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2015年电工进网作业许可续期考试复习题及参考答案.doc

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<p>2015年电工进网作业许可续期考试复习题及参考答案 一、单选题 &nbsp;下列每题有四个答案,其中只有一个正确答案,请将正确答案填在括号内。 1、如题图1-1所示,Rab=(D)Ω。 A &nbsp;33 &nbsp; B &nbsp;30 &nbsp; C &nbsp;15 &nbsp; D &nbsp;9 2、 电阻和电感串联电路中,用( &nbsp;C )表示电阻,电感及阻抗之间的关系。 A 电压三角形 &nbsp; B 功率三角形 &nbsp; C 阻抗三角形 &nbsp; &nbsp; &nbsp; D 电流三角形 3、一段电阻电路中,如果电压不变,当电阻增加1倍时,电流将变为原来的( B &nbsp;)倍。 A &nbsp;1/4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;1/2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 不变 4、当电源电压不变时,三相对称负截在星形连接时和三角形连接时有功功率之比等于( C &nbsp;)。 A &nbsp;3:1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;:1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp;1:1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 1:3 5、在R-L-C串联电路中,交流电路的电抗X等于( &nbsp;A )。 A &nbsp; &nbsp; &nbsp; B &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 6、电路为超前的功率因数时,( D &nbsp;)成立。 A &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; &nbsp; &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 7、将三相电源的首、末端依次相连,再从三个连接点引出三根端线就是三相电源的( &nbsp;B )。 A &nbsp;星形连接 &nbsp; &nbsp;B &nbsp;三角形连接 C &nbsp;既不是星形连接也不是三角形连接 &nbsp; &nbsp; D &nbsp;既是星形连接又是三角形连接 8、我国交流电的频率为,其周期为( B &nbsp;)s。A &nbsp;0.01 B &nbsp;0.02 C &nbsp;0.1 D &nbsp;0.2 9、电阻和电容串联的交流电路中的有功功率计算公式是( D &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; C &nbsp; &nbsp; &nbsp; D &nbsp; 10、电力系统中以kWh作为( B &nbsp;)的计量单位。A &nbsp;电压 B &nbsp;电能 C &nbsp;电功率 D &nbsp;电位 11、电容与电源之间进行能量交换的多少用( A &nbsp;)表示。 A &nbsp;无功功率 &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;有功功率 C &nbsp;视在功率 &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;无功功率加有功功率的和 12、电感元件在正弦交流电路中( C &nbsp;)。A &nbsp;流过的正弦电流与电压同相位 B &nbsp;流过的正弦电流超前电压90°相位角C &nbsp;流过的正弦电流滞后电压90°相位; D &nbsp;所耗功率任何瞬间不为负值 13、有5个10Ω的电阻并联,再和10Ω的电阻串联,总电阻是( C &nbsp;)Ω。 A &nbsp;8 B &nbsp;10 C &nbsp;12 D &nbsp;14 14、计算不对称三相电路视在功率的公式是( A &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 15、电路由( A &nbsp;)和开关四部分组成。 A &nbsp;电源、负载、连接导线 B &nbsp;发电机、电动机、母线 C &nbsp;发电机、负载、架空线路 D &nbsp;电动机、灯泡、连接导线 16、参考点也叫做零电位点,它是( &nbsp;A ) 。 A &nbsp;人为规定的 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;由参考方向决定的 C &nbsp;由电位的实际方向决定的 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;大地。 17、Y接时三相电源的公共点叫( A &nbsp;)。 A &nbsp;三相电源的中性点 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;三相电源的参考点 C &nbsp;三相电源的零电位点 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;三相电源的接地点 18、如题图1-2所示,A,B,C三个灯泡串联在直线电源上,电源端电压为U,开关S闭合后电灯都不亮,用电压表测量灯两端电压,结果是:、、则( &nbsp;C )。 A &nbsp; A灯开路 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; B灯开路 C &nbsp; C灯开路 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; B灯和C灯同时开路 19、电压的参考方向规定为( B &nbsp;)。 A 从低电位指向高电位 B &nbsp;从高电位指向低电位 C 注意选定 D &nbsp;从高电位指向大地 20、交流电的周期和频率( B &nbsp;)。 A 变化相同 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 互为倒数 C 单位相同 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 变化不同 21、正弦交流电的幅值就是( &nbsp;B )。 A 正弦交流电最大值的2倍 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 正弦交流电的最大值 C 正弦交流电波形正负振幅之和 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 正弦交流电最大值的倍 22、将交流电感元件的内阻r忽略不计时,其电路中的有功功率计算公式是( &nbsp;B )。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; D 23、交流电感元件电路中计算电感感抗的公式是( &nbsp;C )。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 24、单相交流电阻、电感 和电容串联电路中的无功功率计算公式是( A &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 25、一只“、”的电炉,每天工作4h,该电炉每天耗电( C &nbsp;)kWH。 A &nbsp;8 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp;4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;2 26、无论三相电路是Y接或△接,也无论对称与否,其总功率P为( B &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 27、金属导体的电阻,因此可以说( C &nbsp;)。 A 导体的电阻与它两端的电压成正比 B &nbsp;导体的电阻与通过它的电流成反比 C 电流强度与这段导体的电阻成反比 D &nbsp;电压大小与这段导体电阻成反比 28、在题图1-3所示电路中,当开关S断开后,则灯泡A将( C &nbsp;)。 A 较原来暗 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 与原来亮度一样 C 较原来亮 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 无法判断 29、将“12V,6W”的灯泡接入6V的电路,通过灯丝的实际电流是( &nbsp;D )A。 A &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp;0.5 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;0.25 30、在题图1-4所示电路中,当开关S闭合的瞬间( &nbsp;C )。 A &nbsp; A灯和B灯同时亮 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; A灯先亮,B灯后亮 C &nbsp; B灯先亮,A灯后亮 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; B灯不亮 31、在题图1-5所示电路中,已知,那么R2上的电压是 ( &nbsp;A )V。 A &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;3 C &nbsp;4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;6 32、在题图1-6所示电路中,在开关S断开瞬间电阻R两端电压的极性如图所示,则( A &nbsp;)。 A &nbsp; a、c;是同名端 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; b、c是同名端 C &nbsp;a、b是同名端 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;c、d是同名端 33、在正弦交流纯电感电路中,电压与电流的数量关系( B &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 34、在正弦交流纯电容电路中,电压与电流的数量关系是( D ) A &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 35、在纯电阻电路中,下列各式正确的为( B &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 36、在题图1-7中,当开关S断开时,电压为( A &nbsp;)V。 A &nbsp; 0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; 10 &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp;15 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;20 37、在题图1-7中,当开关S闭合时,电压为( A &nbsp;)V。 A &nbsp;0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;10 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp;20 &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;15 38、有一只内阻为0.15Ω,最大量程为1A的电流表,现给它并联一个0.05Ω的小电阻,则这只电流表的量程将扩大为( B &nbsp;)A。 A &nbsp;3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;8 39、两只额定电压相同的电阻,串联在适当的电压上,则额定功率较大的电阻( B &nbsp;)。 A &nbsp;发热量较大 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 发热量较小 C 与功率较小的电阻发热量相同 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D不能确定 40、在题图1-8所示电路中,已知, C是电容器,两端的电压是( A &nbsp;)V。 A &nbsp;0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp;4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;6 41、如题图1-9所示,是电源E的内阻,要输出功率最大,则( C &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 42、某电路处在短路状态时,外电路电阻R为零,故短路电流在R上压降( &nbsp;A )。 A 等于0 B 不等于0 C 等于电源电势 D 不能确定 43、金属导体的电阻随温度升高而增大,其主要原因是( A &nbsp;)。 A电阻率随温度升高而增大 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B 导体长度随温度升高而增大 C导体的截面积随温度升高而增大 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D不能确定 44、将220V的交流电压加到电阻值为22Ω的电阻器两端,则电阻器两端( A &nbsp;)。 A电压有效值为220V,流过的电流的有效值为10A &nbsp; &nbsp; &nbsp; B电压的最大值为220V,流过的电流的最大值为10A C电压的最大值为220V,流过的电流的有效值为10A &nbsp; &nbsp; D电压的有效值为220V,流过的电流的最大值为10A 45、正弦交流电压和电流的最大值分别为时,视在功率为( &nbsp;A )。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 46、两额定电压为220V的灯泡,若A灯的额定功率为100W,B灯的额定功率为40W,串联后接入电源电压为220V的电路中,此时两只灯泡的实际功率( &nbsp;C )。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D 不能确定 47、A点电位为65V,B点电位为35V,则( D &nbsp;)V。 A &nbsp;100 &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; 30 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp;0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;-30 48、在电容器的串联电路中,已知,则其两端电压为( C &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;不能确定 49、在题图1-10中,如果电灯灯丝烧断,则( B &nbsp;)。 A 电流表读数不变,电压表读数为0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B 电压表读数不变,电流表读数0 C 电流表和电压表读数都不变 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 电流表被烧坏 50、如题图1-11所示,AB两端等效电阻为( &nbsp;B )Ω。 A &nbsp; 1 B &nbsp; 201 C &nbsp; 1000 D &nbsp; 1200 51、题图1-12(a) 、(b)两个电路中电容的电容值均为C,两个电路的等效电容和的关系是( A &nbsp;)。 A &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; C &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;无法确定 52、题图1-13所示电压u和电流i的波形图中,指出u和i的相位关系是( A &nbsp;)。 A &nbsp;u超前 &nbsp; &nbsp; B &nbsp;u超前 C &nbsp;u超前 &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;i滞后 53、在题图1-14中指出和的相位关系是( &nbsp;B )。 A &nbsp;超前 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;超前 C 超前 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;超前 54、电路负载所消耗的电能与有功功率对成正比,并联电容器使电路功率因数提高后,负载所消耗的电能将( &nbsp;C )。 A &nbsp;增大 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;减少 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp;不变 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D 不能确定 55、对称的三相绕组,彼此应相差( C &nbsp;)电角度。 A &nbsp; 30o &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; &nbsp;60o &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp; 120o &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 180o 56、有一只内阻为0.1Ω、量程为10A的电流表,当它测得的电流是8A时,在电流表两端的电压降是( D &nbsp;)V。 A &nbsp; 1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; 0.1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp; 1.6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 0.8 57、电能的法定单位是( A &nbsp;) 。 A &nbsp; J和kWh &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; kWh和乏 &nbsp; &nbsp; &nbsp; &nbsp;C &nbsp; Wh和度 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; var 58、在三相四线制照明电路中,对于中性线上的电流,( &nbsp;B )。 A 由于每相的电流都要经过中性线,所以中性线上的电流最大,数值上等于三相电流之和 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 中性线上的电流等于三相电流的相量和,在数值上可能大于其中一相的电流 C 由于中性线的电压为零,所以根本不会有电流通过,因此中性线可比相线细一些 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 中性线上的电流等于线电流 59、磁电系电流表扩大量程时通常采用(B )的方法。 A 将固定线圈分段使用; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 在固定线圈上并联分流器; C 与电流互感器配合使用; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 与电压互感器配合使用。 60、交流电路测量和自动保护中,使用电流互感器的目的是(A ) A 既可扩大量程,又可降低测量及保护设备的绝缘等级; &nbsp; &nbsp; &nbsp;B 增加测量保护精度; C 为了扩大量程; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D 为了安全。 61、机电式(感应系)电能表可用于(B ) A 直流电路; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;交流电路; C 交直流两用; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D 主要用于交流电路。 62、测量交流低压50A以上大电流负载的电能,采用(C ) A 专门的大电流电能表; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 电能表并联分流电阻接入电路; C 电能表经电流互感器接入电路; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 两只电能表并联后接入电路。 63、当用万用表的R×1000欧姆档检查容量较大的电容器质量时,按R—C充电过程原理,下述论述中正确的是(B ) A 指针不动,说明电容器的质量好; &nbsp; B 指针有较大偏转,随后返回,接近于无穷大; C 指针有较大偏转,返回无穷大,说明电容器在测量过程中断路; D &nbsp;指针有较大偏转,说明电容器的质量好。 64、用绝缘电阻表测量电流互感器一次绕组对二次绕组及对地间的绝缘电阻值时,如( A),不予检定。 A&lt;5mω b=&quot;&quot; c=&quot;&quot;&gt;5MΩ D &nbsp;≥5MΩ 65、测量绝缘电阻使用的仪表是(B ) A &nbsp;接地电阻测试仪; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;绝缘电阻表; C 万用表; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 功率表。 66、我国规定的对电能表型号的表示方式的第一部分是(A ) A 类别代号; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 组别代号; C 设计序号; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 结构型式。 67、一只3×5(20) A,3×220/380V的有功电能表,其中5是指这只电能表的(A )。 A 基本电流; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 额定电流; C 长期允许的工作电流; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D允许的最大工作电流。 68、国产电能表的型号一般由以下两部分组成(C ) A 电压和电流; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 单相和三相; C 文字符号和数字符号; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 有功和无功 69、当三相三线电路的中性点直接接地时,宜采用(B )的有功电能表测量有功电能。 A 三相三线; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;三相四线 C 三相三线或三相四线; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;三相三线和三相四线。 70、如果一只电能表的型号为DTSD9型,这只表应该是一只(A ) A &nbsp;三相四线多功能电能表; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 三相预付费电能表; C 三相最大需量表 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D 三相三线复费率电能表。 71、电子式多功能电能表与机电一体式多功能电能表的主要区别是电能测量单元的(A ) A 测量原理 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B 结构 C 数据处理方法 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D 数据传送方法 72、现一般采用的直接接入式单相电能表接线时,应按照端子(C )的原则进行接线。 A &nbsp;1、2接电源,3、4接负载 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; 3、4接电源,1、2接负载 C &nbsp;1、3接电源,2、4接负载 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;2、4接电源,1、3接负载 73、电能表安装要牢固垂直,使表中心线向各方向的倾斜度(D ) A &nbsp;大于10° &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B 大于5° C &nbsp;大于1° &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D 不大于1° 74、采用钳形电流表测量电动机负载电流时,若单根相线电流值为IN 同时钳入三相导线,其测量的结果是( C ) A &nbsp;3IN B &nbsp; IN C &nbsp;0 D &nbsp;2IN 75、绝缘电阻表是专用仪表,用来测量电气设备供电线路的( C ) A &nbsp;耐压 B 接地电阻 C &nbsp;绝缘电阻 D 电流 76、测量工作电压为380V以下的电动机绕组绝缘电阻时应选(B &nbsp;)。 A &nbsp;500型万用表 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;500V绝缘电阻表 C &nbsp;1000V绝缘电阻表 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;2500V绝缘电阻表 77、绝缘电阻表输出的电压是(C &nbsp;)。 A &nbsp;直流电压 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;正弦波交流电压 C &nbsp;脉动直流电压 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;非正弦交流电压 78、对于新安装的和停用三个月以上的电动机和启动设备,应用500V绝缘电阻表测量其绝缘电阻。若绝缘电阻小于( A )MΩ,则必须进行烘干处理。 A &nbsp;0.5 B &nbsp;1 C &nbsp;2 D &nbsp;1.5 79、接地电阻测量仪是用于测量( D )的。 A &nbsp;小电阻 B &nbsp;中值电阻 C &nbsp;绝缘电阻 D &nbsp;接地电阻 80、测量直流电压时,正确接入电路的方法是( C )。 A &nbsp;和负载串联,“+”极端接高电位; &nbsp; &nbsp; &nbsp;B &nbsp;和负载并联,“+”极端接低电位; C &nbsp;和负载并联,“+”极端接高电位; &nbsp; &nbsp; &nbsp;D &nbsp;可以随便接。 81、用万能表测量电阻时,以指针的偏转处于( D )为最适宜。 A &nbsp;刻度范围内; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;靠近∞端的1/3范围内; C &nbsp;靠近端的1/3范围内; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;接近于中心刻度线(即欧姆中心值)。 82、仪表偏离工作条件产生的误差称为( D ) A &nbsp;基本误差 B &nbsp;相对误差 C &nbsp;偶然误差 D &nbsp;附加误差 83、已知绝对误差⊿,实际值为A,则相对误差为( C ) A &nbsp;⊿·A B &nbsp;⊿/A C (⊿/A)×100% D &nbsp;⊿/A% 84、绝缘电阻表因采用( B ),故在不带电时,指针随机停留在任意位置。 A &nbsp;功率表 B &nbsp;比率表 C &nbsp;有功表 D &nbsp;电压表 85、常用机电式电能表是( B )系列仪表。 A &nbsp;电磁 B 感应 C &nbsp;磁电 D 电动 86、绝缘电阻表应根据被测电气设备的(B )来选择。 A &nbsp;额定功率 B &nbsp;额定电压 C &nbsp;额定电阻 D &nbsp;额定电流 87、测量380V以下电器设备的绝缘电阻,应选用( &nbsp;B)V的绝缘电阻表。 A &nbsp;380 B &nbsp;500 C &nbsp;1000 D &nbsp;2500 88、用钳形电流表测量较小负载电流时,将被测线路绕2圈后夹入钳口,若钳形表读数为6A,则负载实际电流为( B )。 A &nbsp;2A B &nbsp; 3A C &nbsp;6A D &nbsp; 12A 89、一只电流表与一只变流比为600/5A的电流互感器配用,测量满载为600A的负载电流,当电流表读数为3A时,电路的实际电流为( C )A。 A &nbsp;3 B &nbsp; 120 C &nbsp;360 D &nbsp; 600 90、违反规定使用一线一地制照明,当用手拔接地线时触电应为( A )。 A &nbsp;单相触电 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;两相触电 C &nbsp;跨步电压触电 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;接触电压触电 91、在正常环境下( C )是人体电阻的平均值。 A &nbsp;0.5kΩ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; 1.0kΩ C &nbsp;1.7kΩ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 2.0kΩ 92、人体通过的电流值与通电时间的乘积,对人身的安全是一个界限,通常认为 ( C )mA为安全值。 A &nbsp;10 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;20 C &nbsp;30 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;40 93、巡线人员发现导线断落地面或悬吊空中时,应设法防止行人靠近断线地点( D )m以内。 A &nbsp;3 B &nbsp;5 C &nbsp;6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 8 94、在家庭进户线的电能表之后,安装动作电流( A )mA快速型剩余电流动作保护器。 A &nbsp;小于或等于30 B &nbsp; 40 C &nbsp; 50 D &nbsp;60 95、电力线路发生接地故障时,在接地点周围将产生( B )。 A &nbsp; 接地电压 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;跨步电压 C &nbsp; 短路电压 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;无电压 96、电工安全用具中,最基本的安全用具是( C )。 A &nbsp;安全帽、安全带、绝缘档板 &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; 绝缘鞋、绝缘手套、绝缘垫 C &nbsp;绝缘杆、绝缘手套、验电笔 &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp; 绝缘站台、警示牌 97、人身触电后,实施抢救的原则是切断电源,( C )。 A &nbsp;送医院 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;打强心针抢救 C &nbsp;就地抢救,准确实施触电急救法,坚持到底 &nbsp;D &nbsp;等医院来人抢救 98、保护接零系统中,插座的接地端子应( B )。 A &nbsp;与插座的工作零线端子相连接 &nbsp; &nbsp; &nbsp; B &nbsp; 和零干线直接连接 C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;和工作零线连接 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;&nbsp;和大地连接 99、( C )不属电工通用工具。 A &nbsp;试电笔 B &nbsp;剥线钳 C &nbsp;螺丝刀 D &nbsp;电工钢丝钳 100、人体接触产生剩余电流设备金属外壳时,所承受的电压是( C &nbsp;)。 A &nbsp;跨步电压 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;外壳对地电压 C &nbsp;接触电压 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;外壳对中性点电压 101、一般情况下,两相触电比单相触电后果( &nbsp;A )。 A &nbsp;严重得多 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;一样严重 C &nbsp;轻微得多 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;稍微轻些 102、人体触电伴随的高空坠落应该(B &nbsp; )。 A &nbsp;不属于触电事故 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;属于触电引起的二次事故 C &nbsp;属于机械事故 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;属于认为事故 103、人体距离电流入地点越近,承受的跨步电压( &nbsp;A )。 A &nbsp;越高 B &nbsp;越低 &nbsp; C &nbsp;为零 D &nbsp;一样 104、发现电力线断落时,室外人所处的位置距离导线的落地点应在( &nbsp;D )m以外。 A &nbsp;5 B &nbsp;6 C &nbsp;7 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;8 105、剩余电流动作保护器动作后,应迅速查明原因,( C &nbsp;)后,方能投运。 A &nbsp;更换设备 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;更换保护器 C &nbsp;排除故障 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;进行试验 106、一般来说,电击比电伤的伤害度( B &nbsp;)。 A &nbsp; 轻 B &nbsp; 重 C &nbsp; 一样 D &nbsp; 无可比性 107、三相电表应采用( A )连接 A &nbsp; 正相序 B &nbsp; 反相序 C &nbsp; 可以任意接 D &nbsp; 逆相序 108、有功电能表的计量单位为( D ) A &nbsp; kW B &nbsp; J C &nbsp;KVA D &nbsp; kWh 109、Ⅱ类电能计量装置中所用电压互感器不应低于(A &nbsp;)级。 A &nbsp;0.2 B &nbsp; 0.5 C &nbsp;1.0 D &nbsp;2.0 110、某型号单相电能表的电流规格为5(20)A,当此电能表工作在20A时,电能表( C ) A &nbsp;能长期工作但不能保证准确度 &nbsp; &nbsp; &nbsp; B &nbsp;能保证准确度,但不能长期工作 C &nbsp;能长期工作且能保证准确度 &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;以上都不对 111、为提高低负荷计量的准确性,10kV及以下电能计量装置原则上最适合选用过载(C )及以上的电能表 A &nbsp; 1倍 B &nbsp; 3倍 C &nbsp; 4倍 D &nbsp;10倍 112、三相三线有功电能表能准确测量(A &nbsp;)的有功电能 A &nbsp; 三相三线电路 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; 对称三相四线电路 C &nbsp;不完全对称三相电路 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;三相电路 113、当三相三线电路的中性点直接接地时,宜采用(B )的有功电能表测量有功电能。 A &nbsp; 三相三线 B &nbsp; 三相四线 C &nbsp; 三相三线或三相四线 D &nbsp; 三相三线和三相四线 114、直接接入式与经互感器接入式电能表的根本区别在于(C ) A &nbsp; 内部结构 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; 计量原理 C &nbsp; 接线端钮盒 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 内部接线 115、当单相电能表相线和零线互换接线时,用户采用一相一地的方法用电,电能表将( C ) A &nbsp;正确计量 B &nbsp;多计电量 C &nbsp;不计电量 D &nbsp;烧毁 116、在三相负荷平衡的情况下,对电能计量装置接线进行检查时,若两相电流的相量和值是单相电流值的倍,则说明有电流( B) A &nbsp; 移相 B &nbsp;接反 C &nbsp; 缺相 D &nbsp; 短路 117、为保证抄表工作的顺利进行,下列选项中不属于抄表前要作的是( D ) A &nbsp;掌握抄表日的排列顺序 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;合理设计抄表线路 C &nbsp;检查应配备的抄表工具 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;检查线路是否短路 118、电流互感器文字符号用( C )标志 A &nbsp; PA B &nbsp; PV C &nbsp;TA D &nbsp; TV 119、农村小型农副业用户的计量装置选用电流互感器的精度应为( B ) A &nbsp; 0.5级 B &nbsp; 0.5S级 C &nbsp;1.0级 D &nbsp; 2.0级 120、电能的法定单位是( A ) A &nbsp;J和kWh &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;kWh和度 C &nbsp;度和J &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;kW和J 121、使用电流互感器和电压互感器时,其二次绕组应分别(A )接入被测电路中 A &nbsp;串联 &nbsp;并联 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp; 并联 &nbsp;串联 C &nbsp;串联 &nbsp;串联 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 并联 &nbsp;并联 122、电压互感器文字符号用(D )标志 A &nbsp; PA B &nbsp; PV C &nbsp; TA D &nbsp;TV 123、对于直接接入电路中的单相电能表,其电压线圈的额定电压应为( D ) A &nbsp;100V &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;380V C &nbsp;与线路额定电压相同 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;220V 124、下列设备中,二次绕组比一次绕组少的是( B ) A &nbsp;电流互感器 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;电压互感器 C &nbsp;升压互感器 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;以上均不正确 125、用电量千瓦时(kWh)是( B &nbsp;) A &nbsp;用功率的单位 B &nbsp;电量的单位 C &nbsp;用电时间的单位 D &nbsp;电流的单位 126、关于电流互感器,下列说法正确的是(B &nbsp; ) A &nbsp;二次绕组可以开路 B &nbsp;二次绕组可以短路 C &nbsp;二次绕组不能接地 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;以上均可以 127、若将电能计量装置中的电流的电流互感器由200/5A变为300/5A,此时电能表将(A ) A &nbsp;变慢 B &nbsp;变快 C &nbsp;不变 D &nbsp;都有可能 128、用户单相用电设备总容量不足( B )的可采用低压220V供电,其计量方式采用单相计量方式。 A &nbsp;5kw B &nbsp;10kW C &nbsp;15kW D &nbsp;20kW 129、复费率电能表为电力部门实行(C &nbsp;)提供计量手段 A &nbsp;两部制电价 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;各种电价 C &nbsp;不同时段的分时电价 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;先付费后用电 130、某10kv用户接50/5电流互感器,若电能表读数为20kWh,则用户实际用电量为(B &nbsp; ) A &nbsp;200kWh &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;20000kWh C &nbsp;2000kWh &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;100000kWh 131、用户用电的设备容量在100kW或变压器容量在50kVA及以下的,一般应以(B &nbsp;)方式供电 A &nbsp;高压 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;低压三相四线 C &nbsp;专线 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;均可 132、低压三相用户,当用户最大负荷电流在(D )以上时宜采用电流互感器 A &nbsp;20A B &nbsp; 25A C &nbsp;40A D &nbsp;50A 133、( &nbsp;B )及以上用户应进行功率因数考核 A &nbsp;50kVA B &nbsp;100kVA C &nbsp;150kVA D &nbsp;200kVA 134、当采用电压连片的单相电能表相线和零线互换接线时,电能表的接线属于( C ) A &nbsp;错误接线 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;标准接线 C &nbsp;非标准的正确接线 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;烧毁 135、某一单相用户使用电流为5A,若将单相两根导线均放入钳形表表钳之内,则读数为( D ) A &nbsp;5A B &nbsp;10A C &nbsp;5 A D &nbsp;0A 136、对于高压供电用户,一般应在( &nbsp;A )计算 A 高压侧 B &nbsp; 低压侧 C 高低压侧 D &nbsp; 任意一侧 137、某低压单相用户负荷为8kW ,则(B &nbsp;)单相有功电能表合适 A &nbsp; 5(20)A B &nbsp;10(40)A C &nbsp;15(60)A D &nbsp;20(80)A 138、变压器容量在( C )及以上的用户应计量无功功率 A &nbsp; 2000kV B &nbsp;315kVA C &nbsp;100kVA D &nbsp;50kVA 139、由于电能表的相序接入变化,影响电能表的读数,这种影响称为(C &nbsp;) A &nbsp; 接线影响 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; 输入影响 C &nbsp;相序影响 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp; 负载影响 140、用三相两元件电能表计量三相四线制电路有功电能,将( D &nbsp;) A &nbsp;多计量 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; 少计量 C &nbsp;正确计量 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;不能确定多计或少计 141、中性点接地的三相四线低压线路,宜采用( B &nbsp;)计量 A &nbsp;三相三线电能表 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp; 三相四线电能表 C &nbsp;三相三线,三相四线电能表均可 D &nbsp; 以上均不对 142、用三只单相电能表测三相四线电路有功电能时,其电能应等于三只表的(B &nbsp;) A &nbsp;几何和 B &nbsp;代数和 C &nbsp;分数值 D &nbsp;平均值 143、在下列计算方式中,考核用户用电需要计入变压器损耗的是(B &nbsp;) A &nbsp; 高供高计 B &nbsp;高供低计 C &nbsp; 低供低计 D &nbsp;以上均要计入 144、三相有功电能表的电压接入,要求按(A &nbsp;) A &nbsp;正序接入 B &nbsp;负序接入 C &nbsp;零序接入 D &nbsp;顺时接入 145、负荷容量为315kVA以下的低压计费用户的电能计量装置属于( D )计量装置。 A &nbsp;I类 B &nbsp;Ⅱ类 C &nbsp;III类 D Ⅵ类 146、在带电的电流互感器二次回路上工作,可以( B ) A &nbsp;将互感器二次侧开路 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;用短路匝或短路片将二次回路短路 C &nbsp;将二次回路永久接地点断开 &nbsp; &nbsp;D &nbsp;在电能表和互感器二次回路间进行工作 147、电流互感器二次回路的连接导线,至少应不少于( B )mm2 A &nbsp;5 B &nbsp;4 C &nbsp;3 D &nbsp;2 148、电能计量用电压和电流互感器的二次导线最小截面积为( B )。 A &nbsp; 1.5mm2 、2.5mm2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; B &nbsp;2.5mm2 、4mm2 C &nbsp; 4mm2 、6mm2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D &nbsp;6mm2 、2mm2 149、计量二次回路可以采取的线型有( A ) A &nbsp;单股铜芯绝缘线 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B &nbsp;多股铜芯绝缘软线 C &nbsp;单股铝芯绝缘线 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;D &nbsp;多股铝芯绝缘线 150、互感器二次侧负载不应大于其额定负载,但也不宜低于其额定负载的( B) A &nbsp;10%</p><!--5mω-->
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