The rotation of an ECM motor is determined by:
A) The polarity of the start winding. B) The module program.
C) The polarity of the power into the motor. D) The internal motor wiring.
B
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A refrigerator is to cool 2 kg of water (at atmospheric pressure) from 40°C to 5°C. The coefficient of performance of the refrigerator is 3.10. Determine the work needed to operate the refrigerator during this cooling process.
Given: Water; m = 2 kg; T1 = 40°C; T2 = 5°C; B= 3.10 Assume: The water behaves as an incompressible substance with constant specific heats: c = 4.18 kJ/kg-K. For the water as a system, W = ?KE = ?PE = 0
Which of the following receiver techniques for improving communication is probably most
important?
a. Developing good listening skills b. Being sensitive to the sender's point of view c. Being aware of meanings other people use for words d. Asking appropriate questions e. Being patient
Once used on all vehicles, sealed beams headlights have been replaced by ____________________ bulbs.
Fill in the blank(s) with the appropriate word(s).
The halogen family of chemicals includes:
A) Carbon and hydrogen. B) Chlorine, fluorine, and bromine. C) Oxygen, carbon, and hydrogen. D) All the chemical elements found in refrigerants are halogens.