CDC 3E151 - HVAC/R JOURNEYMAN VOLUME 1 EXAM QUESTIONS WITH COMPLETE SOLUTIONS GRADED A+
(001) When using a halide leak detector, the bluish flame turning green indicates
a refrigerant leak
(001) On a manifold gauge assembly, the vacuum hose is 3/8 inch and the other hoses are 1/4 inch because ...
(001) When using a halide leak detector, the bluish flame turning green indicates
a refrigerant leak
(001) On a manifold gauge assembly, the vacuum hose is 3/8 inch and the other
hoses are 1/4 inch because larger sizes allow for
fewer restrictions which makes it easier and quicker to pull a vacuum
(001) Why should the manifold gauge assembly not be used when measuring a
vacuum?
The gauge assembly reads inches of mercury and is not accurate when pulling deep
vacuums
(002) While taking a reading with an infrared thermometer, what happens as you
get further from the object being measured?
The reading becomes more inaccurate
(003) What part of the combustion analyzer gets placed into the stack?
The probe
(003) What transfers flue gases from the boiler stack to the indicator unit?
A tube and hand bulb
(003) The special slide-rule calculator and CO2 indicator are used to determine
combustion efficiency and stack loss
(004) What will occur if you choose more than one conductor to measure when
using a clamp on meter?
Incorrect readings
(004) A megohmmeter should never be used on a live circuit because
it has its own power source and it will ruin the meter
(004) A capacitance checker is used to test
a capacitor
(005) A photo tachometer is used to read the
revolutions per minute (RPM) of a spinning motor shaft
, (005) When using a stroboscope, the frequency and reading is displayed for the
technician when the object appears to be
standing still and the rpm of the equipment matches
(005) What pressure will be given if both tubes are connected to the inclined
manometer?
Velocity pressure
(005) Magnehelic pressure gauges were developed to
overcome the disadvantages of the inclined and the inclined vertical manometers
Why does the magnehelic gauge need more frequent calibration?
Because it is a mechanical instrument and is sensitive to physical abuse, dirt, dust,
corrosive gases, and fluids
(005) Why is the accuracy at filters, louvers, and coils very rough?
Due to the uncertainty of the Ak ( correction factor) area
(005) In order to be measured by the flow hood, how is all of the air forced to flow
through the diffuser or grille?
A flow hood or capture box completely surrounds and covers a diffuser or grille
(005) When are flow hoods especially practical?
In existing buildings where the manufacturers or Ak factors of the outlets are not known
(005) If you need a tool that functions as a balancing flowmeter you should select
a circuit tester
(006) When pipe is needed for a high pressure application you should select
extra strong pipe
(006) Pipe should not be threaded when it is
a wall thickness less than standard weight
(006) When would flanges be installed?
Wherever it may be necessary to open the joint for service or replacement of
components
(007) What must be done before you apply pressure on the dies?
Be sure you have the oil running to help start the segments on the pipe
(007) How are the die segments released?
Release lever
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller NurseAdvocate. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.99. You're not tied to anything after your purchase.
