Stationary Engineering Test Exam Questions And Answers 100% Solved

Stationary Engineering Test Exam Questions And Answers 100% Solved When designing a boiler, special consideration must be given to heat transmission - answerRadiation, conduction, and convection Which type of heat transfer takes place by actual physical contact, from molecule to molecule, without displacing the molecules? - answerConduction Which type of boiler is the most economical to build? - answerFiretube A boiler is an industrial boiler when - answerThe steam generated is used for a process Which is true about an industrial boiler as compared to a utility boiler? - answerIdustrial boilers operate at lower pressures and temperatures Utility boilers are used primarily to produce - answerHigh pressure steam to drive turbines that make electricity Which of the following is NOT a type of fire tube boiler? - answerStirling Which of the following is an example of a cogeneration system? - answerExhaust gases from a combustion turbine driven generator are used to make steam in a boiler for a secondary purpose If the tubes in a boiler are expanded during installation, which of the following will be true? - answerThe ID is increased When a new tube is installed in a firetube boiler, which of the following happens to the tube? - answerThe tube is lengthened What is the MINIMUM size of an elliptical manhole on a boiler? - answer11" x 15" What is the MINIMUM water temperature to be used for a hydrostatic test? - answer70 degrees F How many sq ft of heating surface are required to produce 1 horsepower in a HRT firetube boiler? - answer12 sq ft How many sq ft of heating surface are required to produce 1 horsepower in a vertical firetube boiler? - answer14 sq ft How many sq ft of heating surface are required to produce 1 horsepower in a watertube boiler? - answer10 sq ft If a high pressure boiler is at its highest operating pressure below the MAWP, where will the pointer on the pressure gauge be? - answerat 12ʻ o clock A gauge that reads higher than the actual boiler pressure is called a - answerFast gauge Which is true about a boiler pressure mercury switch? - answerMercury switch must be installed with pigtail siphon vertically On a low pressure boiler, cut out equals - answercut in plus differential What is the MAXIMUM blowback on a safety relief valve that is set for 100 psig - answer4 psig If a high pressure boiler operates at 100 psig, what should be the blowback of the safety valve? - answernot more than 4% and not less then 2psi in any case What is the MINIMUM blowback on a safety valve that pops at 250 psi. - answer5 psi A data plate on a safety valve on a low pressure boiler is marked "6900 Ib". This refers to: - answerlb/hr capacity of the safety valve When an accumulation test is performed, the boiler is fired at: - answermaximum firing rate with main steam stop valve closed You have a safety valve set on a 50 psi boiler system. What is the maximum pressure that may be developed during safety valve blowdown? - answer53 psi Oils and solids accumulating on the water surface in the boiler can lead to what condition? - answerFoaming If the water in a boiler is foaming, the water level indication in the gauge glass will be - answererratic If you have a priming condition, the sight glass will read - answerhigh A boiler has carried a large slug of water over into the steam. This condition is called - answerpriming How do steam separators work? - answerthey cause a sudden change in direction that throws water out On a pressure gauge, what is the minimum size piping that can be used? - answer1/4" if copper or brass pipe 1/2" if steel Which statement is true about steel pipe when used on a boiler? - answerMay not be less than 1/2" When may copper tubing NOT be used for steam service? - answerwhen the temp exceeds 406 degrees/250psi Cast iron or ductile iron pipe is used for - answerunderground water supply and drainage For every 100 feet of steam header piping, you lose how much pressure? - answer2-3 psi What is the allowable pressure drop in a 100 psi steam line? - answer2-3 psi What common type of expansion joint is used universally throughout a steam distribution system? - answerU-bend A difference between a check valve and a non-return valve is: - answerA non return valve acts as a cushioning valve that helps prevent chattering In a low pressure heating system. which type of steam trap is most commonly used? - answerA thermostatic steam trap Which type of steam trap contains a piston and a valve? - answeran impulse trap How much of an efficiency gain will be produced by each 10 degree F. temperature rise in a superheater? - answer1% Which statement is true about operation of a boiler with a superheater? - answerfor maximum economy, a constant superheat temperature is desirable A superheater safety valve relieves how much of the total steam produced by a boiler? - answer20% How much steam flow. at a minimum, should be maintained through the superheater? - answer20% of the boiler capacity What is the purpose of a water screen? - answerto prevent slagging What is required if the boiler pressure is greater than or equal to 400 psig.? - answer2 direct mechanical gauge glasses or one gauge glass and two remote indicators Which statement about valves connected to a water column is FALSE? - answerThe valves may be removed while the boiler is in operation