Germanium and ____ are the most common semiconductor materials used in the electronics field.
A. gold
B. silver
C. silicon
D. iron
Answer: C
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What type of valve is flow-regulating device that uses a flexible, chemical resistant, rubber-type diaphragm to control flow instead of a typical flow-control element?
A) Gate valve B) Diaphragm valve C) Globe valve D) Relief valve
For cyclohexane at = 400 K and P = 1 MPa, use the Peng-Robinson EOS to find the liquid and vapor phase fugacities, and determine which phase is stable at equilibrium.
A. fL = 0.312 MPa, fV = 0.817 MPa, vapor phase stable B. fL = 0.312 MPa, fV = 0.817 MPa, liquid phase stable C. fL = 0.312 MPa, fV = 0.768 MPa, vapor phase stable D. fL = 0.312 MPa, fV = 0.768 MPa, liquid phase stable E. None of these are correct.
Two technicians are discussing a state emission test. Technician A says that a vent valve that is not able to close can cause the system to fail the on-board test. Technician B says that a leaking gas cap can cause a failure of the EVAP test. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B
How can a technician determine when a filter-drier is stopped up and needs changing?
A) The indicating chemical disc will change color. B) The pressure drop will exceed 2 psig. C) The clogged filter flag will pop out. D) The drier will vibrate violently.