Mechanical
This value represents the temperature difference between chilled water supply and return.
What is Delta-T
In an AC circuit, this quantity combines resistance and reactance and is measured in ohms.
What is impedance?
This sprinkler system requires both a fire detection signal and sprinkler activation before water discharge occurs.
What is double-interlock pre-action?
Telecommunications carriers often interconnect within this dedicated facility space.
What is a meet-me room?
Tom was everyone's first friend on this social media platform.
What is MySpace?
Excessive elbows, dampers, or transitions can increase this and reduce effective CFM delivery.
What is turbulence?
NFPA 70E uses calories per square centimeter to quantify this hazard.
What is arc-flash incident energy
FM-200 and Novec 1230 are examples of this type of fire suppression medium.
What is a clean agent?
This test instrument identifies fiber faults by measuring reflected light.
What is an OTDR?
This animal has three hearts and blue blood.
What is an octopus?
Phenomenon in centrifugal chillers where the refrigerant in the condenser exceeds the compressor's pressure capacity, causing it to flow backward into the compressor.
What is chiller surge?
This transformer configuration is commonly used to create a neutral for 480/277V systems.
What is a delta-wye transformer?
A sprinkler control valve is found partially closed, generating this type of fire alarm panel event.
What is a supervisory condition?
This wiring standard defines the pinout sequence for Ethernet terminations.
What is T568B?
This country chose a unicorn as its national animal.
What is Scotland?
This control system characteristic prevents excessive actuator movement around a setpoint.
What is Deadband?
These devices are the heart of a static transfer switch and enable near-instantaneous closed-transition transfers between synchronized power sources.
What are SCRs (Silicon-Controlled Rectifiers)
In many modern VESDA systems, smoke particles are detected using this technology.
What is a laser detection?
This cable design allows a single high-speed connection to be split into multiple lower-speed links.
What is Breakout Fiber?
A single rotation of this planet takes longer than its trip around the Sun.
What is a day on Venus?
This control action may occur when condenser capacity cannot keep up with heat rejection requirements.
What is compressor unloading
This phenomenon can reach 10 to 20 times full-load current and may cause nuisance tripping during energization.
What is transformer inrush current
VESDA design engineers pay close attention to this measurement between a sampling point and the detection chamber. It is verified and tested annually
What is a detector transport time?
Different wavelengths of light travel at different speeds through fiber because of this phenomenon.
What is chromatic dispersion?
This element makes up about 21% of Earth's atmosphere but was not discovered until the 18th century.
What is oxygen?