《膜电极性能评估》测试题-调查问卷模板-问卷网

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What is the meaning of MEA testing in sub-scale single cells?

小规模单电池MEA测试的意义？

A.it saves material and other resources during MEA development在MEA开发过程中节省材料及其他资源

B.performance testing in single cells is more precise than in stacks单电池性能测试比电堆测试更加精确

C.it saves time during MEA development在MEA开发过程中节省时间

D.performance testing in single cells is faster than in stacks单电池性能测试比电堆测试更加快速

MEA performance testing at stoichiometric gas flows can be done in stacks (full-size BPP) and in sub-scale cells (small size, serpentine flow fields). What are the intrinsic differences in testing conditions?

化学计量气流量下的MEA性能测试均可在电堆（全尺寸双极板）和小规模电池（小尺寸、蛇形流场）中进行。其测试工况的内在差异是什么？

A.the temperature gradient is very different 大不相同的温度梯度

B.the RH gradients are very different 大不相同的湿度梯度

C.he pressure gradients are very different 大不相同的压力梯度

D.the gas concentration gradients are very different 大不相同的气体浓度梯度

An MEA is operated under stoichiometric conditions in a stack. At which part of the active area will the current density reach a maximum?

在电堆中的化学计量工况下运行MEA。在活化区域的哪个部分，电密会达到最大值？

A.between the air inlet and the middle of the active area进气口与活化区域中部之间

B.the current density is usually equal in all parts of the active area所有活化区域的电密均相等

C.between the middle and the air outlet中间部分和空气出气口之间的区域

D.always at the H2 inlet 一直是氢气进气口区域

Which condition gradient has the biggest impact on local MEA performance and distribution of the current density over the active area (at stoichiometric gas flows)?

哪个工况梯度对局部MEA性能和活化区域上的电密分布（化学计量气流量）影响最大？

A.the temperature gradient in the MEAMEA温度梯度

B.the pressure gradient in the cathode flow field 阴极流场区域的压力梯度

C.the O2 concentration gradient in the cathode flow field阴极流场中的氧气浓度梯度

D.the H2 concentration gradient in the anode flow field阳极流场区域的氢气浓度梯度

What is the advantage of single-cell testing under differential conditions?

使用均一性工况条件进行单电池测试的好处是什么？

A.the MEA performance can be tested under precisely defined conditions without gradients between in- outlet of the active area 可在精确定义的工况下进行MEA性能测试，且其活化区域的进出气口之间没有梯度变化

B.for any specific location of the active area in a stack, the conditions can be calculated and the expected local performance can be tested (mapping of performance gradients across the active area) 可以计算电堆活化区域内任何特定位置的工况并测试其预期的局部性能表现（绘制活化区域的性能梯度）

C.the test results allow direct prediction of the stack performance可直接通过测试结果预测电堆性能表现

D.the gradients of conditions are very similar to those in the stack (full size MEA)其工况梯度与电堆中的工况梯度十分相似（全尺寸MEA）

How can one reach differential conditions in a MEA test cell?

在MEA单电池测试中如何实现微分条件？

A.active area should be large 活化区域范围很大

B.gas flows should be stoichiometric 应为化学计量的气流

C.gas flows must be high, relatively to the active area (stoich 10) 相对于活化区域，气体流量必须很高（stoich 10

D.active area should be small 活化区域范围很小

《膜电极性能评估》测试题

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