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# MA Boiler Questions

### Questions for MA fireman's and engineer's license

Question | Answer |
---|---|

Convection | Heat transfer through fluid medium of liquids or gases |

Radiation | Heat transfer by light waves |

Conduction means | Heat transfer by direct molecular contact |

1 in. Hg =psi | 0.491 psi |

1 psi = Feet of Water | 2.31 ft |

1 Foot of Water = psi | 0.433 psi |

1 hp = kW | 0.746 kW |

1 hp = ft-lb/min | 33,000 ft-lb/min = 1hp |

1 hp = Btuh, Horsepower Hour | 2,545 Btuh = 1 hp |

1 kW = hp | 1.34 hp = 1 kW |

1 kw = Btuh | 3,413 Btuh = 1 kW |

1 gal. = in3 | 231 in3 = 1 gal. |

1 gal. = lb water | 8.33 lb water = 1 gal. |

Cubic foot of water = gallons | 7.48 gallons = 1 cubic foot of water |

Cubic foot of water = square inches | 1,728 square inches = 1 cubic foot of water |

1 Boiler horsepower = evaporation | Evaporation of 34.5 lb water/hour from and at 212° F to steam = 1 boiler horsepower |

1 Boiler horsepower = BtuH | 33,475 Btuh = 1 boiler horsepower |

°F = °C | (°C x 9/5) + 32 + °F |

°C = °F | 5/9(°F-32) |

How many Btu does it take to raise 1 lb of water 1°F | One Btu raises 1 lb of water 1°F |

1 Btu = ft-lb of work | 778 ft-lb of work = 1 Btu |

Atmospheric pressure = lbs | 14.7 lbs atmospheric pressure at sea level |

Atmospheric pressure = maximum water column | 34 feet. Atmospheric pressure, 14.7 lb, will sustain a water column 34 ft high |

Maximum column of mercury,)Hg) @ atmospheric pressure | 29.92 inches Atmospheric pressure, 14.7 lb, will sustain a column of Hg a maximum of 29.92 inches |

Area of a circle = | 0.7854d² --- Diameter Squared times 0.7854 |

Circumference of a circle = | πd --- 3.14 x diameter |

Torque = | (5,252 x hp)/rpm = torque |

Btu per lb of oil = | 17,780 + (54 x API gravity) = Btu per lb of oil |

Heating value of coal = | 14,000 Btu per lb = coal heating value |

Heating value of fuel oil = | 19,000 Btu per lb = heating value of fuel oil |

Btu per lb of oil = | 17687 + (57.7 x API gravity) |

Longitudinal Stress = | pd/4t = longitudinal stress |

Circumferential stress = | pd/2t |

For what types of services are pumps used in a power plant? | In a power plant pumps are used for general utility service, cooling water, boiler feed, and lubrication. |

What pumps are required in a basic steam power plant cycle? | A basic power plant cycle requires 3 types of pumps, a condensate pump, a boiler feed pump, and a circulating water pump. |

Condensate pump - describe its purpose. | A condensate pump transfers condensate from the condenser hot well to the deairator. |

Boiler feed pump - describe its purpose. | A boiler feed pump pumps feedwater from the feedwater heaters to the economizer or boiler steam drum. |

Circulating water pump - describe its purpose. | A circulating water pump provides cooling water through the condenser to condense the exhaust steam from the turbine. |

What are the two major categories of pumps? | DYNAMIC and DISPLACEMENT: DYNAMIC such as centrifugal pumps in which energy is continuously added to increase fluid velocities, and DISPLACEMENT such as reciprocating pumps in which energy is added periodically |

Which high pressure boilers are exempt from Chapter 146 licensing requirements? | 146, 46 Exemptions, < 9hp, locomotives, private residences, motor vehicles (ships), apartment houses with less than 5 units, under US jurisdiction, agriculture, limit device <=15lbs |

Which boilers require periodic attendance? | Boilers and engines between 9 to 250 hp in the aggregate require periodic attendance unless otherwise exempt. |

Which boilers require noncontinuous attendance? | Boilers and engines between 251 to 500 hp in the aggregate require noncontinuous attendance unless otherwise exempt. |

Which boilers require continuous attendance? | Boilers and engines of 501 hp in the aggregate shall require continuous attendance unless otherwise exempt. |

How long can an owner operate a boiler without having a licensed person in charge? | One week, the owner cannot operate a boiler, engine, or its appurtenances for more than seven days without having a licensed person in charge. |

Define continuous attendance. | Continuous attendance is manned attendance by a licensed operator during all times of operation. It applies to boilers above 500 hp. |

Define periodic attendance. | Periodic attendance is applies to boilers of 9-250 hp. A licensed engineer performs daily maintenance and remains in the same building as the boiler, boiler has automatic shut-down devices. Visits to boiler are recorded in department log book. |

Define noncontinuous attendance. | Noncontinuous attendance applies to boilers of 251-500 hp. In addition to the duties of periodic attendance a remote monitoring station must be in place that can shut the boiler down and a licensed operator shall inspect the boiler 4-6 times per shift. |

What is the maximum external diameter for a steam supply pipe for a turbine of less than 9 hp. | 1 3/4": A steam turbine engine shall be rated at less than 9 hp when the external diameter of the steam supply pipe does not exceed 1 3/4". |

What is the maximum external diameter for a steam supply pipe for a 50 hp turbine? | 3 1/2": Turbines are rated up to 50 hp when the external diameter of the steam supply pipe exceeds 1 3/4" and does not exceed 3 1/2". |

What is the maximum external diameter for a turbine over 50 hp, but not more than 150 hp? | 5": A turbine will be rated over 50 hp and up to 150 hp when the external diameter of the steam supply pipe exceeds 3 1/2", but does not exceed 5". |

How many BTU's in a boiler horsepower? | 33,475 Btu in one boiler horsepower bhp. 34.5 x 970.3= 33,475.35 |

Define boiler horsepower? | One boiler horsepower is the evaporation of 34.5lbs of water at 212°F to 34.5lbs of steam at 212°F. (note output is 80% of input so 41840x.8=33,472) |

Btu in a horsepower hour | 2,545 |

Btu in a Kilowatt hour, kWh | 3,413 |

What is required to sit for a 3rd engineer’s license? | Must be Citizen or filed declaration, Training & experience. Employed as Engineer, Fireman, Auxiliary, Control Operator, Assistant, Watertender, at least 1 ½ Years. Held and used 1st Fireman’s , Merchant Marine , or other State at least 1 year. |