Pre-read/Pre-test questions Flashcards
Emery cloth, which is a type of ______, is used to clean and smooth surfaces
Abrasive
When cutting holes for air registers and vents, it is best to use a ____.
reciprocating saw
When installing parts that must be straight, plumb, or perfectly horizontal, use a ____.
level
A twist drill bit has ____ to remove chips from the hole as it is being drilled.
flutes
A ____ wrench is used to measure and regulate the amount of tightness applied to a fastener.
torque
Which of the following grades of emery cloth is the finest grade?
A) 1/2
B) 1
C) 00
D) 0000
0000
A \_\_\_\_ punch is used to drive out keys and to line up holes in mating parts. A) prick B) pin C) drift D) center
drift
When dipped in a bath of ice and water, a thermometer should read within 1°F of \_\_\_\_. A) 0°F B) 20°F C) 32°F D) 212°F
32 degrees F
A \_\_\_\_ punch is used to mark the location of a hole that needs to be drilled. A) center B) drift C) pin D) prick
center
A manometer is typically used to measure pressure values that are hundreds of psi greater than atmospheric pressure.
False
A multimeter can measure the voltage, resistance, and current of a circuit.
True
Alcohol is an acceptable cleaning solvent for refrigeration system components.
True
In the whole number system for identifying drill bit sizes, a No. 50 drill bit has a larger diameter than a No. 20 drill bit.
False
Describe a box-end wrench
Enclosed grips on each side to safely grip the nut or bolt
Describe an open-end wrench
Open grips on each side with a different size head
Describe a combonation wrench
Has the same size open end head and box end head on each side
Adjustable wrenches are for _______ torque only
medium
Describe a flare nut wrench
Similar to an open end wrench only with a smaller opening in the gripping head. Used for flare nuts with SAE fittings.
How many points do hex keys (Allen keys) have?
six
What end of a service valve wrench must be used for cracking service valves?
The fixed (locked) end.
Why is a torque wrench important?
To provide proper amount of tightness and avoid warping or damaging parts.
Two common types of hammers used by HVACR Technicians?
Ball peen and Standard straight claw hammer
What should be used when putting tube in a vice?
Brass jaw caps
What is a shank?
Part of the bit that clamps onto the chuck
A tap drill should be slightly _____ than the inside diameter of the threads for which the hole is being drilled
larger
A pin punch is used for
driving pins in or out
Prick punch (Scratch Awl) is used for
layout work
A hacksaw blade should not be stroked faster than
60 strokes per minute
Hacksaw blades are _______
directional
Use a ______ drill to make holes in masonry
hammer
How would you check a thermometers accuracy?
ice water bath
A manometer with a pitot tube is used for measuring ______ in ductwork
velocity
A manometer is a type of pressure gauge that measures values around atmospheric pressure.
True
What are gaskets for?
To make a leak-proof joint
Keep files clean by using a ______
file card
trade name of a regular adjustable wrench?
crescent or craftsmen wrench
Another name for a close-quarter tube cutter?
Imp cutter
Tube cutters can cut _______ and ________ tubing
copper and aluminum
Most important part of using a tube cutter is to make sure:
Make sure you tighten the cutting wheel 1/4 at a time ensuring a full turn.
What is an inner/outer reamer used for?
removing burrs from the inside and outside of tubing
Swaging tools are used to join two pipes of the same size together
True
Tube benders are available in ________ , ________ and the _______ type
spring, lever, gear
What are tube brushes used for?
To remove oxidization from copper tubing, pipe, and fittings in preparation for soldering or brazing
Pinch off tool (vice-grips, locking pliers) is used to
seal off copper tubing
What is a vacuum pump for?
for servicing air conditioning and refrigeration systems by removing air and non-condensable gases from the system.
What is a fin straightener for?
straightening condenser and evaporator coil fins 8,9,10,12,14 and 15 fins per inch
Why are heat guns needed?
To warm refrigerant and melt ice
What is a soldering gun primarily used for?
To solder electrical connections
A flaring tool is used to
put a flare on the end of copper tubing
What is a sling psychrometer used for?
to obtain relative humidity readings quickly using the wet-bulb/dry-bulb principle
two types of refrigerant leak detectors are?
- electronic leak detector
- high-intensity ultraviolet lamp leak detector
- ultrasound leak detector
list the components usually associated with a gauge manifold unit?
- compound gauge (low pressure and vacuum)
- high pressure gauge
- manifold
- valves
- hoses
list three types of thermometers
glass stem, digital, dial indicator
What is the purpose of a draft gauge?
check the pressure of the flue gas in gas and oil furnaces to ensure that the flue gases are moving up the flue at a satisfactory speed
When are air velocity measurement instruments used?
for balancing duct systems, checking fan and blower characteristics, and making static pressure measurements
List and describe three methods of securing an object to a wall made of gypsum board
- Wall anchors
- Toggle bolts
- Plastic toggle drywall anchors
hollow rivets are assembled in a pin that is often called:
a mandrel
