Explain how the metering valve operation can be checked with a pressure bleeder.
What will be an ideal response?
Charge thebleeder tank with compressed air to about 40 psi, and connect it to the master cylinder, as explained earlier in this chapter. Do not override the metering valve manually or with a special tool. Pressurize the hydraulic system with the pressure bleeder and open a front bleeder screw. If fluid flows at pressure from the bleeder, the metering valve is not closing at the right pressure and must be replaced.
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Technician A says that you should begin HVAC problem diagnosis with a thorough inspection. Technician B says that you can determine from the inspection what type of system you are dealing with. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
The electrical conductivity (EC) of a paste of a saline soil and water is generally less than 4 dS/m
Indicate whether the statement is true or false
The term viscosityindexrefers to _____
a. the lowest temperature at which an oil flows freely b. how the viscosity of oil varies with temperature c. the temperature index at which oil gives off ignitable vapors d. the service life of various oil and grease products
What type of weld would be used if the ends of the pieces that are to be welded are prepared to be square, beveled, U-shaped, or J-shaped?
A. fillet weld B. groove weld C. surfacing weld D. plug weld