2Nd Class Fireman, High Pressure Boilers, Chapter 11, Exam

Front 1

The amount of pressure can be expressed in units of _____

Back 1

Pounds per square inch (psi), inches of water column (in. WC), inches of Mercury (in. Hg)

Front 2

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) _____

Back 2

Inch of water column

Front 3

A _____ thermometer uses a strip of two metal alloys with different coefficients of thermal expansion that are fused together at the ends

Back 3

Bimetallic

Front 4

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

Back 4

Displacer

Front 5

A(n) _____ flow meter measures the pressure drop across a pipeline flow restriction, which varies with changes in the flow rate

Back 5

Differential-pressure

Front 6

A _____ measures the electrical conductivity of liquids and consists of two electrodes immersed in a solution

Back 6

Conductivity meter

Front 7

A(n) _____ analyzer is used to measure the excess oxygen content

Back 7

Zirconium Oxide

Front 8

A(n) _____ is an audible alarm that is created electrically or electronically

Back 8

Annunciator

Front 9

A(n) _____ provides the power and motion needed to manipulate the moving parts of a valve or damper

Back 9

Actuator

Front 10

A(n) _____ device is a human-machine interface used to control the actions of a system or computer

Back 10

Programming

Front 11

Pressure gauges can be calibrated in pounds per _____

Back 11

Square inch

Front 12

When one end of a thermocouple is heated, a small _____ is produced

Back 12

Voltage

Front 13

A steam pressure gauge should have a range of _____

Back 13

1.5 to 2 times the safety valve setting

Front 14

A bubbler may also be called a(n) ____

Back 14

Pneumercator

Front 15

A steam pressure gauge must be protected from live steam by _____

Back 15

A siphon

Front 16

Thermocouples measure _____

Back 16

Temperature

Front 17

A temperature reading of ____ can be made with a thermocouple

Back 17

Superheated steam, gases of combustion, condensate return

Front 18

Flow meters measure the rate of flow of _____

Back 18

A variety of fluids

Front 19

A variable-area flow meter maintains a constant _____ and allows the flow area to change with the flow rate

Back 19

Differential pressure

Front 20

A _____ is used to measure the difference in draft pressure between the atmosphere and the furnace, breeching, or stack

Back 20

Draft gauge

Front 21

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

Back 21

Thermocouple

Front 22

Absolute pressure is equal to _____

Back 22

Gauge pressure plus atmospheric pressure

Front 23

A float is a level measuring instrument with a _____ attached to it that floats on top of a liquid in a tank

Back 23

Hollow ball

Front 24

A boiler steam pressure gauge should be connected to the ____ side of the boiler

Back 24

Highest part of the water

Front 25

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

Back 25

Venturi tube

Front 26

When pressure is less than atmospheric pressure, it is called ___.

Back 26

Vacuum.

Front 27

A steam pressure gauge must be protected by a ___.

Back 27

Pigtail siphon.

Front 28

A ___ is a draft gauge that measures pressure with a liquid-filled tube.

Back 28

Manometer.

Front 29

___ are typically calibrated to read inches of mercury from 0′′ Hg to 30′′ Hg.

Back 29

Vacuum gauges.

Front 30

High-temperature thermometers called ___ can be used to measure furnace temperatures in the range of 100°F to 2500°F.

Back 30

Pyrometers.

Front 31

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.

Back 31

Thermocouple.

Front 32

Liquid-in-glass thermometers are typically filled with a(n) ___.

Back 32

Colored alcohol solution.

Front 33

Tubular gauge glasses are used in boilers that operate at up to ___ psi.

Back 33

300.

Front 34

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.

Back 34

Conductivity probe.

Front 35

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.

Back 35

Displacer.

Front 36

A guided-wave radar is only affected by ___.

Back 36

Materials that reflect energy.

Front 37

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.

Back 37

Orifice plate.

Front 38

A ___ flow meter is a meter that measures the mass flow rate of a fluid.

Back 38

Coriolis.

Front 39

Conductivity meters are used to monitor the ___ in water.

Back 39

Total dissolved solids.

Front 40

A pH level of ___ indicates alkaline water.

Back 40

10.

Front 41

An excessive level of carbon monoxide indicates ___.

Back 41

Insufficient secondary air.

Front 42

___ control loops control the boiler water level or the fluid levels within tanks.

Back 42

Level.

Front 43

A(n) ___ is a self-operating control valve used for pressure and temperature control.

Back 43

Regulator.

Front 44

Dampers are normally constructed from ___ that is treated to resist corrosion and rust.

Back 44

Welded steel.

Front 45

Indicators are typically ___, but they could be simple lights.

Back 45

Gauges.

Front 46

A(n) ___ is an audible alarm that is created electrically or electronically.

Back 46

Annunciator.

Front 47

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.

Back 47

Transducer.

Front 48

* What is perfect vacuum at?

Back 48

0 psig or 29.95” Hg.

Front 49

What psi are tubular gauge glasses good to?

Back 49

300 psi.