The removal of all remaining combustion gasses from a boiler after firing is accomplished by ___________
A. pre-purge
B. post purge
C. blow down
D. water washing
B
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?All of these statements about gas-filled shock absorbers are true EXCEPT:
A. ?The gas charge creates a mild boost in spring rate B. ?The primary function of the gas charge is to minimize aeration of the hydraulic fluid C. ?A gas-filled shock absorber provides continuous damping action with very little wheel movement D. ?A hydrogen gas charge is used in most shock absorbers and struts
Assuming the liquid is an ideal solution, determine the bubble point pressure, and determine whether the first bubble of vapor contains more product (C+D) or more reactant (A+B).
A reaction A+B?C+D occurs in the liquid phase. A vessel contains a liquid at P=0.5 MPa and T=298.15 K. The vessel initially contains 10 moles of A and 10 moles of B, but the reaction is allowed to reach equilibrium at P=0.5 MPa and T=298.15 K. After the reaction reaches equilibrium, the pressure is reduced isothermally until the first bubble of vapor forms. The equilibrium constant for the reaction is 0.8. Vapor pressures are 0.120MPa for compound A, 80kPa for compound B, 0.150MPa for compound C and 70kPa for compound D.
What is the recommended location to store a HEV ignition key during service?
A) leave the key in the ignition B) Top of the technician's tool box C) Lock box D) In the vehicle glove box
How is the water flow in a hydronic heating system checked?
A) By measuring the pressure drop across the water pump and comparing it to a pumping performance chart B) By measuring the amp draw of the pump motor an applying the formula gp = amps x 1.73 C) By measuring the pump motor RPM using a digital tachometer D) By measuring the impeller RPM using a stroboscope