Stationary Engineering Exam Questions and Answers for Boiler Operations, Exams of Engineering

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What is the pressure at the base of a vertical foot of water? - Correct Answer-0.433 psi How much should the boiler pressure increase when performing a hydrostatic test? - Correct Answer-1.5 times the safety valve setting The range of a boiler steam pressure gauge. - Correct Answer- 1.5 to 2 times the safety valve setting Fuel oil heaters must be used when burning what? - Correct Answer-No. 6 fuel oil What is the maximum allowable working pressure of a low pressure steam boiler? (MAWP) - Correct Answer-Up to 15 psi

A boiler generating 20,000 lbs of steam/hr must be supplied with at least how many pounds of water/hr? - Correct Answer-20,000 lbs Where do the heat and gases of combustion pass in a water tube boiler? - Correct Answer-Around the tubes The frequency of blowing down a steam boiler is best ascertained by? - Correct Answer-Daily testing of the water boiler What is an economizer used for in large boiler plants? - Correct Answer-To heat the feedwater using gases of combustion What kind of boiler is a horizontal return tubular? - Correct Answer-A fire tube boiler The part of a boiler that has heat and gases of combustion on one side and water on the other. - Correct Answer-Heating Surface

The amount of draft available in a natural draft system is dependent on what? - Correct Answer-The height of the chimney What must the boiler steam pressure gauge be connected to?

• Correct Answer-The highest part of the steam side of the boiler What is an indication of a dirty fuel oil strainer? - Correct Answer-A large pressure drop across the strainer What causes a scale buildup on the water side of the steam boiler? - Correct Answer-Improper water boiler treatment What are the types of boilers? - Correct Answer-Fire Tube Water Tube Cast-Iron Sectional How often should the water column and gauge glass be blown down? - Correct Answer-Once a shift

How many pounds of water are necessary to produce 1 pound of steam? - Correct Answer-1 lb of water What is the sequence of operation with a quick-opening valve, when blowing down a boiler equipped with both a quick- opening valve and a screw type valve? - Correct Answer-The quick-opening valve is opened first and closed last How is a steam pressure gauge calibrated? - Correct Answer-In pounds per square inch What is the purpose of a water column? - Correct Answer-To reduce turbulence in the gauge glass to get a more accurate reading of the water level Why should soot be removed from the boiler tubes? - Correct Answer-For better heat transfer What is the most important fitting on a boiler? - Correct Answer-The safety valve

Who is in charge of doing the repairs on a safety valve? - Correct Answer-The manufacture or manufacturer's authorized representative. The deposits of calcium and magnesium carbonates on the boiler heating surface can cause what? - Correct Answer- Scaling What is a direct cause of overheating boiler tubes? - Correct Answer-Scale formation on the tubes What are try cocks? - Correct Answer-A secondary means of determining water level in a boiler When is a high suction line on a fuel oil tank used? - Correct Answer-When signs of sludge and water are evident in the tank What is protecting the boiler steam pressure gauge from high temperatures? - Correct Answer-The siphon How are superheaters being prevented from overheating? - Correct Answer-Steam circulation

As steam pressure in a boiler increases, there is a corresponding increase in what? - Correct Answer- Temperature What must boilers operating at 100 psi or over have? - Correct Answer-Two bottom blowdown valves Boilers battery equipped with manhole openings must have what? - Correct Answer-Two main steam stop valves The boiler operator should first check what when taking over a shift? - Correct Answer-The boiler water level and blowdown the water column and gauge glass. This boiler was developed to provide steam at higher pressures. - Correct Answer-Watertube boiler Where is the mud drum located? - Correct Answer-At the lowest part of the water side of a watertube boiler.

How often should boilers be inspected internally and externally? - Correct Answer-Every year What is a boiler? - Correct Answer-A closed vessel used for heating water or generating steam by direct application of heat from combustible fuels or electricity What is a high pressure boiler? - Correct Answer-Power Boiler- S Above 15 psi steam Above 250°F water Above 160 psi water What is a low pressure boiler? - Correct Answer-Heating boiler-H Up to 15 psi steam Up to 250°F water Up to 160 psi water

What are the following BTUH limitations? - Correct Answer- B.O.P. = 1,676,000 output 1st Grade = No Limit 2nd Grade = 8,380, 3rd Grade = 3,352, What is saturated steam? - Correct Answer-Saturated with heat. Has a temperature that corresponds to the pressure that it was generated from. Define boiler horsepower - Correct Answer-The evaporation of 34.5 pounds of water per hour at the feedwater temperature of 212°F by adding 970.4 BTUs of latent heat per pound of water. Name the five positions of the boiler code and licensing board.

• Correct Answer-E-1 Professional engineer I-2 Installer of Boilers O-3 Boiler Operator (1st Grade 10+ yrs) U-4 User of Boilers C-5 Chief Boiler Inspector (Jim Harrison)

What are the four basic boiler systems? - Correct Answer-Fuel System Draft System Feedwater System Steam System What is a "pork chop?" - Correct Answer-Nickname for a cast- iron sectional What is the breaching? - Correct Answer-It is the connection between the boiler and the chimney or stack What is condensate? - Correct Answer-Steam that has given up its heat. What is "blowback" when referring to a safety valve? - Correct Answer-The difference in psi between when a safety valve pops open and then closes with a definite drop in pressure. Name two ways to test a safety valve. - Correct Answer-By Hand - Manual By Pressure - Accumulation

How many safety valves are required on a boiler with more than 500 ft.² of heating surface? - Correct Answer-2 or more What device inside the steam pressure gauge enables it to work? Who invented it and when? - Correct Answer-Bourdon Tube Eugene Bourdon In 1849 What are the two types of siphons and what is their purpose? What are they filled with? - Correct Answer-Pigtail and U-tube Keeps live steam out of the gauge Filled with water What is the location of the water column? - Correct Answer- Piped such that the top of the bottom gauge glass nut is 2 to 3 inches above the top row of tubes on a fire tube boiler and 3 inches on a water tube. Which blowdown valve is located nearest the boiler? - Correct Answer-The quick blowdown valve

The four reasons for using bottom blowdown valves. - Correct Answer-Reduce high water level Control chemical concentrations Remove sludge and sediment Dumping the boiler The ASME requires which boiler to have a fusible plug? Melting temp? What is the center made out of? - Correct Answer-Coal Fired 450°F Banca Tin What is the purpose of the boiler vent? - Correct Answer-To allow air into a boiler when dumping. To allow air out of a boiler when filling with water or steaming a cold boiler What is the purpose of the pressure control? - Correct Answer-Starts and stops the burner based on steam pressure demand

Water in the Steamline can lead to what? - Correct Answer- Water hammer and possible pipe rupture If the water level is too low in a boiler what is the possible result? - Correct Answer-Burnt out tube and heating surface or possible explosion What is the purpose of the feedwater check valve closest to the boiler? - Correct Answer-To keep the boiler water in the boiler and not let it back up into the feed water line What is the purpose of the stop valve closest to the boiler? - Correct Answer-You can replace the check valve without dumping the boiler What is the difference between a globe and a gate valve? - Correct Answer-A globe valve is used for throttling purposes. Gate valves offer no restriction to the flow. What does OS&Y stand for? - Correct Answer-Outside stem and yolk

What is the purpose of the low water cutoff? - Correct Answer-To secure the burner in the event of a low water level. How is the low water fuel cutoff tested? - Correct Answer-By blowing it down By an evaporation test How often is the low water fuel cutoff tested? - Correct Answer-Daily - By blowing it down Monthly - By the evaporation test What is the purpose of a feedwater regulator? - Correct Answer-To maintain the boilers water level Name the two sources for feedwater that a boiler has? - Correct Answer-Return Condensate Make-Up Water What device starts and stops the feedwater pump? - Correct Answer-The feedwater regulator

Which valve has a pressure drop through it? - Correct Answer- A globe valve What is the purpose of steam traps? - Correct Answer-1. To trap steam.

2. Vent air.
3. Remove condensate from steam lines. What is the purpose of a steam strainer? - Correct Answer-To keep rust and debris from entering the inlet side of a steam trap. The two types of steam traps are: - Correct Answer-Return and non-return The four kinds of steam traps are: - Correct Answer-1. Thermostatic
4. Float Thermostatic
5. Inverted Bucket
6. Thermodynamic

Name two tests for steam trap operation. - Correct Answer-1. Strap on thermometers

2. Temperature crayons What does it mean when a pump is steam bound? - Correct Answer-The water that is was pumping has become too hot and flashed into steam. This is usually caused by a "blowing" steam trap. What is combustion? - Correct Answer-The rapid uniting of fuel and oxygen for a release of heat. Air contains ______% oxygen and ______% nitrogen. - Correct Answer-20% oxygen and 80% nitrogen Define the three types of combustion. - Correct Answer- Perfect - Using the theoretical amount of air. Complete - Using a minimal amount of excess air. Incomplete - Unburned fuel

What does MATT stand for? - Correct Answer-Mixture Atomization Temperature Time Define primary air, secondary air and excess air. - Correct Answer-Primary air controls the rate of combustion. Secondary air controls combustion efficiency. Excess air is the amount above what is required for combustion. Define purge - Correct Answer-Acceptable method of scavenging the combustion chamber, boiler passes, and breeching to remove all combustible gases.