Which of the following is a passive device that protects electrical components from spikes in the power line?

A.
A power conditioner.

B.
A surge protector.

C.
A generator.

D.
An Uninterruptible Power Supply (UPS).

Explanation:
Surge protectors are passive devices that are used to protect electrical components from spikes in the power line. Surge protectors usually utilize Metal Oxide Varistors (MOVs) to shunt the voltage spike to ground.
Incorrect Answers:
A: Power conditioner devices assist in keeping the electrical service constant by monitoring and regulating the power in the building. These devices can activate backup power supplies.
C: A generator is used when a continuous power supply is needed in power loss situations and is activated when a loss in power is detected. It does not protect electrical components from spikes in the power line.
D: An Uninterruptible Power Supply (UPS) system is a backup power system that utilizes batteries to provide short-term power when a power loss is detected. It also protects against spikes but is not passive.
References:
Mike Pastore and Emmett Dulaney, Security+ Study Guide, 2nd Edition, Sybex, Alameda, 2004, p 249.
Andy Ruth and Kurt Hudson, Security+ Certification Training Kit, Microsoft Press, Redmond, 2003, Chapter 9, Lesson 1
Todd Bill, The Security+ Training Guide, QUE Publishing, Indianapolis, 2003, Chapter