When selecting a transformer, its ____ is the first concern.
A. primary power rating
B. frequency
C. secondary voltage and current ratings
D. power-handling capability
Answer: A
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Answer the following statement(s) true (T) or false (F)
1. An electrician must know the symbols and terms used in automatic control diagrams to be able to wire, install, troubleshoot, and maintain automatic control equipment. 2. Remote control of a controller uses contactors, relays, pushbuttons, sensors, and possibly electronics. 3. Magnetic switches used in controllers cannot be used with remote control and are expensive. 4. The manufacturing and materials-handling industries can predict maintenance with great certainty and help with failure analysis based on E stop systems. 5. SCADA connections and RTUs and HMIs are increasingly being connected through systems that uses a manufacturer-specific protocol for each component.
Technician A says that leather shoes offer more protection than canvas shoes. Technician B says that steel toed boots are essential to protecting your feet from injury. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
What are the two manual switches found on most thermostats?
What will be an ideal response?
A diode passes current when its anode is
A) more positive than its cathode. B) a positive voltage. C) at 0 V. D) more negative than its cathode.