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49 Cards in this Set
- Front
- Back
The amount of pressure can be expressed in units of _____ |
Pounds per square inch (psi), inches of water column (in. WC), inches of Mercury (in. Hg) |
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A draft gauge is used to measure the difference in draft pressure between the atmosphere and the furnace, breeching, or stack and is calibrated in tenths of a(n) _____ |
Inch of water column |
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A _____ thermometer uses a strip of two metal alloys with different coefficients of thermal expansion that are fused together at the ends |
Bimetallic |
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A(n) _____ is an instrument consisting of a cylinder, heavier than the liquid in which it is immersed, and a torsion device that measures its weight |
Displacer |
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A(n) _____ flow meter measures the pressure drop across a pipeline flow restriction, which varies with changes in the flow rate |
Differential-pressure |
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A _____ measures the electrical conductivity of liquids and consists of two electrodes immersed in a solution |
Conductivity meter |
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A(n) _____ analyzer is used to measure the excess oxygen content |
Zirconium Oxide |
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A(n) _____ is an audible alarm that is created electrically or electronically |
Annunciator |
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A(n) _____ provides the power and motion needed to manipulate the moving parts of a valve or damper |
Actuator |
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A(n) _____ device is a human-machine interface used to control the actions of a system or computer |
Programming |
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Pressure gauges can be calibrated in pounds per _____ |
Square inch |
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When one end of a thermocouple is heated, a small _____ is produced |
Voltage |
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A steam pressure gauge should have a range of _____ |
1.5 to 2 times the safety valve setting |
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A bubbler may also be called a(n) ____ |
Pneumercator |
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A steam pressure gauge must be protected from live steam by _____ |
A siphon |
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Thermocouples measure _____ |
Temperature |
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A temperature reading of ____ can be made with a thermocouple |
Superheated steam, gases of combustion, condensate return |
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Flow meters measure the rate of flow of _____ |
A variety of fluids |
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A variable-area flow meter maintains a constant _____ and allows the flow area to change with the flow rate |
Differential pressure |
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A _____ is used to measure the difference in draft pressure between the atmosphere and the furnace, breeching, or stack |
Draft gauge |
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A _____ consists of two dissimilar metals that are joined together to form a circuit that generates a voltage proportional to the difference in temperature between the hot and cold ends of the wires |
Thermocouple |
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Absolute pressure is equal to _____ |
Gauge pressure plus atmospheric pressure |
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A float is a level measuring instrument with a _____ attached to it that floats on top of a liquid in a tank |
Hollow ball |
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A boiler steam pressure gauge should be connected to the ____ side of the boiler |
Highest part of the water |
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A(n) _____ is a flow restriction device consisting of a fabricated pipe section with a converging inlet section, a straight throat, and a diverging outlet section |
Venturi tube |
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When pressure is less than atmospheric pressure, it is called ___. |
Vacuum. |
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A steam pressure gauge must be protected by a ___. |
Pigtail siphon. |
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A ___ is a draft gauge that measures pressure with a liquid-filled tube. |
Manometer. |
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___ are typically calibrated to read inches of mercury from 0′′ Hg to 30′′ Hg. |
Vacuum gauges. |
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High-temperature thermometers called ___ can be used to measure furnace temperatures in the range of 100°F to 2500°F. |
Pyrometers. |
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A ___ is a thermometer consisting of two dissimilar metals that are joined together to form a circuit that generates a voltage proportional to the difference in temperature between the hot and cold ends of the wires. |
Thermocouple. |
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Liquid-in-glass thermometers are typically filled with a(n) ___. |
Colored alcohol solution. |
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Tubular gauge glasses are used in boilers that operate at up to ___ psi. |
300. |
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A ___ is a water level indicator that senses the boiler water level by detecting a change in current flow as water covers or uncovers the end of the probe. |
Conductivity probe. |
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A(n) ___ is a level-measuring instrument consisting of a cylinder, heavier than the liquid in which it is immersed, connected to a spring or torsion device that measures its weight. |
Displacer. |
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A guided-wave radar is only affected by ___. |
Materials that reflect energy. |
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A(n) ___ is a flow restriction device consisting of a thin circular metal plate with a sharp-edged hole in it and a tab that protrudes from a flange. |
Orifice plate. |
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A ___ flow meter is a meter that measures the mass flow rate of a fluid. |
Coriolis. |
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Conductivity meters are used to monitor the ___ in water. |
Total dissolved solids. |
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A pH level of ___ indicates alkaline water. |
10. |
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An excessive level of carbon monoxide indicates ___. |
Insufficient secondary air. |
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___ control loops control the boiler water level or the fluid levels within tanks. |
Level. |
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A(n) ___ is a self-operating control valve used for pressure and temperature control. |
Regulator. |
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Dampers are normally constructed from ___ that is treated to resist corrosion and rust. |
Welded steel. |
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Indicators are typically ___, but they could be simple lights. |
Gauges. |
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A(n) ___ is an audible alarm that is created electrically or electronically. |
Annunciator. |
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A(n) ___ is a device that receives a signal representing a variable, such as temperature, pressure, or flow, and converts that signal into an electrical or digital signal that is compatible with a digital control system. |
Transducer. |
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* What is perfect vacuum at? |
0 psig or 29.95” Hg. |
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What psi are tubular gauge glasses good to? |
300 psi. |