Technician A says that the current flow through a rear-window defogger can be often self-regulating. Technician B says that as the temperature of the grid decreases, its resistance decreases, reducing current flow. Who is right?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
A
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What will be an ideal response?The effective calcium carbonate (ECC) rating of a liming material is determined by its
a. cation exchange capacity b. base saturation and pH c. active and reserve acidity d. purity and fineness
Hot Surface Ignition System (HSI) controls lockout after how many unsuccessful attempts?
A) Two attempts B) One attempt C) Three or more attempts D) The controls do not lock out.
How does an energy-recovery wheel improve system efficiency?
A) By keeping the evaporator clean B) By moving some of the system refrigerant with a turbulator C) By reducing the condenser head pressure D) By transferring heat between the ventilation air and the exhaust air