The two most common types of overcurrent protective devices are _____
A) circuit breakers and fuses B) safety switches and load centers
C) heaters and blowers D) Edison-base fuses and time-delay devices
A
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Explain the results of failing to obtain customer satisfaction, as well as the results of gaining customer satisfaction.
What will be an ideal response?
____ is/are the key for keeping a groomed appearance and keeping plants healthy
a. Pesticides c. Using fertilizer b. Spraying plants with water d. Sanitation
How does the flame rod sense the flames in a flame rectification circuit?
A) The flame rod expands from being heated, making a mechanical switch at its base B) The flame rod is made of a semiconductor material that acts as a silicon controlled rectifier when it is hot C) The resistance of the flame rod changes when heated by the flame D) The flame changes the AC voltage to pulsed DC current
What is a disadvantage of positive-pressure fans?
a. they can spread heat and smoke if used improperly b. they impede entry and exit of personnel c. favorable wind conditions are required for their use d. correct placement can be time consuming