorescent lamp starting techniques?
Rapid start
Instant start
Programmed rapid start
Four main considerations or concepts to apply to lighting technology
- Matching lights to the application or area
- Color characteristics of the lighting
- Energy savings and the power supplied/ required
Electronic ballast that provides precise heating of lamp filaments and tightly controls the preheat duration…
Programmed start ballast
Single pin contacts, no filament heating to ignite…
Slimline lamp
Which type of HID lamp operates more like a fluorescent lamp?
Low pressure sodium
Mercury vapor includes an internal____within the arc tube.
Probe
What are two measures of the quality of white light
1 Color rendering index
2 correlated color temperature
Ability of magnet to retain magnetism
Retentivety
Requires phase shift to start…
Single phase motor
What are the fourpossibilities of using advanced micro processor based electronic ballasts in a building lighting system?
Daylight harvesting
Load shedding
Automatic lighting control
Programmable scene lighting
What are the three basic tasks of a ballast in a fluorescent lighting system?
Producing the appropriate starting voltage
Limit the current
If the frequency is increased in an RC circuit, the resistance will _____.
Remain the same
In a purely inductive circuit, the current____the supplied voltage by 90 degrees.
Lags
3 elements required for induction to exist
Conductor
Magnetic field
Relative motion
You run the risk of losing your IBEW membership if you owe more than____months of dues.
6
The single most important thing you can do to stay safe is to_____.
Be aware
The inductor always opposes a change in_____.
Current
List 5 things that determine the amount of harm from electrical shock?
Frequency Amperage Length of time Position on the body Environment
