The most common type of single-phase motor used in HVACR equipment is:
A) Permanent split capacitor (PSC). B) Repulsion start induction run (RSIR).
C) Capacitor start induction run. D) Series wound universal DC motor.
A
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Three years ago, Witt Gas Controls purchased equipment for $80,000 that was expected to have a useful life of 5 years with a $9000 salvage value. Increased demand necessitated an upgrade costing $30,000 one year ago. Technology changes now require that the equipment be upgraded again for another $25,000 so that it can be used for 3 more years. Its annual operating cost will be $48,000 and it will have a $19,000 salvage value after 3 years. Alternatively, it can be replaced with new equipment that will cost $68,000 with operating costs of $35,000 per year and a salvage value of $21,000 after 3 years. If replaced now, the existing equipment will be sold for $12,000.
(a) Calculate the annual worth of the defender at an interest rate of 10% per year. (b) Determine the AW of the challenger over 3 years and select it or the defender.
How does a waste-spark ignition system fire the spark plugs?
A) The waste spark is sent to the cylinder next to the cylinder being fired B) The same plug always is fired straight or reverse polarity C) The polarity reverses at each firing (flip flops) D) Both A and C
The coolant bypass circuit ________
A) Prevents excessive coolant pressure when the thermostat is closed B) Eliminates hot spots during engine warm up C) Both A and B D) Neither A nor B
Beginning with the 2002 model year on the Lincoln LS and the Ford Thunderbird, Ford divided the GEM into two control modules. These modules are referred to as the:
A. GEM and the BCM B. BCM and the ABCM C. FEM and the REM D. IPC and the MIC