Reciprocating chillers have crankcase heaters to ____.
A. preheat the chilled water for better efficiency
B. prevent refrigerant migration to the crankcase
C. preheat the compressor bearings for longer wear
D. minimize condenser subcooling
Answer: B
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Technician A hammers on a tie rod stud to break the taper with the steering knuckle. Technician B uses a puller to separate the tie rod stud from the steering knuckle. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
If the flow rate in a hydronic system is reduced by closing a valve, what happens to the flow and pressure?
A) Flow will increase and pressure drop will decrease. B) Flow will decrease and pressure drop will increase. C) Flow and pressure drop will decrease.
The difference in ____ values causes the current in the auxiliary start winding to slightly lead the current in the run winding.
a. conductance b. conductor c. magnetic d. inductance
Extra caution should be exercised when working near common rail fuel systems because the fuel pressure could reach as high as:
a. 3000 psi b. 13,000 psi c. 30,000 psi d. 300,000 psi