What is the difference between a heat recovery ventilator (HRV) and an energy recovery ventilator (ERV)?
a. The ERV can dehumidify in the cooling mode.
b. The HRV can act as a humidifier in the heating mode.
c. The ERV has a durable metal core.
d. The HRV cannot be used in very cold climates.
a
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The ____ is a type of inverter drive in which the current is controlled while the voltage is varied to satisfy the motor's needs.
A. variable voltage inverter B. current source inverter C. digital input inverter D. SCR bridge inverter
Describe how an alternator generates AC power.
What will be an ideal response?
Discuss precision sheet metal parts production.
What will be an ideal response?
What is a practical use for knowing a substance's triple point?
A) Calibrating thermometers using the triple point temperature B) Understanding the practical operating limits of a refrigeration system C) Understanding that a system may not be charged past the triple point of the refrigerant being used D) Triple point is a purely theoretical concept which cannot be actually achieved.