Photovoltaic systems are ____________________ and can easily withstand outside weather conditions.
Fill in the blank(s) with the appropriate word(s).
strong
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The standard abbreviation for thousand square feet is ____________________
Fill in the blank(s) with correct word
What is the normal charge on a residential diaphragm type of expansion tank?
A) 30 psig B) 60 psig C) 160 psig D) 12 psig
When manually recharging a refrigeration system start by performing a proper evacuation and then weigh in the correct amount of refrigerant by:
A. Dispensing vaporous refrigerant into the discharge side of the system B. Dispensing vaporous refrigerant into the suction side of the system C. Dispensing liquid refrigerant into the discharge side of the system D. Dispensing liquid refrigerant into the suction side of the system
The bestway to vary the speed of a shunt motor is by using a __________.
A. variable power supply B. variable rheostat in the field coil circuit C. variable armature rheostat