Residential central heating and cooling systems became popular in:
A) The mid 70s. B) The late 60s. C) The late 50s. D) The late 70s.
B
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Most soldering jobs in agricultural mechanics can be done with solder composed of
a. 30 percent tin, 70 percent iron c. 50 percent tin, 50 percent lead b. 40 percent copper, 60 percent steel d. 30 percent tin, 70 percent steel
Assume a solar cell produces 0.5 V at peak sunlight. If a total of 12 V needed, what is the minimum number of solar cells required and how must they be connected?
What will be an ideal response?
In an induced-draft gas furnace, the first component to energize on a call for heat is:
A) The hot surface igniter. B) The gas valve. C) The induced-draft blower. D) The indoor blower.
Determine the square feet of waterproofing needed for a rectangular basement 26 feet by 40 feet. The waterproofing is 8 feet high. How many gallons of waterproofing are needed if one gallon of waterproofing will cover 60 square feet?
What will be an ideal response?