MA 2nd Class Fireman's Practice Exam 2023| 106 All Questions and Correct Detailed Answers

1 At 0 PSIG, how many BTU are necessary to change 1 lb of water at 212 degrees Fahrenheit into team? a) 144 b) 180 c) 970 d) 1,190 - ANSWER 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. - ANSWER 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. - ANSWER 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. - ANSWER 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 - ANSWER 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 - ANSWER 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 - ANSWER b) latent heat Heat may be transferred in how many ways? a) One b) Two c) Three d) Four - ANSWER 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. - ANSWER 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 - ANSWER c) 150 What does 212 degrees F equal on the Celsius scale? a) 32 b) 100 c) 180 d) 970.3 - ANSWER b) 100