Exam (elaborations)
Millwright (1).
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Exam of 12 pages for the course GPSTC Class 290 at GPSTC Class 290 (Millwright (1).)
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What are the 2 classes of hydraulics? - CORRECTANSWER-Hydrostatic & Hydrodynamic
What causes pressure drop in a hydraulic line? - CORRECT
ANSWER-Excessive Fluid Velocity
What causes aeration in a hydraulic pump? - CORRECT
ANSWER-Air in the suction line
What type of hydraulic cylinder is indicated in the circuit in Figure 1?
- CORRECT ANSWER-Adjustable cushion on extend only
What is Figure 2? - CORRECT ANSWER-Pilot Operated check
valve with a 5:1 line to pilot pressure ratio
What valve is internally piloted from the outlet port and externally
drained? - CORRECT ANSWER-Pressure reducing valve
What valve discharges at a preset pressure? - CORRECT
ANSWER-Pressure Relief Valve
What is the purpose of a pump? - CORRECT ANSWER-Create
Flow
, Which valve limits system pressure when using a fixed
displacement pump? - CORRECT ANSWER-Pressure Relief Valve
What is a symptom of a noisy pump? - CORRECT ANSWER-Low
fluid level in tank
Why can a pressure compensated variable displacement pump
work without a relief? - CORRECT ANSWER-It shifts to minimum
flow
Where is the main purpose pressure relief valve located in a
hydraulic system? - CORRECT ANSWER-Between Pump & control
valve
What instruments are used for testing a hydraulic system? -
CORRECT ANSWER-Tachometer, flowmeter & pressure guage
What are the brownish deposits found on valve spools? -
CORRECT ANSWER-varnish
what is the flare angle for hydraulic tubing that complies with JIC
standards - CORRECT ANSWER-37" included angle
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