MA 2nd Class Fireman's Practice Exam WITH A+ GRADED

At 0 PSIG, how many BTU are necessary to change 1 lb of water at 212 degrees Fahrenheit into 1 lb of steam? a) 144 b) 180 c) 970 d) 1,190 - CORRECT ANSWERS-c) 970 Radiation is a) the movement of liquids or gases created by a temperature difference. b) the transfer of heat by direct molecular contact. c) the weight of a substance compared to unity. d) a form of heat transfer by waves. - CORRECT ANSWERS-d) a form of heat transfer by waves. Steam at 100 PSI and 400 degrees Fahrenheit is a) saturated. b) wet. c) superheated. d) none of the above. - CORRECT ANSWERS-c) superheated Which of the following most closely defines sensible heat? a) An established relationship comparing any substance to the heat content of water b) Heat quantity that can be felt or measured by a thermometer. c) Heat quantity above the point of saturation d) Measure of heat intensity. - CORRECT ANSWERS-b) Heat quantity that can be felt or measured by a thermometer What is required to raise the temperature of 1 lb of water from 32 degrees to 212 degrees Fahrenheit? a) 144 Btu b) 180 Btu c) 970.3 Btu d) Saturated heat - CORRECT ANSWERS-b) 180 Btu Increasing the pressure has what effect on the boiling point of water? a) No change b) Temperature will be lowered c) Temperature will be raised d) Temperature will increase 2 degrees Fahrenheit for every PSI - CORRECT ANSWERS-c) Temperature will be raised Heat absorbed by water when it changes from liquid to steam at the boiling point is called a) sensible heat. b) latent heat. c) specific heat. d) superheat - CORRECT ANSWERS-b) latent heat Heat may be transferred in how many ways? a) One b) Two c) Three d) Four - CORRECT ANSWERS-c) Three A boiler horsepower is defined as a) 970.3 Btuh. b) total heating surface times the factor of evaporation. c) evaporation of 34.5 lb of water from and at 212 degrees Fahrenheit per hour d) evaporation of 34.5 lb of water from and at 212 degrees Fahrenheit per 8 hours. - CORRECT ANSWERS-c) evaporation of 34.5 lb of water from and at 212 degrees Fahrenheit per hour A boiler's steam pressure gauge reads 150. What is the absolute pressure? a) 14.7 b) 135.3 c) 150 d) 164.7 - CORRECT ANSWERS-c) 150 What does 212 degrees F equal on the Celsius scale? a) 32 b) 100 c) 180 d) 970.3 - CORRECT ANSWERS-b) 100 One boiler horsepower is equal to how many Btu? a) 970.3 b) 33,472 c) 125,000 d) One therm - CORRECT ANSWERS-b) 33,472 A British thermal unit is a) the amount of heat needed to raise one pound of water one degree F b) the amount of heat needed to raise one pound of steam one degree F c) a unit of temperature measurement. d) the amount of heat in water between freezing and boiling. - CORRECT ANSWERS-a) the amount of heat needed to raise one pound of water one degree F Hydronic heat is a) steam heat b) hot water heat c) radiant heat d) heat of evaporation - CORRECT ANSWERS-b) hot water heat Superheated steam is a) reheated steam b) very hot steam c) flash steam d) saturated steam - CORRECT ANSWERS-a) reheated steam 2,545 Btu represents a) 1 bhp b) 1 kilowatt-hour c) 1 horsepower-hour d) 1 therm - CORRECT ANSWERS-c) 1 horsepower-hour A throttling calorimeter is used to measure the quality of a) dry steam b) saturated steam c) superheated steam d) Btu in coal - CORRECT ANSWERS-b) saturated steam The amount of heat in one pound of saturated steam is approximately equal to a) 970.3 Btu b) 1,150 Btu c) 3,412 Btu d) 100,000 Btu - CORRECT ANSWERS-b) 1,150 Btu A boiler operating at 100 PSI has a dry saturated steam temperature of 338 degrees F. What is the boilers water temperature? a) 180 degrees F b) 212 degrees F c) 309 degrees F d) 338 degrees F - CORRECT ANSWERS-d) 338 degrees F A dry pipe is used to a) separate moisture from steam as it leaves the drum. b) separate moisture from steam as it leaves the superheater. c) separate moisture from steam at the turbine throttle. d) increase superheater temperature. - CORRECT ANSWERS-a) separate moisture from steam as it leaves the drum The purpose of a staybolt is to a) support the shell of the boiler. b) reinforce the heads of a fire-tube boiler. c) help make a water-tube boiler safer to operate. d) strengthen and support flat plates of a fire-tube boiler. - CORRECT ANSWERS-d) strengthen and support flat plates of a fire-tube boiler The boiler vent valve is located on the a) top of the steam drum. b) bottom of the steam drum. c) top of the mud drum. d) top of the water drum. - CORRECT ANSWERS-a) top of the steam drum The purpose of the hole in the end of the staybolt is to a) indicate how much water is in the boiler. b) indicate that a staybolt is cracked or broken. c) help the boiler operator operate more efficiently. d) provide means of attaching insulation to a boiler. - CORRECT ANSWERS-b) indicate that a staybolt is cracked or broken A fusible plug melts at a) 212 degrees F b) 450 degrees F c) 1,000 degrees F d) none of the above - CORRECT ANSWERS-b) 450 degrees F As the firing rate increases in a boiler equipped with a convection superheater, the steam temperature a) increases b) decreases c) stays constant d) both increases and decreases - CORRECT ANSWERS-a) increases When boilers are connected to a common header, it is required that an ample free blowing drain be provided between the stop valves if either or both boilers have a) handholes b) manholes c) over 10 tubes or flues d) more than one safety valve - CORRECT ANSWERS-b) manholes It is permissable to have only one bottom blowdown valve on a boiler when the a) MAWP does not exceed 100 PSI b) MAWP exceeds 125 PSI c) heating surface does not exceed 100 ft^2 d) heating surface does not exceed 500 ft^2 - CORRECT ANSWERS-a) MAWP does not exceed 1