In a hydraulic system, （） are used to protect the system from over pressure.

A、stop valves

B、check valves

C、safety valves

D、reducing valves

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更多“In a hydraulic system, （） are used to protect the system from over pressure.”相关的问题

第1题

[单选题] An orifice-check valve placed in a hydraulic system is used to（）

A、regulate the fluid flow in either direction B、restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction C、allow free movement of hydraulic fluid in both directions D、allow a restricted fluid flow in one direction only

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第2题

[单选题] In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）

A、the temperature of the hydraulic fluid B、the flow rate of the hydraulic fluid C、the temperature of the cooling water D、all of the above

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第3题

[单选题] Which of the following can be used in hydraulic transmission system?（）

A、Hydraulic oil B、Animal oil C、Light oil D、Fuel oil

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第4题

[单选题] In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause（）

A、molecular fluid vibration B、energy losses C、wide pressure variations D、mechanical damage to control valves

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第5题

[] If a hydraulic pump is overheating, the cause may be （）.

A、A.excessive internal leakage in the pump B、B.low discharge pressure and fluid flow C、C.excessive fluid level in the hydraulic reservoir D、D.operation of the pump at 100% efficiency

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第6题

[单选题] Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.

A、pump bearings in poor condition B、excessively worn actuator-piston packing C、broken directional control valve centering springs D、low hydraulic oil viscosity

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第7题

[] In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause （）.

A、A.molecular fluid vibration B、B.energy losses C、C.wide pressure variations D、D.mechanical damage to control valves

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第8题

[单选题] Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to（）

A、allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque B、prevent either main pump from being hydraulically motored when idle by cross pressure flow C、prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system D、all of the above