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1. What part of an analog scale gives the most accurate reading? A.

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1. What part of an analog scale gives the most accurate
A. The last 25% of the scale
B. The first 25% of the scale
C. The midpoint of the scale
D. Typically, analog meters are equally accurate across the
entire scale.
2. Why are slotted-head sheet metal screws usually installed
manually using a flat-blade screwdriver?
A. It isn’t possible to make flat-blade screwdriver tips for
B. The buildup of high static-electricity charges can cause
dangerous arcs.
C. Federal legislation protecting domestic screwdriver manufacturers prohibits the sale of flat-blade screwdriver tips
for power drills.
D. It’s very difficult to keep the bit aligned in the slot when
using a drill.
3. What is a service valve wrench?
A. A pair of pliers that’s used to turn a manual service valve stem
B. A tool used to change the core in Schrader valves
C. A wrench used to install service valves on a hermetic system
D. A wrench with square openings that fits service valve stems
4. What type of threads does a 2 x 3/8 NF – 24 bolt have?
A. Normal capacity, 24 foot pounds of torque
B. National coarse, 24 threads per inch
C. National fine, 24 foot pounds of torque
D. National fine, 24 threads per inch
5. What is the hardest material you should cut with electrical pliers?
A. Copper wire C. Steel cable
B. Nails D. Sheet metal
6. When installing flex duct, what function does a tensioner tool serve?
A. It keeps proper tension on the belt that operates the on-site flex duct fabrication
B. It pulls the duct straps tight at the duct connections to the boot or collar.
C. It stretches the duct tight and eliminates sags.
D. It checks the installed flex duct for the correct tension.
7. What type of fastener is used for on-site assembly of metal ducts?
A. Self-tapping sheet metal screws
B. Wood screws
C. Nails
D. Round-tipped sheet metal screws
8. What IEC category electric meter is intended for measurements on protected
A. Category I C. Category III
B. Category II D. Category IV
9. The best way to remove a pop rivet without damaging the surface through which is
passes is by
A. unscrewing it.
B. striking it with a hammer and a chisel.
C. drilling it out.
D. heating it with a cutting torch.
10. How are staples used for fastening duct insulation different from normal staples?
A. They’re corrugated.
B. They’re stronger, to pierce the sheet metal ductwork.
C. The tips of the staple are bent outward as the staple goes through the fabric.
D. They bend inward to help secure the insulation to the duct.
11. What is the best way to increase the turning force on a hard-to-turn bolt?
A. Use a breaker bar.
B. Strike the socket handle with a hammer.
C. Use a shorter-length socket handle to get a better grip.
D. Slip a length of pipe over the socket handle to increase the leverage.
12. When is it important to make sure to match the polarity of the meter leads to the
polarity of the circuit being tested?
A. When reading resistance C. When reading AC voltage
B. With all readings D. When reading DC voltage
13. One advantage of bending tubing rather than using a brazed elbow is that
A. most large-diameter tubing can be hand bent in radii of less than two times the
tube diameter.
B. the same adjustable spring bender fits all tubing sizes.
C. brazed joints are more likely to kink at the ell than bends.
D. bending doesn’t create oxides inside the pipe like brazing does.
14. With its leads on either side of a switch, a voltmeter reads 120 volts. This indicates
that the switch is
A. open, allowing 120 volts to pass through.
B. open, so voltage can’t pass through.
C. closed, allowing 120 volts to pass through.
D. closed, so voltage cannot pass through.
15. How are voltmeters connected to read the voltage drop across a load in a circuit?
A. One lead is connected to the load, and the other lead is connected to ground.
B. Voltmeters are connected in series with the load.
C. Voltmeters are connected in parallel with the load.
D. Any connection to the circuit will give the same reading.
16. What type of tool is used to loosen the set screws on fan blade hubs?
A. A screw stet C. Hacksaw
B. Locking pliers D. Allen wrench42
17. HVAC/R technicians use deburring tools for
A. preparing a compressor head before applying a head gasket.
B. removing rough edges from electrical wiring.
C. removing the small burr left by pipe cutters.
D. removing splinters from wood frame members.
18. What is the difference between a flare-nut wrench and a standard box wrench?
A. Box wrenches have only four sides and points, but flare wrenches have six
B. Flare wrenches ratchet, and box wrenches don’t.
C. A flare wrench is just another name for a box wrench.
D. The flare wrench head is slotted to slip over the tubing.
19. How are inline ammeters connected to read the current in a circuit?
20. Vinyl/Cloth duct tape aren't used in attics because?

gotoman for ac :

1. C 2 D 3 D 4 B 5A 6B 7A 8D 9D 10C 11a 12d 13D 14A 15C 16D 17C 18D 19 SERIES 20 It get hot and peals and with the attic heat it stetches.

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