Mn Boiler License Exam Questions And Detailed Answers

what is the minimum size of the pipes connecting the boiler to the water column? a) 3/4 inch b) 1 inch c) 1/2 inch {Ans: a) 3/4 inch}what is the purpose of the low limit control on a hot water boiler? a) a low limit control is not used on a hot water boiler b) this control will not allow the burner to leave low fire position until the temperature of the water in the boiler reaches 150 degrees Fahrenheit c a low limit control will reduce pressure on the hot water system d) a low limit control will it reduce pressure on the recirculating pump {Ans: b) this control will not allow the burner to leave low fire position until the temperature of the water in the boiler reaches 150 degrees Fahrenheit}A chief class operating license is required to take charge of a boiler plant over what horsepower? a) 50 bhp b) 500 bhp c) 300 bhp {Ans: c) 300 bhp must be in attendance 4 hrs a day for 5 days a week except for sick and vacation time or holidays.}on a low pressure boiler, over what sq ft require 2 safety valves? a) 100