Define the term electrical load
What will be an ideal response?
An electrical load is anything in a circuit that has resistance and uses power or current. The typical loads in an HVAC circuit are the fan motor, compressor motor, condenser motor, compressor resistance heater, the electrical resistance heating coil for an electric furnace. The coils of solenoids, motor starter, contactor or relay can also be identified as loads since they use power.
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Answer the following statement(s) true (T) or false (F)
1. Motors that used a centrifugal switch to disconnect the start windings cannot be used with variable voltage control.
2. Double-face clutches have both the armature and field discs mounted on the same hub.
3. The accompanying diagram has a double-face magnetic clutch.
4. Clutches cannot provide a smooth start for loads that can be damaged by sudden starting, or for high inertia loads such as centrifuges or flywheels
5. The problem with eddy current clutch circuits is that they lack a speed sensing device that automatically increases or decreases the DC excitation current when load is added or removed
Describe how controlling predators manage game
What will be an ideal response?
Which one of the following describes the left to right order of a feature control frame?
A. tolerance zone descriptor, geometric characteristic, geometric characteristic tolerance, primary datum reference B. geometric characteristic tolerance, geometric characteristic, tolerance zone descriptor, datum reference C. geometric characteristic symbol, tolerance zone descriptor, geometric characteristic tolerance, datum reference D. geometric characteristic symbol, material condition symbol, geometric characteristic tolerance, tolerance zone descriptor, multiple datum reference E. none of the above
Why is it important to limit the pressure in a chiller?
A) Chiller disks have low rupture thresholds. B) Heavy pressure will cause valve damage. C) Pressure gauges cannot detect high pressure levels. D) Chiller system hoses easily burst.