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 6-6 Which of these piping materials can be used in a collector loop filled with
silicone oil?
a)
Standard pipe dope
b)
Teflon tape
c)
50/50 solder
d)
Fluorosilicone
6-7 Which of these can be used in a closed-loop system's collector loop?
a)
Temperature and pressure relief valve
b)
Draindown solar control valve
c)
Vacuum breaker
d)
Pressure relief valve
6-8 What is the correct maintenance for sleeve bearings on pumps?
a)
No oil is required
b)
Oil every two to five years
c)
Oil once or twice a year
d)
Oil as often as possible
6-9 Which fluid will require a sacrificial anode in the heat exchanger bonnet?
a)
Silicone oil
b)
Ethylene glycol
c)
Tap water
d)
Propylene glycol
6-10 Which of the following fluids is the most toxic?
a)
Deionized water
b)
Ethylene glycol
c)
Synthetic oil
d)
Propylene glycol
6-11 What does pH indicate?
a)
Acidity
b)
Concentration
c)
Temperature
d)
Pressure
MAINTENANCE
6.3 QUESTIONS FOR SELF-STUDY
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