• 2022-06-07 问题

    对于蒸汽动力循环要提高热效率,可采取一系列措施,以下说法不正确的是()。 A: 同一Rankine循环动力装置,可提高蒸气过热温度和蒸汽压力 B: 同一Rankine循环动力装置,可提高乏气压力。 C: 对Rankine循环进行改进,采用再热循环。 D: 对Rankine循环进行改进,采用回热循环。

    对于蒸汽动力循环要提高热效率,可采取一系列措施,以下说法不正确的是()。 A: 同一Rankine循环动力装置,可提高蒸气过热温度和蒸汽压力 B: 同一Rankine循环动力装置,可提高乏气压力。 C: 对Rankine循环进行改进,采用再热循环。 D: 对Rankine循环进行改进,采用回热循环。

  • 2022-06-06 问题

    Which indexes are economic indexes of Rankine Cycle ( ) A: Thermal efficiency B: Coal rate C: Heat rate D: Steam rate

    Which indexes are economic indexes of Rankine Cycle ( ) A: Thermal efficiency B: Coal rate C: Heat rate D: Steam rate

  • 2022-06-07 问题

    For the following cycles, which belong to power cycles ( ) A: Reheat Cycle B: Regenerate Cycle C: Rankine Cycle D: Refrigeration Cycle

    For the following cycles, which belong to power cycles ( ) A: Reheat Cycle B: Regenerate Cycle C: Rankine Cycle D: Refrigeration Cycle

  • 2022-05-31 问题

    According to Maximum Principal Stress theory (also known as Rankine's theory of failure), elastic failure occurs ( ) A: when the minor principal stress is equal to the elastic limits value in a simple tension test B: when the greatest principal stress reaches the elastic limit value in simple tension test C: when the greatest principal stress is equal to the stress corresponding to the upper yield limit in a tension test D: none of the above

    According to Maximum Principal Stress theory (also known as Rankine's theory of failure), elastic failure occurs ( ) A: when the minor principal stress is equal to the elastic limits value in a simple tension test B: when the greatest principal stress reaches the elastic limit value in simple tension test C: when the greatest principal stress is equal to the stress corresponding to the upper yield limit in a tension test D: none of the above

  • 2022-06-11 问题

    朗肯土压力理论是内英国科学家朗肯(rankine)于1857年提出。朗肯理论的基本假定为:(1)挡土墙背竖直,墙面为光滑,不计墙面和土层之间的摩擦力;(2)挡土墙后填土的表面为水平面,土体向下和沿水平方向都能伸展到无穷,即为半无限空间;(3)挡土墙后填土处于极限平衡状态。()

    朗肯土压力理论是内英国科学家朗肯(rankine)于1857年提出。朗肯理论的基本假定为:(1)挡土墙背竖直,墙面为光滑,不计墙面和土层之间的摩擦力;(2)挡土墙后填土的表面为水平面,土体向下和沿水平方向都能伸展到无穷,即为半无限空间;(3)挡土墙后填土处于极限平衡状态。()

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