Exam (elaborations)

DC 3rd Class Test QUESTIONS WITH COMPLETE SOLUTIONS.

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Course
DC Boiler

Institution
Liberty University

DC 3rd Class Test QUESTIONS WITH COMPLETE SOLUTIONS. DC 3rd Class Test QUESTIONS WITH COMPLETE SOLUTIONS. DC 3rd Class Test QUESTIONS WITH COMPLETE SOLUTIONS. DC 3rd Class Test QUESTIONS WITH COMPLETE SOLUTIONS. DC 3rd Class Test QUESTIONS WITH COMPLETE SOLUTIONS. DC 3rd Class Test QUESTIONS W...

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Uploaded on November 6, 2024
Number of pages 54
Written in 2024/2025
Type Exam (elaborations)
Contains Questions & answers

dc 3rd class test questions with complete solution

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2024/2025 update DC Third Testing Questions

With Complete Solutions

1.The component in which liquid vapor by absorbing heat is

called?: evapo- rator

2.the best answer for an electrical grounding method?: Metal

stake drive 8 foot into the ground.

3.A valve should be used for throttling purposes?: Globe

4.What is the acceptable range for residual sodium sulfite in

the boiler main- tain?: 30-70

5.What is the BTU content of a gallon of #4 fuel oil?: 146,000

6.What does a zeolite water softener system use as a means of

regeneration?-

,: brine

7.What are the 4 steps for a Zeolite Rejuvenation water softener

process?: -

Backwash, Brine, Rinse, Service

8.Where medium temperature liquid found?: Condenser

9.Where is high temperature vapor found?: At the discharge of the

compressor or condenser

10.What stays are used to support the burner chamber in a

scotch marine boiler?: Diagonal Stays

11. What type of safety valve is this?: ( Full) Crosby nozzle-type

safety valve. Page 365 BOG

12.Where do you get superheat reading?: Take suction line pressure

13.Name the wire that connects all component of a system

,to a physical ground or water pipe?: Grounding electrode

conductor

14.Where do you get sub-cooling reading?: Take liquid

line pressure Cross reference to temperature using a P/T Chart

Get liquid line temperature

Subtract actual temperature from cross referenced

temperature Result is Sub cooling

15.On the boilers that have both Quick opening and Screw

type blow down valves, the Quick opening valve must be

located?: closest to the boiler and followed by the screw-type valve

16.High pressure boilers equipped with Quick opening and

Screw type valves are blown down how?: By opening the Quick

opening valve first and closing it Last.

, 17.ASME Code defines a slow opening valve as what?: One

requiring at least 5 full 360 degree turns between full open and close

position.

18.A 300 Horsepower boiler operating at 100psi has an average

load of 75% with 80% condensate return and 5% blow down.

The treatment provides a chemical which costs $8.75 per

gallon, and will treat 600 gallon. Find the amount of the

chemical needed for the day period, and the cost of the

chemical for a 30 days period?: Water In = Water Out

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Exam (elaborations)

DC 3rd Class Test QUESTIONS WITH COMPLETE SOLUTIONS.

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