3-57.
A refrigerant compressor has been
overhauled.
What is the first step
you should take to remove the air
from the compressor?
1.
Disconnect the connection in
the discharged gauge line
between the stop valve and the
compressor
2.
Disconnect the connection on
the compressor suction line
3.
Start the compressor and let it
run until a vacuum is obtained
4.
Remove all oil from the
compressor crankcase
3-58.
You are trying to locate the
refrigeration purge valve.
Most
likely you can find the valve in
which of the following locations?
1. At the bottom of the condenser
2. At the top of the condenser
3. At the midsection of the
condenser
4. On the condenser gauge line
3-59.
In which of the following areas
would air that enters a
refrigeration plant tend to
collect?
1. Upper part of the receiver
2. Upper part of the condenser
3. Inlet end of the condenser
4. Downstream end of the cooling
coil
3-60.
In a refrigeration system, what is
the purpose of the purge valve?
1.
To take out unpleasant fumes
from the refrigerant
2. To vent off excess refrigerant
during an emergency
3.
To remove any air that may
accumulate in the system
4.
To permit the opening of the
refrigeration system for
cleaning and inspecting
3-61.
On an air-cooled condenser, the
exterior surfaces of the tubes and
fins are dirty and restricting air
circulation.
Which of the
following items should you use to
clean these surfaces?
1.
Jets of steam
2.
Hot-water lances
3. Compressed-air lances
4.
Stiff-bristled brushes
3-62.
You are testing the condenser tubes
for leakage.
Why do you hold the
exploring tube of the leak detector
at one end of each condenser tube
for about 10 seconds before driving
a cork into each end of the tube?
1.
To dry the tube heads
2.
To detect the presence of R-12
3.
To draw fresh air through the
tube
4.
To vaporize any water left in
the tube
3-63.
You are attempting to locate leaks
in a refrigeration condenser.
Before continuing the tests, you
should allow the condenser to
remain idle for what minimum period
of time after all tubes in the
suspected section have been corked?
1.
2 to
4 hr
2.
4 to
6 hr
3.
6 to
8 hr
4.
8 to 10 hr
3-64.
When the thermostatic valve is
operating properly, how does the
temperature at the outlet side of
the valve compare with the
temperature at the inlet side?
1.
The temperature is lower at the
outlet side
2.
The temperature is lower at the
inlet side
3.
The temperature is
approximately the same at the
outlet and the inlet sides
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