For a hydraulic power unit, this part indicates the amount of oil in the reservoir. Usually, it also indicates the temperature. a. liquid level gauge

Which of the following can be the vacuum pressure? a.   Pressure above atmospheric pressure   b.   Pressure above gauge pressure   c.   Pressure below atmospheric pressure   d. The pressure equal to gauge pressure

For a hydraulic power unit, this part limits the system pressure to safe levels a. reservoir b. electric motor c. hydraulic pump d. relief valve

What is the impact on flow and pressure when the impeller of a pump is trimmed? a. Flow decreases with increased pressure c. Both flow and pressure decrease b. Both flow and pressure increase d. None of the above

Which is not a pressure or force acting on a TXV diaphragm?A. Head pressureB. Evaporator pressureC. Spring pressureD. Bulb pressure

1. Describe the operation of a compressor.

A strong indicator the fluid is circulating is the revolving buoy.  a. venturi meter b. orifice c. pitot tube  d. rotameter

What are the characteristics of oil pumps for boilers and engine generators? Select all that apply. A) They are self-priming. B) They are positive displacement. C) They are centrifugal or axial. D) They use pistons or gears.  Which of the following methods are used to change pump flow to match load in an operating system? Select all that apply. A) Staging of multiple pumps. B) Variable-speed drive.  Who sets standards for water quality? Select all that apply. A) National Institutes of Health. B) The Environmental Protection Agency. C) Local health departments. D) Department of Homeland Security. When would the peak load demand for an office building likely occur? A) Around quitting time on a summer afternoon. B) Noontime in summer. C) Start of the business day. Which of the following fires would constitute a Class B fire? 2) A) Involving combustible metals, such as magnesium. B) Involving wood, cloth, paper, rubber, and many plastics. C) Involving flammable liquids, oils, greases, tars…

A.I) The term pressure drop refers to what in a hydraulic circuit a. The change in the flow rate in the hydraulic circuit b. The change in the fluid’s velocity in the circuit c. The pressure seen on the pressure gauge known as PG main d. The difference in pressure at the inlet of a component compared to the pressure at the outlet of the same component A.II) How are relief valve connected in a hydraulic circuit. a. In series with the pump b. In parallel with the pump c. In either series or parallel depends on the circuit d. Relief Valves are not connected to the pump

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