FREE AND STUDY GAMES ABOUT CODEOLOGY 4 EXAM

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FREE AND STUDY GAMES ABOUT CODEOLOGY 4 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -36 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: A circuit breaker with a special "straight" rating of 277/480 volts may be used on a corner-grounded delta system.

Answer:

False Note: "Straight" rated circuit breakers are rated at 240, 480, or 600 volts and not 277/480 volts; which is a slash rating

Question 2: How can it be determined if a circuit breaker is current-limiting?

• All 200 A or less circuit breakers are current-limiting
• It will be marked "Current-Limiting"
• It will have an interrupting rating greater than 10kA
• None of the above

Answer:

It will be marked "Current-Limiting" Correct

Question 3: The value of current, time, or both, at which an adjustable circuit breaker is set to trip.

Answer:

Setting Question 4: A qualifying term indicating that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range.

Answer:

Adjustable

Question 5: What is the interrupting rating for LVPCBs?

Select one:

• From 0 kA to 100,000 kA
• From 25 kA to 300,000 kA
• From 42 kA to 200 kA
• From 100 kA to 300 kA

Answer:

• From 42 kA to 200 kA

Question 6: What is/are the common operating function(s) that mechanical OCPDs share?

• Current/voltage interruption means
• Current-sensing means
• Unlatching mechanism
• All of the above

Answer:

• all of the above

Question 7: Which is not a category for overcurrent devices?

a.Application limited OCPDs suitable for specific branch-circuit applications, under limited conditions

• Branch-circuit OCPDs

• Nonautomatic OCPDs
• Supplementary OCPDs

Answer:

Nonautomatic OCPDs Question 8: NFPA 70E 225.3 Circuit Breaker Testing states that "Circuit breakers that interrupt faults approaching their ratings shall be inspected and tested in accordance with the manufacturer's instructions."

Answer:

True Question 9: The long-time pick-up (LTPU) and long-time delay (LTD) determine the overload protection characteristics of an adjustable electronic circuit breaker. The typical adjustment range for the LTPU is from ? times the circuit-breaker ampere rating.

• 0.25

Answer:

0.5 to 1.0

Question 10: Molded Case Circuit Breakers

Answer:

489 Question 11: A qualifying term indicating that no delay is purposely introduced in the tripping action of the circuit breaker.

Answer:

Instantanious Trip

Question 12: Insulated Case Circuit Breakers

Answer:

489

Question 13: Low-Voltage Power Circuit Breakers

Answer:

1066

Question 14: A specific MCP (motor circuit protector) can only be utilized with a motor starter that is listed for use with that MCP.

Answer:

True

Question 15: Test

The operating mechanism, including the handle, opens or closes the circuit breaker contacts.

Answer:

true Question 16: Interrupting ratings on AC rated circuit breakers are used for ? .

Select one:

• AC systems only
• DC systems only
• both AC and DC systems
• none of the above

Answer:

AC systems only Question 17: Supplementary overcurrent protection is used for luminaires, appliances, and other equipment and can be used as a substitute where branch-circuit overcurrent devices are required.

Answer:

False Question 18: Low-voltage power circuit breakers are the most rugged, highest priced, and largest size circuit breakers and are used in larger ampacity circuits in main switchgear and unit substations.

Answer:

true