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Exam 7: Power Supplies, Batteries, and Emergency Systems

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Question 1

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If the voltage on the primary of an isolation transformer is 48V, the voltage on the secondary will be _________.

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Question 2

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When transporting power over long distances, DC remains the best choice.

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Question 3

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According to the National Electrical Code, storage batteries and UPS's must be able to supply maximum load capacity for _______.

What component is used as a voltage regulator?

How can a technician float themselves and safely remove the risk for shock from the hot line?

According to the National Electrical Code, who is responsible for approving the periodic schedule for testing and maintaining an emergency system?

What type of device is used to limit peak voltage surges, while diverting power surges and transients to ground?

For what application is an engine-driven AC generator typically used?

A 1:1 relation exists between the primary and the secondary coils of the isolation transformer.

A capacitor is used to remove unwanted ripple from the output of a rectifier and will maintain a constant voltage regulation.

Give an example of a primary protector.

A switch mode power supply is considered to be ________.

What type of transformer has a single winding with an adjustable center tap?

According to the National Electrical Code, the AHJ must personally conduct or witness an emergency system test and verify its functionality in writing before using the system.

The secondary of an isolation transformer is usually grounded.

According to the National Electrical Code, all boxes and enclosures containing emergency systems must be clearly and permanently marked to indicate the presence of emergency circuits or systems.

List three differences between half-wave and full-wave/bridge rectifiers.

Motor-driven generators are able to provide DC-to-AC conversion.

Which type of battery needs to be fully discharged before recharging can take place?

A rectifier converts AC into pulsating DC.