When a circuit is intended to be used as a heating thermostat, the operational amplifier must be connected in such a manner that a drop in temperature will produce a ____ at the output.
a. negative voltage
b. positive voltage
c. negative resistance
d. positive resistance
b. positive voltage
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Jacob has 78 acres of alfalfa hay. He expects a yield of 2.8 tons per acre. Jacob is using a square baler, which bales a 16-by-18-by-40-inch bale averaging 85 pounds.
a. How many tons of hay are expected? b. How many bales are expected? c. How many cubic feet does it take to store the hay?
ISO metric and ASME M profile thread series are not interchangeable with Unified thread series because of ____.
A. size variations B. strength variations C. differences in materials D. compatibility issues
Some wood fiber composites made for siding and exterior trim have warranties of up to ____ years, and they require less maintenance than solid wood.
A. 25 B. 35 C. 50 D. 70
In the fire service, the bugle has become a symbol of ______.
a. service b. fraternity c. authority d. courage