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Class 4 Boiler Tests | Boiler Operator Exam Practice Questions & Study Guide

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Prepare for your Class 4 Boiler Operator exam with this focused collection of practice tests and study material. Use it to review important boiler concepts, test your knowledge, and identify areas that need additional revision. What’s included: Class 4 boiler test questions Boiler operator exam practice Key boiler operation concepts Safety and operating principles Technical terminology and review topics Practice questions for self-assessment Exam-focused revision material Ideal for: Class 4 boiler operator students Boiler operator exam preparation Practice testing and self-assessment Technical revision Reviewing key concepts before the exam Practice, review, and strengthen your knowledge to approach your Class 4 Boiler Operator exam with greater confidence.

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Class 4 Boiler Tests
./ ./ ./




_______________are./the./most./important./valves./on./the./boiler./-
./correct./answer✔ ✔ Safety./Valves



highest./part./of./the./steam./side./of./the./boiler../-./correct./answer✔ ✔
Safety./valves./are./located./on./the


Only./spring-loaded./pop./type./valves./are./allowed./for./a./________./-
./correct./answer✔ ✔ safety./valve


ASME./code./requires./at./least__________safety./valve./on./every./boiler../-
./correct./answer✔ ✔ one


Boilers./with./more./than______./of./heating./surface./shall./have./two./or./more./
safety./valves./-./correct./answer✔ ✔ 500./SQ./FT


Safety./valves./over./3"./in./diameter./for./pressures./over./15./PSI./shall./have./a./-
./correct./answer✔ ✔ flanged./or./weld-end./inlet.

,_______________must./direct./proper./discharge./of./steam./away./from./oper
ator./and./not./put./strain./on./safety./valve./-./correct./answer✔ ✔
Safety./valve./piping


used./to./express./the./electrical./pressure./differential./between./two./points./of./
a./conductor./i.e../water./pressure./required./to./make./water./flow./in./a./pipe../-
./correct./answer✔ ✔ Volt


used./to./express./the./number./of./electrons./flowing./through./a./conductor./per./
unit./of./time./i.e../flow./of./water./measured./through./a./pipe./measured./in./gallo
ns./per./minute../-./correct./answer✔ ✔ Ampere


basic./unit./of./electrical./power../Watts=./volts./X./amperage./-./correct./answer
✔ ✔ Watt


used./to./express./resistance./to./the./flow./of./electrons./in./a./conductor./i.e../fricti
on./that./occurs./in./pipes./as./water./flows./through../-./correct./answer✔ ✔
Ohm


electrons./flowing./only./one./way./in./a./circuit../They./have./a./positive./and./neg
ative./terminal../Best./example./is./a./battery./or./photocell../-./correct./answer✔
✔ D.C.-direct./current

,electron./flow./that./reverses./its./direction./at./regular./intervals./of./time../-
./correct./answer✔ ✔ A.C.-./alternating./current


______is./either./single./phase./or./three-
phrase./and./is./commonly./found./in./building./wiring../-./correct./answer✔
✔ A.C.-alternating./current


material./that./promotes./free./flow./of./electrons./such./as./copper./or./aluminum
../-./correct./answer✔ ✔ Electrical./conductor


material./that./does./not./allow./free./flow./of./electrons./such./as./wood./or./rubbe
r../-./correct./answer✔ ✔ Electrical./insulator


____________must./be./mounted./directly./to./the./boiler./or./water./column../-
./correct./answer✔ ✔
Glass./gauges../Tubular./gauges./are./used./up./to./250./PSI./and./flat./gauges./fo
r./pressures./over./250./PSI.


Glass./gauge./is./located./at./the./______./so./the./gauge./glass./is./_______./above
./the./highest./heating./surface./on./a./fire./tube./boiler../-./correct./answer✔ ✔
A)./NOWL./B)./2-3"

, The./_____________must./be./located./so./the./lowest./part./of./the./gauge./glass.
/is./3"./above./the./lowest./safe./operating./water./level../-./correct./answer✔ ✔
water./column


Pressures./over./__________./require./two./separate./means./of./checking./wate
r./level,./either./two./direct-
reading./water./gauges./or./two./remote./views./with./one./direct-
reading./gauge../-./correct./answer✔ ✔ 400./PSI



To./maintain,./clean./and./test./a./gauge./glass:./-./correct./answer✔ ✔
1)Close./steam./and./water./valves./on./water./column./or./gauge./glass../2)Ope
n./drain./valve./fully,./drain./and./then./crack./steam./valve./and./allow./gentle./rus
h./of./steam./to./pass./through./water./column./or./gauge./glass./(>20./sec.)./3)Clos
e./steam./valve,./inspect./and./repeat./until./clean../4)Close./blow./down./valve./a
nd./simultaneously./open./steam./and./water./valves,./slowly./bringing./back./to./
normal./operating./level.


If./_____________./top./line./is./clogged./or./closed./glass./will./show./as./full../-
./correct./answer✔ ✔
glass./gauge./If./bottom./line./is./clogged./or./closed./water./will./show./as./stati
onary./and./slowly./fill./up./due./to./steam./condensation.


Glass./gauges./should./be./blown./down./and./tested./at./least./_________and./pr
eferably./each./________change../-./correct./answer✔ ✔
A)./once./a./day./B)./shift

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