Technician A says that after retrofitting an R-12 truck A/C system to R-134a, the system can be serviced using R-12 service equipment. Technician B says that a more powerful vacuum pump is required to evacuate a HFC-134a system. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: B
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At 250 psi, water has vf = 0.01865 ft3/lbm and vg = 1.845 ft3/lbm. A saturated mixture of water at 250 psi has a quality of 0.71.
(a) Determine the specific volume of the water. (b) If the water occupies a volume of 10 ft3, determine the mass of the water. Given: vf = 0.01865 ft3/lbm; vg = 1.845 ft3/lbm; x = 0.71 What will be an ideal response?What will be an ideal response?
The subsequent problems deal with the circuit below:
NOTE: Assume the op amp is ideal.If V2 = ?2 V, what is I3?
A. 2 mA B. 5 mA C. 3 mA D. 7 mA E. 2.5 mA
The hormone produced by the ovarian follicles that causes sexual excitability is:
A. progesterone B. prostaglandin C. estrogen D. luteinizing hormone
A defective thermostat can cause the powertrain control module (PCM) to set what diagnostic trouble code (DTC)?
A) P0171 B) P0172 C) P0300 D) P0128