The performance of an air conditioning system can be determined by measuring the airflow and
A) The dry bulb temperature difference across the evaporator coil
B) The wet bulb temperature difference across the evaporator coil
C) The dry bulb temperature difference across the condenser
D) The wet bulb temperature difference across the condenser
B
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IDENTIFY TEST PROCESS SYMBOLS AND DIAGRAMS
When measuring customer satisfaction you need to be aware of the silent majority because _______
A) Most people are too busy to take the time to complain B) Many people that are dissatisfied will not complain C) People sometimes do not complain, they just go away mad D) All of the above
For the electromagnet of Example 18.9:
a. Calculate the current required to keep the bar in place. (Hint: The air gap becomes zero, and the iron reluctance cannot be neglected.) Assume ?r = 1,000, L = 1 m.
b. If the bar is initially 0.1 m away from the electromagnet, what initial current would be required to lift the magnet?
Example 18.9
An electromagnet is used to collect and support a solid piece of steel, as shown in Figure 18.38. Calculate the starting current required to lift the load and the holding current required to keep the load in place once it has been lifted and is attached to the magnet. Assume that the cross-sectional areas of the electromagnet, load (bar), and air gap are equal.
Assumptions:
a) Air gap becomes zero and the iron reluctance cannot be neglected
b) Neglect the iron reluctance
In order to reduce duct leakage, ducts should be sealed with _____.
a. mastic b. duct tape c. electrical tape d. paint