What is the mechanism behind the operation of a thermal circuit breaker?
What will be an ideal response?
One method of sensing circuit current is through the production of heat. These breakers are often referred to as thermal circuit breakers. Thermal circuit breakers generally use some type of heating element inserted in series with the load. The heater is located close to a bimetallic strip. The bimetallic strip is mechanically connected to the movable contacts of the circuit breaker. When there is a current through the heater, it causes the bimetallic strip to bend or warp. If the current is higher than a predetermined limit, the bimetallic strip will warp far enough to cause the contacts to snap open.
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A fire that has been started in electrical wiring should be extinguished with a fire extinguisher suitable for:
A. A type fires B. B type fires C. C type fires D. D type fires
A dealer has poor customer satisfaction and the manufacturer procedures are not being followed. What will likely happen next?
A. The manufacturer will send a factory representative to the dealer to troubleshoot the problems B. The manufacturer will offer an incentive program to the dealer C. The service manager will be fired D. The owner will sell the business
Centerlines are used to indicate that an object is ____.
A. 3-D B. 2-D C. asymmetrical D. symmetrical
Which of the following common welding components are missing from the aluminum GTAW process, resulting in minimal corrosion from slag entrapment?
a. Flux b. Argon c. Inert gas d. Backing gas