Which of the following could be the cause for excessive subcooling in an air conditioning system?
A. dirty or blocked condenser coil
B. defective condenser fan motor
C. system operating in low ambient conditions
D. service panels removed from condensing unit
Answer: C
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In a variable-ratio recirculating ball steering gear, the sector teeth have equal lengths.
Answer the following statement true (T) or false (F)
Horizontal loop, vertical loop, slinky loop, and lake loop are all designs for
A) Water source heat pump evaporator coils B) Closed loop water source heat pump applications C) Water source heat pump condenser coils D) Open loop water source heat pump applications
Which one of the following statements is not true for the PLC 5 and SLC 500 counters?
A) Counters store negative values in the in 2's complement format. B) The PRE is 16 bit integer memory register that stores the count value or set point for the number of counts to trigger an output. C) The ACC stores the count value by incrementing one count for every true to false change in the counter ladder rung. D) A reset instruction (RES) is used to return the ACC to zero.
Which type of duct material has a high level of friction to air flow?
A. galvanized metal B. fiberglass-wrapped, spiral duct (flexible duct) C. fiberglass, fiberboard sheeting D. round sheet metal