The vacuum pump is used to evacuate air conditioning and refrigeration systems. The process of evacuation involves the __________ and __________ of the system. Degassing involves the removal of air, nitrogen and other __________ from the system, while dehydration involves the removal of __________ from the system.
What will be an ideal response?
degassing, dehydration, noncondensables, water vapor
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Carbon brushes that ride on the slip rings provide electricity to the field coil.
Answer the following statement true (T) or false (F)
Technician A says that you must not use steel hammers to remove a U-joint from a yoke.Technician B says that if you need a hammer, use a brass or copper one to avoid damaging the forward yoke or hardened bearing caps. Who is correct?
A. Technician A B. Technician B C. Both D. Neither
Consider the LED driver circuit of Figure 10.17. This circuit is now used to drive an automotive fuel injector (an electromechanical solenoid valve). The differences in the circuit are as follows: The collector resistor and the LED are replaced by the fuel injector, which can be modeled as a series RL circuit. The voltage supply for the fuel injector is 13 V (instead of 5 V). For the purposes of this problem, it is reasonable to assume R = 12 ? and L ? 0. Assume that the maximum current that can be supplied by the microprocessor is 1 mA, that the current required to drive the fuel injector must be at least 1 A, and that the transistor saturation voltage is VCEsat = 1 V. Find the minimum value of ? required for the transistor.
Known quantities:
For the circuit shown in Figure 10.14 in the text:
Find:
Minimum value of ? that will ensure the correct operation of the fuel injector.
Horizontal silos include the trench, bunker, and stack types
Indicate whether the statement is true or false.