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33 Cards in this Set
- Front
- Back
- 3rd side (hint)
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A boiler with a steaming capacity of 27,117 lbs/hr would be rated at how many boiler horsepower? |
786 |
34.5 |
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If a boiler has a burner input of 6,900,000 Btu/hr, what would be its HP rating? |
200 HP |
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One mechanical horsepower is equal to |
33,000 ft-lb/min |
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What is the horsepower rating of a 10,000 kW steam turbine? |
13,400 hp |
1kw = 1.34 hp |
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86250 pounds of steam per hour equal how many boiler horsepower? |
2500 |
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What is the total horsepower of a plant that has three 350 hp boilers and one 500 kW steam turbine? |
1720 hp |
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What is a heating surface of water-tube, with a diameter of 3 1/2 inches and length of 20 feet |
18.32 sq. Ft |
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The heat absorbed by boiler water when changing from a liquid to steam called |
Latent heat |
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How many Btu’s are needed to change 5 pounds of water from ice at 0 degrees F to 212 F |
6550 BTU |
1 lb = 1310 BTU |
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The heat that is added to convert a liquid to a vapor at a constant temperature is called |
Latent heat of evaporation |
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In a boiler room there is an HRT boiler with the following dimensions: the drum is 96 inches in diameter and 36 ft long; there are a total of 90 tubes, 4 inches in diameter; and the boiler shell is bricked 1/3 of the distance from above. What is the total heating surface of the tube sheets, in square feet? |
84.78 |
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How much heat is required to change 2500 lb of water to steam at 212 F |
2,425,750 |
1 lb = 970 Btu |
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What is the quantity of heat needed to raise 40 lbs of air from 60 F to 550 F |
4704 BTU |
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What device uses electrical conductors and electromagnetic force to measure? |
Thermocouple |
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To take 2 lb of water from 32 F to 212 F requires how many BTU? |
360 BTU |
212-32=180 180*2lb= 360 |
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What type of temperature measuring device operates on the principle that electrical conductors resistance changes with temperature? |
Resistance temperature detector (RTD) |
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What is the purpose of a cold junction |
It is used as a reference point |
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The term viscosity cam best be defined as |
The specific gravity of an oil, the point at which oil starts to flow, the point at which oil starts to support combustion |
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What would a high pressure differential across a fuel oil strainer set indicate? |
A dirty fuel oil strainer |
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What must be done to any boiler firing system before startup to prevent furnace explosion or flashback |
Purge |
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What are the two most elements in fuel that produce most of it’s heat? |
Carbon and hydrogen |
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Which of the following is not the type of coal |
Carbonite |
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When making adjustments to the firing rate of a power boiler, why should the air be increased to the burner before the fuel |
To prevent incomplete combustion |
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What is the BTU content of natural gas? |
100,000 BTU/therm |
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An explosion or flashback in a boiler can be caused by |
Relighting an extinguished fire without purging |
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Which of the following, best defines the ratio of the total heat supplied by the fuel to the total heat absorbed by the boiler water? |
Thermal efficiency |
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Which type of coal has the highest carbon content? |
Anthracite |
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In boiler operation what is necessary for complete combustion? |
Atomization, time, mixture and temperature |
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What is the thermal efficiency % of a boiler with a stack temperature of 600 F and a furnace of 2800 psi |
78.5% |
((2800-600)/ 2800)* 100=78.5 |
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Before burner ignition, what is the minimum number of furnace volume air changes that should be provided by the purge cycle? |
4 |
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What type of oil burner provides atomization without the use of steam or air? |
The pressure-type burner |
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In a closed feedwater heater |
Steam and water do not mix |
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What are four categories of coal |
Anthracite, lignite, sub-bituminous, bituminous |
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