Describe why it is important to replace a fan motor with one of the exact same RPM
What will be an ideal response?
Some operate around 1000 rpm while others may operate around 800 rpm. The fan blades are designed to move air at a certain speed. If the fan blade is spinning faster than it was designed for, it will not operate as efficiently. Increasing the rpm does not mean that you are going to increase the airflow. In most cases the current draw and the temperature of the condenser fan motor will increase causing the motor circuit to open on its thermal load. The worst case scenario is that the motor will be burned out. If this were to occur in a system where there are no compressor pressure switches the compressor could be damage beyond repair.
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A silicon-controlled rectifier (SCR):
A) Turns AC voltage to DC voltage. B) Can be turned on and off like an electronically controlled switch. C) Increases or decreases alternating current voltage. D) Turns DC voltage to AC voltage.
What is the proper instrument for measuring runout?
A) Inside micrometer B) Vernier caliper C) Outside micrometer D) Dial indicator
An overload device may be mounted internally in a compressor or externally to detect heat on the compressor shell
Indicate whether the statement is true or false
Technician A says that direct damages are the result of energy having traveled through the vehicle’s structure. Technician B says that indirect damages are found in the area of the direct impact to the vehicle. Who is right?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B