Chp 16 test hydra ans

Front

A tandem two-stage system harnesses the benefit of two ____ flow any time the system pressure is low and prevents engine lugging when system pressures are high.

Back

hydraulic pumps’

Front

Open-center hydraulic systems use a directional control valve that will route oil flow back to the ____ when the valve is in the neutral position.

Back

reservoir

Front

A good average open-center system pressure could range anywhere from 50 psi (3.4 bar) up to ____.

Back

300 psi (21 bar)

Front

Who is correct regarding open-center hydraulic systems: Technician A says they do not need a complex signal network to operate, and Technician B says there will be some inefficiency due to high amounts of constant oil flow?

Back

Both A and B.

Front

Which equation is used to determine hydraulic horsepower? Options: Flow (gpm) × Pressure (psi) ÷ 1714, Torque (ft-lbs) × Speed (rpm) ÷ 5252, Flow (gpm) ÷ Pressure (psi) × 100, Volumetric efficiency × Mechanical efficiency

Back

Flow (gpm) × Pressure (psi) ÷ 1714

Front

The term ____ describes a traditional excavator hydraulic pump.

Back

open loop

Front

The term ____ describes a pump that has some type of extra oil assistance, such as return oil from a hydraulic motor.

Back

open loop

Front

Open-center hydraulic systems have all of the following advantages, EXCEPT: simple, economical, easily interchangeable, hydraulically efficient.

Back

hydraulically efficient.

Front

Which component in an open-center hydraulic system is primarily responsible for maintaining system pressure within safe limits? Options: Reservoir, Hydraulic cylinder, Relief valve, Directional control valve

Back

Relief valve

Front

In an open-center hydraulic system, what happens to the pump flow when all control valves are in the neutral position?

Back

Flow returns to the reservoir with minimal resistance