A difference between a straight heat-cool thermostat and a heat pump thermostat is that
A) heat pump thermostats do not energize the fan in the heating cycle
B) Y is energized in heating instead of cooling
C) Y is energized in both heating and cooling
D) Y and W swap functions
C
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Which of these is NOT an advantage of a series hybrid design?
A) No transmission is necessary B) Smaller internal combustion engine C) A single-speed gearbox can be used D) All of these are advantages of the series hybrid design
The ideal range of relative humidity for promoting health is:
A) 75 to 100 percent. B) 30 to 60 percent. C) 50 to 70 percent. D) 10 to 20 percent.
An air conditioner with a thermostatic expansion valve is operating with a condenser saturation temperature of 110°F and a liquid-line temperature of 85°F. The factory-specified subcooling for the current operating condition is 10°F. After checking the condenser coil and airflow, the technician should:
A) Leave the charge alone because it is cooling even better than factory specifications. B) Recover charge because the system is overcharged. C) Add charge because the system is undercharged. D) Move some of the charge from the low side of the system to the high side of the system to balance the charge.
Th switch in the circuit shown below has been closed for a long time before it is opened at t = 0. Find the current i(t) through the inductor for t ? 0. Assume R1 = 2 k?, R2 = 1 k?, R3 = 15 k?, Is = 3 mA, L = 200 mH.
