KY HVAC JOURNEYMAN 2026 EXAM AND PREP TEST EXAM
150 QUESTIONS AND CORRECT DETAILED ANSWERS TOP
RATED VERSION FOR ALREADY A+ GRADED WITH EXPERT
VERIFIED SOLUTIONS
1. Defects ||on ||gas ||piping ||or ||fittings ||shall ||be:
(A) repaired
(B) replaced ||or ||repaired ||and ||retested
(C) repaired ||by ||a ||certified ||welder
(D) ignored, ||as ||the ||operating ||pressure ||is ||much ||less ||than ||the ||air ||test
Answer: ||B
Rationale: ||All ||gas ||piping ||or ||fitting ||defects ||must ||be ||replaced ||or ||repaired ||and ||retested ||to ||ensure
||safety. ||(UMC ||Section ||1316.4.3)
2. Every ||absorption ||refrigerating ||system ||supported ||from ||the ||ground ||shall ||rest ||on ||a
||concrete ||slab ||extending ||not ||less ||than:
(A) 3 ||inches ||below
(B) 3 ||inches ||above
(C) 6 ||inches ||below
(D) 6 ||inches ||above
Answer: ||B
Rationale: ||The ||slab ||must ||be ||3 ||inches ||above ||the ||adjoining ||ground ||level ||to ||prevent ||moisture
||contact. ||(UMC ||Section ||1106.2)
3. Any ||part ||of ||a ||venting ||system ||installed ||at ||an ||angle ||greater ||than ||45 ||degrees ||from ||the
||vertical ||is ||considered:
(A) vertical
(B) horizontal
(C) a ||flat ||vent
(D) an ||offset ||vent
Answer: ||B
Rationale: ||Angles ||greater ||than ||45 ||degrees ||are ||treated ||as ||horizontal ||for ||venting ||calculations.
||(UMC ||Section ||802.6.1.1)
4. Listed ||transition ||ducts ||for ||clothes ||dryers ||shall ||not ||exceed:
(A) 3 ||ft
,(B) 4 ||ft
(C) 5 ||ft
(D) 6 ||ft
Answer: ||D
Rationale: ||Maximum ||length ||of ||transition ||ducts ||for ||dryers ||is ||6 ||feet ||to ||ensure ||proper ||airflow.
||(UMC ||Section ||504.3.2.1)
5. Industrial ||product-conveying ||ducts ||and ||their ||fittings ||for ||abrasive ||and ||nonabrasive ||dust
||or ||solid ||materials ||shall ||be ||constructed ||of:
(A) sheet ||metal
(B) polyvinyl ||chloride
(C) fiberglass
(D) A ||and ||C
Answer: ||A
Rationale: ||Sheet ||metal ||is ||required ||for ||strength ||and ||durability. ||(UMC ||Section ||506.1)
6. Unlisted ||vented ||gas ||fireplaces ||shall ||have ||a ||clearance ||at ||the ||sides ||and ||rear ||of ||not ||less ||than:
(A) 10 ||in
(B) 12 ||in
(C) 16 ||in
(D) 18 ||in
Answer: ||D
Rationale: ||Clearances ||must ||be ||18 ||inches ||for ||unlisted ||vented ||gas ||fireplaces ||to ||combustible
||materials. ||(UMC ||Section ||908.2(B))
7. Leaks ||in ||gas ||piping ||shall ||be ||located:
(A) with ||a ||sniffer
(B) with ||a ||Presto-Lite ||flame
(C) with ||a ||noncorrosive ||leak-detecting ||fluid
(D) by ||increasing ||air ||pressure ||until ||leaks ||are ||audible
Answer: ||C
Rationale: ||Noncorrosive ||fluids ||are ||used ||to ||safely ||detect ||gas ||leaks. ||(UMC ||Section ||1316.4.2)
8. Condensate ||drain ||piping ||shall ||have ||a ||slope ||of ||not ||less ||than:
(A) 1/8 ||in ||per ||foot
(B) 1/4 ||in ||per ||foot
(C) 1/2 ||in ||per ||foot
(D) 1 ||in ||per ||foot
,Answer: ||A
Rationale: ||Minimum ||slope ||ensures ||proper ||drainage ||by ||gravity. ||(UMC ||Section ||309.1)
9. The ||minimum ||gauge ||of ||steel ||wire ||used ||to ||support ||horizontal ||metal ||ducts ||10 ||inches ||or ||less ||in
||size ||is:
(A) 14 ||AWG
(B) 16 ||AWG
(C) 18 ||AWG
(D) 20 ||AWG
Answer: ||C
Rationale: ||18 ||AWG ||is ||the ||minimum ||gauge ||for ||secure ||support. ||(Table ||6-7(B))
10. When ||smoke ||detectors ||are ||required ||as ||part ||of ||an ||automatic ||shutoff ||system, ||they ||shall ||be
||installed ||in ||the:
(A) return ||air ||duct ||ahead ||of ||any ||fresh-air ||inlet
(B) main ||supply ||air ||duct ||served ||by ||such ||equipment
(C) fresh-air ||inlet
(D) main ||return ||and ||main ||supply ||duct
Answer: ||B
Rationale: ||Placement ||in ||the ||main ||supply ||duct ||ensures ||detection ||before ||air ||is ||distributed.
||(UMC ||Section ||609.0(5))
11. The ||largest ||fuel-burning ||appliance ||allowed ||in ||a ||room ||100'W ||x ||20'L ||x ||8'H ||without
||combustion ||air ||openings ||is:
(A) 80,000 ||Btu
(B) 100,000 ||Btu
(C) 140,000 ||Btu
(D) 320,000 ||Btu
Answer: ||D
Rationale: ||Maximum ||Btu ||rating ||is ||based ||on ||room ||volume ||without ||additional ||combustion ||air.
||(UMC ||Section ||701.2.1)
12. Return ||air ||ducts ||that ||serve ||a ||dwelling ||unit ||shall ||be ||permitted ||to ||be ||of:
(A) non-combustible
(B) combustible
(C) rated
(D) none ||of ||the ||above
Answer: ||B
Rationale: ||Ducts ||can ||be ||combustible ||as ||per ||code. ||(UMC ||Section ||602.2 ||Ex ||(1))
, 13. Solid ||fuel-burning ||appliances:
(A) shall ||be ||connected ||to ||a ||venting ||system ||serving ||gas/oil ||appliances
(B) may ||be ||connected
(C) shall ||not ||be ||connected
(D) may ||if ||special ||approval
Answer: ||C
Rationale: ||Solid ||fuel ||appliances ||must ||not ||share ||a ||venting ||system ||with ||gas/oil ||appliances.
||(UMC ||Section ||802.5.5.1)
14. Any ||joint ||obtained ||by ||joining ||metal ||parts ||with ||alloys ||that ||melt ||at ||temperatures ||higher
||than ||840°F ||but ||lower ||than ||the ||melting ||temperature ||of ||the ||parts ||is ||a:
(A) brazed
(B) fused
(C) welded
(D) soldered
Answer: ||A
Rationale: ||This ||defines ||a ||brazed ||joint. ||(UMC ||Section ||212.0)
15. A ||vessel ||or ||arrangement ||of ||piping ||where ||vaporized ||refrigerant ||is ||liquefied ||by ||removal ||of ||heat
||is ||a:
(A) compressor
(B) generator
(C) evaporator
(D) condenser
Answer: ||D
Rationale: ||Condensers ||remove ||heat ||to ||liquefy ||vapor ||refrigerant. ||(UMC ||Section ||205.0)
16. An ||appliance ||designed ||primarily ||to ||supply ||hot ||water ||with ||automatic ||controls ||limiting
||temperature ||to ||210°F ||is ||a:
(A) water ||heater
(B) steam ||boiler
(C) expansion ||tank
(D) gas ||heater
Answer: ||A
Rationale: ||Water ||heaters ||maintain ||water ||temperature ||below ||210°F. ||(UMC ||Section ||507.1.3)
150 QUESTIONS AND CORRECT DETAILED ANSWERS TOP
RATED VERSION FOR ALREADY A+ GRADED WITH EXPERT
VERIFIED SOLUTIONS
1. Defects ||on ||gas ||piping ||or ||fittings ||shall ||be:
(A) repaired
(B) replaced ||or ||repaired ||and ||retested
(C) repaired ||by ||a ||certified ||welder
(D) ignored, ||as ||the ||operating ||pressure ||is ||much ||less ||than ||the ||air ||test
Answer: ||B
Rationale: ||All ||gas ||piping ||or ||fitting ||defects ||must ||be ||replaced ||or ||repaired ||and ||retested ||to ||ensure
||safety. ||(UMC ||Section ||1316.4.3)
2. Every ||absorption ||refrigerating ||system ||supported ||from ||the ||ground ||shall ||rest ||on ||a
||concrete ||slab ||extending ||not ||less ||than:
(A) 3 ||inches ||below
(B) 3 ||inches ||above
(C) 6 ||inches ||below
(D) 6 ||inches ||above
Answer: ||B
Rationale: ||The ||slab ||must ||be ||3 ||inches ||above ||the ||adjoining ||ground ||level ||to ||prevent ||moisture
||contact. ||(UMC ||Section ||1106.2)
3. Any ||part ||of ||a ||venting ||system ||installed ||at ||an ||angle ||greater ||than ||45 ||degrees ||from ||the
||vertical ||is ||considered:
(A) vertical
(B) horizontal
(C) a ||flat ||vent
(D) an ||offset ||vent
Answer: ||B
Rationale: ||Angles ||greater ||than ||45 ||degrees ||are ||treated ||as ||horizontal ||for ||venting ||calculations.
||(UMC ||Section ||802.6.1.1)
4. Listed ||transition ||ducts ||for ||clothes ||dryers ||shall ||not ||exceed:
(A) 3 ||ft
,(B) 4 ||ft
(C) 5 ||ft
(D) 6 ||ft
Answer: ||D
Rationale: ||Maximum ||length ||of ||transition ||ducts ||for ||dryers ||is ||6 ||feet ||to ||ensure ||proper ||airflow.
||(UMC ||Section ||504.3.2.1)
5. Industrial ||product-conveying ||ducts ||and ||their ||fittings ||for ||abrasive ||and ||nonabrasive ||dust
||or ||solid ||materials ||shall ||be ||constructed ||of:
(A) sheet ||metal
(B) polyvinyl ||chloride
(C) fiberglass
(D) A ||and ||C
Answer: ||A
Rationale: ||Sheet ||metal ||is ||required ||for ||strength ||and ||durability. ||(UMC ||Section ||506.1)
6. Unlisted ||vented ||gas ||fireplaces ||shall ||have ||a ||clearance ||at ||the ||sides ||and ||rear ||of ||not ||less ||than:
(A) 10 ||in
(B) 12 ||in
(C) 16 ||in
(D) 18 ||in
Answer: ||D
Rationale: ||Clearances ||must ||be ||18 ||inches ||for ||unlisted ||vented ||gas ||fireplaces ||to ||combustible
||materials. ||(UMC ||Section ||908.2(B))
7. Leaks ||in ||gas ||piping ||shall ||be ||located:
(A) with ||a ||sniffer
(B) with ||a ||Presto-Lite ||flame
(C) with ||a ||noncorrosive ||leak-detecting ||fluid
(D) by ||increasing ||air ||pressure ||until ||leaks ||are ||audible
Answer: ||C
Rationale: ||Noncorrosive ||fluids ||are ||used ||to ||safely ||detect ||gas ||leaks. ||(UMC ||Section ||1316.4.2)
8. Condensate ||drain ||piping ||shall ||have ||a ||slope ||of ||not ||less ||than:
(A) 1/8 ||in ||per ||foot
(B) 1/4 ||in ||per ||foot
(C) 1/2 ||in ||per ||foot
(D) 1 ||in ||per ||foot
,Answer: ||A
Rationale: ||Minimum ||slope ||ensures ||proper ||drainage ||by ||gravity. ||(UMC ||Section ||309.1)
9. The ||minimum ||gauge ||of ||steel ||wire ||used ||to ||support ||horizontal ||metal ||ducts ||10 ||inches ||or ||less ||in
||size ||is:
(A) 14 ||AWG
(B) 16 ||AWG
(C) 18 ||AWG
(D) 20 ||AWG
Answer: ||C
Rationale: ||18 ||AWG ||is ||the ||minimum ||gauge ||for ||secure ||support. ||(Table ||6-7(B))
10. When ||smoke ||detectors ||are ||required ||as ||part ||of ||an ||automatic ||shutoff ||system, ||they ||shall ||be
||installed ||in ||the:
(A) return ||air ||duct ||ahead ||of ||any ||fresh-air ||inlet
(B) main ||supply ||air ||duct ||served ||by ||such ||equipment
(C) fresh-air ||inlet
(D) main ||return ||and ||main ||supply ||duct
Answer: ||B
Rationale: ||Placement ||in ||the ||main ||supply ||duct ||ensures ||detection ||before ||air ||is ||distributed.
||(UMC ||Section ||609.0(5))
11. The ||largest ||fuel-burning ||appliance ||allowed ||in ||a ||room ||100'W ||x ||20'L ||x ||8'H ||without
||combustion ||air ||openings ||is:
(A) 80,000 ||Btu
(B) 100,000 ||Btu
(C) 140,000 ||Btu
(D) 320,000 ||Btu
Answer: ||D
Rationale: ||Maximum ||Btu ||rating ||is ||based ||on ||room ||volume ||without ||additional ||combustion ||air.
||(UMC ||Section ||701.2.1)
12. Return ||air ||ducts ||that ||serve ||a ||dwelling ||unit ||shall ||be ||permitted ||to ||be ||of:
(A) non-combustible
(B) combustible
(C) rated
(D) none ||of ||the ||above
Answer: ||B
Rationale: ||Ducts ||can ||be ||combustible ||as ||per ||code. ||(UMC ||Section ||602.2 ||Ex ||(1))
, 13. Solid ||fuel-burning ||appliances:
(A) shall ||be ||connected ||to ||a ||venting ||system ||serving ||gas/oil ||appliances
(B) may ||be ||connected
(C) shall ||not ||be ||connected
(D) may ||if ||special ||approval
Answer: ||C
Rationale: ||Solid ||fuel ||appliances ||must ||not ||share ||a ||venting ||system ||with ||gas/oil ||appliances.
||(UMC ||Section ||802.5.5.1)
14. Any ||joint ||obtained ||by ||joining ||metal ||parts ||with ||alloys ||that ||melt ||at ||temperatures ||higher
||than ||840°F ||but ||lower ||than ||the ||melting ||temperature ||of ||the ||parts ||is ||a:
(A) brazed
(B) fused
(C) welded
(D) soldered
Answer: ||A
Rationale: ||This ||defines ||a ||brazed ||joint. ||(UMC ||Section ||212.0)
15. A ||vessel ||or ||arrangement ||of ||piping ||where ||vaporized ||refrigerant ||is ||liquefied ||by ||removal ||of ||heat
||is ||a:
(A) compressor
(B) generator
(C) evaporator
(D) condenser
Answer: ||D
Rationale: ||Condensers ||remove ||heat ||to ||liquefy ||vapor ||refrigerant. ||(UMC ||Section ||205.0)
16. An ||appliance ||designed ||primarily ||to ||supply ||hot ||water ||with ||automatic ||controls ||limiting
||temperature ||to ||210°F ||is ||a:
(A) water ||heater
(B) steam ||boiler
(C) expansion ||tank
(D) gas ||heater
Answer: ||A
Rationale: ||Water ||heaters ||maintain ||water ||temperature ||below ||210°F. ||(UMC ||Section ||507.1.3)
