Grade 4 Stationary Engineer License Practice questions with correct answers

what is a boiler CORRECT ANSWER a closed metal container (pressure vessel) which water is heated to produce steam or heated water what is steam CORRECT ANSWER the vapor that forms when water is heated to its boiling point when did the greatest impact of the use of steam power occur CORRECT ANSWER during the industrial revolution 18th and early 19th century who invented the steam engine and when CORRECT ANSWER James Watt of Scotland in 1736 How is steam produced CORRECT ANSWER water is heated to 212 degrees at atmospheric pressure state the first law of thermodynamics CORRECT ANSWER energy cannot be created or destroyed but may be changed from one form to another state the second law of thermodynamics CORRECT ANSWER heat always flows from a material at a high temperature to a material at a low temperature what is sensible heat CORRECT ANSWER heat that causes a temperature change that can be measured with a thermometer or sensed by a person what is latent heat CORRECT ANSWER head identified by a change of state and no temperature change what is a BTU CORRECT ANSWER the amount of energy required to raise the temperature of 1 lb. of water 1 degree Fahrenheit