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4.4 Questions for Self-study
Instructions: Choose the one answer you believe is correct. Answers to questions
are in Appendix F.
4-1 What is the best way to warm up a thermistor sensor to test it?
a)
Use the flame of a soldering torch
b)
Warm it in your hand
c)
Drop it into hot water
d)
Bake it in an oven
4-2 A thermistor sensor is removed from a hot collector and left in the shade behind
the collector; What should happen to its resistance?
a)
Go to zero
b)
Go down
c)
Go up
d)
Nothing
4-3 With all sensors disconnected from a functional differential thermostat, a jumper
wire is placed across the collector sensor terminals. What should happen?
a)
The pump should stop running
b)
The pump should run for a few minutes, then stop
c)
The pumps should start running
c)
Nothing
4-4 The wiring to a collector sensor is shorted out. What will happen?
a)
The
pump
will run all the time
b)
The
pump
will run only at night
c)
The
pump
will never run
d)
The
pump
will run normally
TROUBLESHOOTING
133
4.4 QUESTIONS FOR SELF-STUDY





 


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