You are the Administrator in charge of the Certkiller servers and you want to know from the new Certkiller trainee what size UPS VA rating will be required for your server to have 20-minutes power to perform a proper shutdown if you use a 4A Monitor, 2A speakers and a 10A power supply, which of the following UPS should be used for the server?

A.
4000

B.
3820

C.
4200

D.
4500

Explanation:
The best way to calculate the values given in watts is to add them together and divide by 0.6, If your power is rated in Amps remember that this value must be multiplied to the amount of volts the device uses, adding a UPS with half the calculated VA value will only provide 5-minutes power, the exact required VA as you calculated should give you 10-minutes and if the UPS VA rating is double that you calculated the system will be powered for 20-minutes.
Incorrect Answers:
A, C, D: All of the other mentioned UPS VA ratings are capable of handling the Certkiller server but the question wants you to provide 20-minutes backup power.
Reference:
Server+ Exam Cram 2 (Exam SK0-002), Charles J. Brooks, Que, November 2005, pg