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DC Third testing questions with correct answers
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DC Third testing questions with correct answers 
The component in which liquid vapor by absorbing heat is called? -Correct Answer-Evaporator 
 
Select the best answer electrical grounding method? -Correct Answer-Metal stake drive 8 foot into the ground. 
 
A _____ valve should be used for throttling purpose? -Correct Answer-Globe 
 
What is the acceptable range for residual sodium sulfite in the boiler maintain? -Correct Answer-30-70 
 
What is the BTU content of a gallon of #4? -Correct Answer-...
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Boiler Exam sample questions
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Boiler Exam sample questions
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BUNDLE FOR Boiler Operator Licensing Exam Questions with Correct Answers
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Boiler Operator Licensing Exam Questions with Correct Answers
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Boiler Operator Licensing 
Exam Questions with 
Correct Answers 
1 or more safety valves - Answer-all steam boilers must have 
Locked closed - Answer-before anyone enters the boiler drum, the main steam stop 
valve, bottom blowdown valves, & feedwater valves should be 
212 degrees F - Answer-at atmospheric pressure, water begins to boil at approximately 
Fuel oil, gas, & coal - Answer-fuels most commonly used in boilers 
Steam pressure gauge - Answer-must be connected to the highest part of t...
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Boiler Operator Licensing Exam Questions with Correct Answers
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Boiler Operator Licensing 
Exam Questions with 
Correct Answers 
1 or more safety valves - Answer-all steam boilers must have 
Locked closed - Answer-before anyone enters the boiler drum, the main steam stop 
valve, bottom blowdown valves, & feedwater valves should be 
212 degrees F - Answer-at atmospheric pressure, water begins to boil at approximately 
Fuel oil, gas, & coal - Answer-fuels most commonly used in boilers 
Steam pressure gauge - Answer-must be connected to the highest part of t...
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Boiler License Test Questions with Correct Answers
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Boiler License Test 
Questions with 
Correct Answers 
Natural draft is produced by? - Answer-difference in temperature outside chimney from 
inside chimney 
If a draft fan is located between the boiler and chimney, what type of draft system is it? - 
Answer-Induced draft 
boiler fittings are important for: - Answer-safety only 
thermostatic traps remove air and cool condensate: true or false - Answer-True 
The main purpose of testing a safety value is to: - Answer-make sure valve operates 
fr...
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Boiler License Low Pressure Exam Questions with Correct Answer
- Exam (elaborations) • 5 pages • 2024
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Boiler License Low 
Pressure Exam 
Questions with 
Correct Answers 
A welded repair is allowed on the pressure retaining area of a boiler or pressure vessel - 
Answer-True 
An OS&Y valve offers the least resistance to flow - Answer-True 
What chemical prevents pitting - Answer-Sodium Sulfite 
A rotary cup burner atomizes fuel - Answer-by means of a spinning cup/high velocity air 
Retubed or new boilers are cleaned with - Answer-Alkaline Detergent 
Where does fuel atomize - Answer-At the burne...
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Boiler License Exam Questions with All Correct Answers
- Exam (elaborations) • 9 pages • 2024
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Boiler License Exam Questions 
with All Correct Answers 
When applying the 90% rule to the output of 500 HP, its output would be - Answer15525 pph 
A high pressure boiler can be used in a low pressure situation: - Answer-sometimes 
It takes BLANK BTUs to raise 5 pounds of water from 200 to 212 degrees F - Answer60 
Minnesota Operators license are renewed every - Answer-2 years 
The circumference of a circle with a radius of 3 inches is - Answer-18.84 inches 
For Minnesota Operators licensing ...
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Boiler license Exam Questions and Correct Answers
- Exam (elaborations) • 13 pages • 2024
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Boiler license Exam 
Questions and 
Correct Answers 
The primary purpose of establishing plant safety rules is to: - Answer-protect workers 
and equipment 
How are the sections of a cast-iron boiler connected? - Answer-push nipples and bolts 
Cast-iron boilers are built for what type of draft firing? - Answer-mechanical forced 
and/or induced 
What is the maximum pressure of a low pressure steam boiler? - Answer-15 psi 
What is the maximum temperature and pressure of a low pressure hot water ...
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Boiler Operator Licensing Exam Questions with Correct Answers
- Exam (elaborations) • 8 pages • 2024
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- $12.49
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Boiler Operator Licensing 
Exam Questions with 
Correct Answers 
1 or more safety valves - Answer-all steam boilers must have 
Locked closed - Answer-before anyone enters the boiler drum, the main steam stop 
valve, bottom blowdown valves, & feedwater valves should be 
212 degrees F - Answer-at atmospheric pressure, water begins to boil at approximately 
Fuel oil, gas, & coal - Answer-fuels most commonly used in boilers 
Steam pressure gauge - Answer-must be connected to the highest part of t...
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