Soft copper tubing is _____ than drawn copper tubing.
a. heavier
b. more expensive
c. less brittle
d. more likely to split when flared
c. less brittle
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In a potential transformer, the voltage across the secondary terminals is always lower than the primary voltage and is rated at _____.
a. 100V b. 120V c. 150V d. 170V
When do normally open relay contacts close?
A) When the relay coil is energized B) When the relay coil is de-energized C) When they receive power D) They cannot close because they are open contacts.
Hint: 
In the series circuit, if the impedance is 70 ohms and the reactance is 50 ohms, what is the value of the resistance? Round the answer to the nearer ohm.
Fill in the blank(s) with the appropriate word(s).
The English system is the most used in heating and air conditioning.
Answer the following statement true (T) or false (F)