CDC 3E151 - HVAC/R JOURNEYMAN VOLUME 1 EXAM
QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS
VERIFIED LATEST UPDATE 2026/2027
(001) When using a halide a refrigerant leak
leak detector, the bluish
flame turning green
indicates
(001) On a manifold gauge fewer restrictions which makes it easier
assembly, the vacuum hose and quicker to pull a vacuum
is 3/8 inch and the other
hoses are 1/4 inch because
larger sizes allow for
,(001) Why should the The gauge assembly reads inches of
manifold gauge assembly mercury and is not accurate when
not be used when pulling deep vacuums
measuring a vacuum?
(002) While taking a reading The reading becomes more inaccurate
with an infrared
thermometer, what happens
as you get further from the
object being measured?
(003) What part of the The probe
combustion analyzer gets
placed into the stack?
(003) What transfers flue A tube and hand bulb
gases from the boiler stack
to the indicator unit?
(003) The special slide-rule combustion efficiency and stack loss
calculator and CO2 indicator
are used to determine
, (004) What will occur if you Incorrect readings
choose more than one
conductor to measure when
using a clamp on meter?
(004) A megohmmeter it has its own power source and it will ruin
should never be used on a the meter
live circuit because
QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS
VERIFIED LATEST UPDATE 2026/2027
(001) When using a halide a refrigerant leak
leak detector, the bluish
flame turning green
indicates
(001) On a manifold gauge fewer restrictions which makes it easier
assembly, the vacuum hose and quicker to pull a vacuum
is 3/8 inch and the other
hoses are 1/4 inch because
larger sizes allow for
,(001) Why should the The gauge assembly reads inches of
manifold gauge assembly mercury and is not accurate when
not be used when pulling deep vacuums
measuring a vacuum?
(002) While taking a reading The reading becomes more inaccurate
with an infrared
thermometer, what happens
as you get further from the
object being measured?
(003) What part of the The probe
combustion analyzer gets
placed into the stack?
(003) What transfers flue A tube and hand bulb
gases from the boiler stack
to the indicator unit?
(003) The special slide-rule combustion efficiency and stack loss
calculator and CO2 indicator
are used to determine
, (004) What will occur if you Incorrect readings
choose more than one
conductor to measure when
using a clamp on meter?
(004) A megohmmeter it has its own power source and it will ruin
should never be used on a the meter
live circuit because
