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EPA Section 608 Technician Certification Study Guide With 100- Correct Answers.
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EPA Section 608 Technician Certification Study Guide With 100- Correct Answers.
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EPA Section 608 Technician CertificationStudy Guide With 100% Correct Answers
What .are .the .typical .uses .of .the .center .port .of .gauge .set? .- .(correct .answer) .-
Used .during .evacuation, .charging .and .recovery .procedures.
What .color .are .the .gauges .on .a .manifold .gauge .set? .- .(correct .answer) .-
Low .pressure .is .blue, .High .pressure .is .red.
What .are .the .typical .ranges .of .pressure .measurements .used .on .the .gauges .of .a .manifold .gauge .set
? .- .(correct .answer) .-
High .side .is .0 .to .500 .PSIG; .Low .side .is .0 .to .350 .PSIG .and .0 .to .30 .in. .Hg .below .atmospheric .pressur
e.
Is .the .refrigerant .leaving .a .condenser .at .a .high .or .low .pressure? .Is .it .a .liquid .or .a .gas? .- .
(correct .answer) .-High .pressure, .liquid.
Is .the .refrigerant .entering .the .expansion .valve .(variable .metering .device) .a .liquid .or .gas? .- .
(correct .answer) .-Liquid, .high .pressure.
Is .the .pressure .of .the .refrigerant .entering .the .compressor .high .or .low? .- .(correct .answer) .-
Low .pressure .vapor.
Where .in .a .refrigerant .circuit .does .a .liquid .boil .to .absorb .heat? .- .(correct .answer) .-
In .the .evaporator.
The .refrigerant .in .the .suction .line .is .a .gas .that .has .been .heated .above .its .saturation. .What .is .this .c
ondition .called? .- .(correct .answer) .-Superheated .vapor.
What .can .cause .liquid .refrigerant .to .migrate .to .a .compressor .crankcase? .- .(correct .answer) .-
If .the .compressor .is .located .in .the .coldest .location .in .the .circuit.
List .two .conditions .that .can .quickly .damage .a .compressor .that .is .starting .to .run? .- .
(correct .answer) .-Operating .while .in .a .deep .vacuum .or .when .the .service .valves .are .closed.
,What .system .failures .require .taking .an .oil .sample? .- .(correct .answer) .-
A .compressor .burnout .or .if .the .unit .has .had .a .leak.
Is .flushing .with .refrigerant .an .acceptable .tube .cleaning .method? .- .(correct .answer) .-No.
In .addition .to .preventing .and .repairing .leaks .what .else .should .a .technician .do .to .conserve .refrigera
nt? .- .(correct .answer) .-Recover .and .recycle .used .refrigerants.
What .factors .affect .the .speed .of .an .evacuation? .- .(correct .answer) .-
Pump .size, .hose .length, .hose .diameter, .size .of .system .to .be .evacuated, .ambient .temperature, .suctio
n .line .size, .and .the .amount .of .moisture .in .the .system.
How .should .gauge .set .hoses .be .sized .for .use .in .evacuating .a .system? .- .(correct .answer) .-
Use .the .shortest .length .and .the .largest .diameter .possible .for .the .quickest .evacuation. .At .least .as .lar
ge .as .the .vacuum .pump .inlet.
When .evacuating .what .is .the .benefit .of .using .short .hoses .with .large .diameters? .- .(correct .answer) .-
Reduces .emissions, .pressure .drop .and .evacuation .time.
Which .connection .determines .the .preferred .size .of .hoses .used .with .a .vacuum .pump? .- .
(correct .answer) .-The .vacuum .pump .inlet.
As .the .capacity .and .suction .hose .size .increase .what .happens .to .the .time .needed .for .an .evacuation?
.- .(correct .answer) .-Time .is .reduced.
What .purpose .is .served .by .heating .a .system .during .dehydration? .- .(correct .answer) .-
To .speed .up .moisture .removal.
Does .a .thorough .evacuation .remove .moisture .from .a .system? .- .(correct .answer) .-Yes.
What .can .happen .to .oil .in .the .compressor .if .the .moisture .is .left .in .an .operating .system? .- .
(correct .answer) .-
The .oil .will .form .hydrofluoric .and .hydrochloric .acids .which .will .corrode .the .internal .parts .of .the .syst
em.
What .is .the .result .of .over-evacuating .a .system? .- .(correct .answer) .-No .damage .will .be .done.
How .can .a .system .be .leak .checked .using .a .low .pressure .gauge? .- .(correct .answer) .-
Vacuum .reading .will .rise .when .vacuum .pump .is .turned .off.
How .close .should .the .vacuum .gauge .be .connected .to .the .vacuum .pump .during .evacuation? .- .
(correct .answer) .-As .far .away .as .possible.
When .measuring .the .vacuum .of .a .system .being .evacuated .the .system .must .be .isolated. .What .must
.be .done .to .the .vacuum .pump? .- .(correct .answer) .-Turn .it .off .and .valve .it .off.
, What .is .ozone? .- .(correct .answer) .-
3 .atoms .of .oxygen. .It .blocks .much .of .the .harmful .ultraviolet .radiation .(uv-
b) .emitted .from .the .sun .and .it .keeps .our .earth's .temperature .stable.
How .much .ozone .can .a .chlorine .atom .destroy .in .the .stratosphere? .- .(correct .answer) .-
One .atom .can .destroy .100,000 .ozone .molecules.
What .is .Ozone .Depletion .Potential .(ODP)? .- .(correct .answer) .-
The .ability .of .any .chemical .to .deplete .the .ozone .layer.
What .is .CFC? .- .(correct .answer) .-Chlorofluorocarbon.
Which .refrigerants .are .CFC's? .- .(correct .answer) .-R-11,12,113,114.
Which .chemical .in .the .CFC .refrigerants .does .the .most .damage .to .the .ozone .layer? .- .
(correct .answer) .-Chlorine.
What .is .an .HCFC? .- .(correct .answer) .-Hydrochlorofluorocarbons.
Which .refrigerants .are .HCFC's? .- .(correct .answer) .-R-22,123.
Which .is .more .harmful .to .the .ozone .layer .a .CFC .or .an .HCFC? .- .(correct .answer) .-CFC's.
What .is .it .about .CFC's .that .make .them .more .harmful .to .the .stratosphere? .- .(correct .answer) .-
Chemical .strength, .they .will .not .breakdown .in .the .lower .atmosphere.
What .is .an .HFC? .- .(correct .answer) .-A .fluorocarbon .that .contains .no .chlorine.
Which .refrigerants .are .HFC's? .- .(correct .answer) .-R-134a,404a,407c,410a.
What .is .the .ODP .of .the .HFC .refrigerant? .- .(correct .answer) .-Zero.
Which .refrigerants .contain .chlorine? .- .(correct .answer) .-CFC's .and .HCFC's.
Which .refrigerants .have .high .ODP? .- .(correct .answer) .-CFC's.
Which .refrigerants .have .low .ODP? .- .(correct .answer) .-HCFC's, .HFC's .are .zero.
What .is .an .azeotrope .refrigerant? .- .(correct .answer) .-
A .mixture .of .two .or .more .compounds .where .the .mixture .behaves .like .a .single .chemical.
Is .one .of .the .components .of .R-500 .a .CFC? .- .(correct .answer) .-Yes
Does .stratospheric .ozone .help .or .hurt .the .work .of .the .earth's .protective .shield? .- .(correct .answer) .-
It .helps.
What .chemical .in .the .stratosphere .tells .us .ozone .depletion .is .occurring? .- .(correct .answer) .-
Chlorine-monoxide.
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