In an emitter-bias circuit
A) you require two power supplies B) the DC emitter voltage is always negative
C) VB ? 0 V D) All of the above
C, D
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Discuss what a designer must consider as a part is planned.
What will be an ideal response?
You could use your "sense of feel" to determine if a fan or other part of the system is vibrating excessively
Indicate whether the statement is true or false
Which of the following statements about converting a system from one refrigerant to another is incorrect?
a. Synthetic and mineral oils are completely compatible. b. A new metering device may be required. c. Equipment capacity may change with the new refrigerant. d. Gaskets and O-rings may have to be changed.
The main valve in a pilot-operated four-way reversing valve is moved by pressure created by the ____.
A. refrigerant boiling in the coil B. pressure reduction in the condenser C. change in the action of the metering device D. low and high side pressure difference