Effective Use of NFPA 110 for Mission Critical Applications

 

September 16, 2010

Exam for Continuing Education Units

 

1.0  learning units (0.1  CEUs)

 

You must get 8 of 10 questions correct to pass the exam. You may retake the exam if necessary. You will be notified whether you passed or failed automatically after taking the exam. Upon passing the exam, a hardcopy certificate will be mailed within 30 days to you at the address you provide below.

 

 

CEU Exam: 9/16/2010 Webcast


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Question 1 *

Why does an alternator voltage dip curve often optimistically predict
genset voltage dip performance?

 

Generator set manufacturers often provide data for the incorrect machine
Alternators generate voltage dip curves based on calculations from typical models, not specific machine performance
Voltage dip curves, per NEMA requirements, report voltage dip assuming constant rotational speed. Load changes cause engine speed changes and these cause the generator set AVR to drop voltage intentionally
All of the above
Question 2 *

Why is prototype testing necessary for a generator set used in a critical application?

 

It validates the performance of a generator set under unusual conditions that may cause hidden damage or shortened life to the machine
It prevents the generator set from failing under any condition that might occur in a real world application
It demonstrates the transient performance of a specific machine to verify that it meets design requirements
It allows a manufacturer to avoid claims of poor performance due to inadequate design
Question 3 *

Why are single phase short circuits potentially more damaging than 3-phase faults in a generator set application?

 

Single phase fault current does not significantly decay, so faults must be cleared more quickly to avoid damage
Single phase fault current magnitude is usually higher than 3-phase fault current
Single-phase faults can cause overvoltage conditions that can damage loads before the genset can be shut down
All of the Above
Question 4 *

Short-circuit testing is specifically required:

 

Question 5 *

Connection provisions include:

 

Question 6 *

One or more reason to test whole genset package vs. only components

 

Question 7 *

Most loads served by generator sets are linear

 

Question 8 *

For voltage regulators, the speaker recommend that engineers specify 3-phase sensing, full-wave rectified FET type AVR, with PMG (option)

 

 

Question 9 *

What statement  is true about slew rates?

 

Question 10 *

NFPA 110-2010 allows safety tests to be conducted at the factory