High Pressure Boilers questions with correct answers

In conduction the heat transfers through? CORRECT ANSWER-Contact The Transfer of heat from a fluid flowing over the surface of a body? CORRECT ANSWER-Convection The flow of heat through electromagnetic waves is? CORRECT ANSWER-Radiation A power steam boiler operates at... CORRECT ANSWER-greater than 15 psi steam, or hotwater at 160 psi, or 250 F° What is a super critical boiler? CORRECT ANSWER-One that operates in excess of 3206 psia or 705.4 degrees F° A boiler HP is... CORRECT ANSWER-the evaporation of dry saturated steam at 34.5 lbs/hr from and at 212 F° How many BTU's/hr is equal to one boiler HP? CORRECT ANSWER-33,475 The max voltage on a control circuit is? CORRECT ANSWER-150 volts A pressure relief valve on a HW boiler must be? CORRECT ANSWER-at least 3/4 inch diameter but not more than 4 1/2 in.