A heat pump thermostat will typically attempt to start the electric heat to supplement the heat pump when the setpoint is _____.
a. 1°F (0.5°C) above the room temperature
b. 1°F to 2°F (0.5°C–1.1°C) above the room temperature
c. 2°F to 3°F (1.1°C–1.7°C) above the room temperature
d. 4°F to 5°F (2.2°C–2.8°C) above the room temperature
c. 2°F to 3°F (1.1°C–1.7°C) above the room temperature
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A wind gene?rator produced 
kwh during a 
hour period. What is the average hourly output of the generator?
Fill in the blank(s) with the appropriate word(s).
The EPA law that imposes liability on owners or operators of a facility from which there is a release of hazardous substances into the environment is _____.
a. SDWA b. CERCLA c. TSCA d. NORA
Find the voltage v?(t) in the circuit of Fig. 18.49. Let  figure 1.png)
 figure 1.png)
Chain idlers can be used for:
A. slack adjusters. B. to change speed. C. to increase torque. D. all the above.