DC THIRD CLASS STATIONARY BOILER EXAM 2025 COMPLETE EXAM QUESTIONS AND VERIFIED ANSWERS |RECENTLY TESTING REAL EXAM QUESTIONS| 100% SOLVED!!

DC THIRD CLASS STATIONARY
BOILER EXAM 2025 COMPLETE
EXAM QUESTIONS AND VERIFIED
ANSWERS |RECENTLY TESTING
REAL EXAM QUESTIONS| 100%
SOLVED!!
What is the thermal efficiency percentage of boiler with a stack temperature of 60
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0 F and furnace temperature of 2800 F ? - ANSWERS-78.5
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What is the proper order of zeolite rejuvenation water softener . - ANSWERS-
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Back Wash, Brine, Rinse , and Service
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given the three phase 480-
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volt motor has a current draw of 42amps and a power factor rating of 90% -
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ANSWERS-181
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a four-wire wye-connected system with a phase-to-
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phase voltage of 208 volt has a volta has a phase to neutral voltage of 120 volts -
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ANSWERS-120 volts
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steam (High Velocity) what kind of energy ? - ANSWERS-Mechanical
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Which of the following statement is not ture concerning a superheat ? -
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ANSWERS-Super Heater (BTU)
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The ______ pump supplies the water to the condenser to condense the steam. -
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ANSWERS-Condensate
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What is the first thing that happen for a three-
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element regulator to change the output of the controller? - ANSWERS-
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Condensate Flow Increases nb nb




The primary reason for using wet scrubbers is to ? - ANSWERS-
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Remove flue gas particulates
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What is used on the outer rim of the blades or nozzles to stiffen the blade against
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vibration and confine the steam to the ________ ? - ANSWERS-Shroud Ring
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The refrigerant in a condenser to usually sub cooled between _________ degree
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F below the condensing temperature? - ANSWERS-.7 to 9 degrees
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, if you are operation a boiler with a three-
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element feed water regulator, when is being measured and recorded by mechanic
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ally operated water ? - ANSWERS-Steam Flow, Feedwater and drum level
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given thermocouples have both a hot junction and a cold junction. the cold junctio
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n measured the ____________ point ? - ANSWERS-Reference
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A water heating system that uses the same pipe for supply and return is called a
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__________ system - ANSWERS-One pipe nb nb nb nb




a malfunction in the deaerate feed water tank is indicated by ? - ANSWERS-
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Boiler requiring excessive amount of oxygen scavenge chemicals.
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what uses the theory of centirifical force that applies to the roating element of turbi
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ne and controls the speed of the turbine? - ANSWERS-Speed Governor
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which of the following is not purpose of an air cock on a steam drum ? -
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ANSWERS-to let the air escape while filing the drum
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which of the following types of boiler is more suited for pressure exceeding 350 ps
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i? - ANSWERS-Scotch Marine
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An automatic control valve commonly used to maintain feed water level in a boiler
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whose internal design is constructed with 2 valve and ? - ANSWERS-
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balancing valve nb




what are the 2 chief heat producing elements? - ANSWERS-carbon and hydrogen
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copper testing is used to detect ? - ANSWERS-heat exchanger and pump water
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and on and off type control system is usually found on what type of boiler? -
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ANSWERS-package fire tube boiler
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the chemical used to perform water treatment test are called? - ANSWERS-
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reagents

on turbine, what is between every set to rotating blades - ANSWERS-
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stationary blades nb




the color of R-404A refrigerant is ? - ANSWERS-Orange
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what is used when a large load must be carried to maintain the proper exit positio
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n of turbine shaft? - ANSWERS-thrust bearing
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given a pressure drop calculates flow measurement across an orifice two widely u
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sed secondary element which connects differential pressure to a usable output sig
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nal? - ANSWERS-transmitter and receiver
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in what year was the first clen air act regulation passes ? - ANSWERS-1963
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