How do you test the high limit in a furnace during a maintenance?

Review Questions for Grade 4 Refrigeration

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Construction
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Vocational training
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Easy
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Make a call for heat and stop the airflow.
Increase the airflow to maximum.
Check the thermostat settings.
Inspect the furnace for physical damage.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the best method to determine if a drain line heater for a freezer is operating properly?
Use an ammeter
Check the temperature of the freezer
Inspect the drain line visually
Listen for unusual noises from the heater
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Where is a Snap Acting Device used?
It could be a two position or any on off switch
In complex multi-position control systems
For continuous variable control applications
As a safety interlock mechanism
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How could you repair a leak at the stem of a suction service valve on a refrigeration system?
Replace the entire valve assembly.
Tighten the packing gland and recheck for leaks.
Apply sealant around the valve stem.
Increase the pressure in the system.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Where to install a vibration isolator in a refrigeration system?
Parallel to the crankshaft
At the compressor outlet
Near the evaporator
Before the condenser
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is a Primary consideration when installing a roof top unit
Roof Pitch
Temperature Control
Aesthetic Design
Cost of Installation
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How to test an OFC?
Use jumper 1 & 2 to keep the heater on.
Perform a visual inspection of the OFC.
Check the voltage levels with a multimeter.
Run a software diagnostic test.
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