【单选题】【消耗次数:1】
交流铁心线圈,当线圈匝数N增加一倍,则磁通F将
增大
减小
不变
以上都不正确
参考答案:
复制
纠错
相关题目
【单选题】 二极管导通后,当流过它的电流增加一倍时,它两端的电压将( )。
①  增加一倍
②  略有增加
③  增加一倍以上
【单选题】 细长压杆,若其长度系数增加一倍,则( )。
①  Pcr增为原来的四分之一倍
②  Pcr增加一倍
③  Pcr为原来的二分之一倍
④  Pcr增加到原来的4倍
【单选题】 自由落体冲击时,当冲击物重量G增加一倍时,若其它条件不变,则被冲击物内的动应力()
①  不变
②  增加—倍
③  增加不足—倍
④  增加—倍以上
【单选题】 摩尔定律指出,当价格不变时,集成电路上可容纳的晶体管数目,约每隔()便会增加一倍,性能也将提升一倍。
①  A.6个月
②  B.12个月
③  C.18个月
④  D.24个月
【判断题】 细长压杆其他条件不变,只将长度增加一倍,则压杆的临界应力为原来的4倍。
①  正确
②  错误
【单选题】 矩形截面梁当横截面的高度增加一倍、宽度减小一半时,从正应力强度考虑,该梁的承载能力的变化为( )
①  不变
②  增大一倍
③  减小一半
④  增大三倍
【单选题】 一圆截面轴向拉压杆,若其直径增加一倍,则抗拉()。
①  强度和刚度分别是原来的2倍、4倍
②  强度和刚度分别是原来的4倍、2倍
③  强度和刚度均是原来的2倍
④  强度和刚度均是原来的4倍
【判断题】 其他条件不变,若作用在球轴承上的当量动载荷增加一倍,则该轴承的基本额定寿命将降至原来的一半。()
①  正确
②  错误
【单选题】 空气阻力与车速的平方成正比,车速增加一倍,则空气阻力是原值的_________。
①  一倍
②  二倍
③  四倍
④  八倍
【单选题】 超静定结构支座移动时,如果刚度增大一倍则( )。
①  内力也增大一倍、而位移不变
②  内力也缩小一倍、而位移不变
③  内力缩小一倍、位移也缩小一倍
④  内力和位移都不变
随机题目
【单选题】 If the building project __________ by the end of this month is delayed, the construction company will be fine@@
①  being completed
②  is completed
③  to be completed
④  completed
【单选题】 Between 1974 and 1997, the number of overseas vistors expanded_______27%.
①  by
②  for
③  to
④  in
【单选题】 That man alone over there – who is he?
①  He is a student
②  He is Doctor Took
③  A driver, I suppose
④  He’s drunk
【单选题】 Monday Tuesday is OK. I will be free then.
①  Either;or
②  Neither;nor
③  So; that
④  Both; and
【单选题】 Jean did not have time to go to the concert last night because she was busy __________ for her examination.
①  to prepare
②  to be prepared
③  preparing
④  being prepared
【单选题】 The adviser recommended that Mary _____ the training program as soon as possible.
①  started
②  starts
③  start
④  would start
【单选题】 The computer doesn’t work well, so something _________ wrong.
①  can have gone
②  should have gone
③  must have gone
④  ought to have gone
【单选题】 He made a mistake, but then he corrected the situation it got worse.
①  until
②  when
③  before
④  as
【单选题】 Please help yourself to the fish.
①  Thanks, but fish doesn’t agree with me
②  Sorry, I can’t help
③  I don’t like fish
④  No, I can’t
【单选题】 The reason _________ I am writing this letter is to tell you about the meeting on Saturday.
①  because
②  why
③  for
④  as