The discharge air setpoint of a direct-fired make-up air unit is usually _____.
a. about 25°F below the desired room temperature
b. at or slightly above the desired room temperature
c. at least 25°F above the desired room temperature
d. at least 40°F above the desired room temperature
b. at or slightly above the desired room temperature
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In the above figure, the __________ of the amplifier output determines which direction the servo valve causes the linear actuator to move.
A. amplitude B. polarity
Which of the following is calculated from data collected on the calves of the bull?
A. pedigree B. heritability C. EPD D. all answers are correct
Why are thermostatic expansion valves often used as the outdoor metering device for the heating cycle?
A) TEVs are easier to install on the outdoor coil. B) The TEV can modulate the refrigerant flow over the wide range of temperatures experienced in the heating mode. C) TEVs allow the system pressures to equalize in the off cycle, allowing the use of low starting torque compressors. D) TEVs can be adjusted in the field to match the heat pump's performance with the climate it will be operating in.
When a triac is connected in an AC circuit, the output voltage is alternating current.
Answer the following statement true (T) or false (F)