As discussed in class, a common power flow load model is to assume the load is constant power. That is, with no voltage dependence. Why might this be an appropriate model for a resistive heater in which the instantaneous power consumed varies with the square of the voltage?
What will be an ideal response?
Electric heaters are often controlled by a thermostat, so in aggregate they behave as constant energy loads, hence a constant power model is appropriate for the power flow time frame;
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What is the drawback of emergency heat?
A) The supplemental heat costs more to operate than a heat pump. B) It causes problems with the refrigeration systems. C) The compressor and outdoor fan are not energized. D) It activates the supplemental heat in the first stage.
What information do label diagrams provide?
A) They include a component arrangement diagram, a wiring diagram, a legend, and notes. B) They identify the system operating voltage, minimum circuit ampacity, and maximum overcurrent protection. C) They explain how to read the labels on the equipment. D) They identify where all the manufacturer's data plates and model numbers are located on the system
A misfire diagnostic trouble code (DTC) is stored for cylinder #4 (P0304) on a coil-on-plug EI system. Preliminary testing of components following manufacturer's recommended procedures are within acceptable ranges. Technician A says that water may have intruded into the recessed spark plug well in the cylinder head. Technician B says that the ignition extension tube should be inspected for carbon tracking. Who is correct?
A. A only B. B only C. both A and B D. neither A nor B
A transaxle for a front-wheel drive car is usually mounted cross-wise with the engine.
Answer the following statement true (T) or false (F)