34.透入深度公式何者正確？
(A) δ =
(B) δ =
(C) δ =
(D) δ =

35.在一般應用上，只考慮導電率之影響，若待測金屬溫度上升時，則其透入深度 (A)不變 (B)減少 (C)增加 (D)不一定

36.對於旋轉式線圈，下列敘述，何者為真？ (A)它是屬於表面線圈 (B)它是屬於內繞線圈 (C)它是屬於外繞線圈 (D)以上皆有可能

37.在工件下之某一缺陷，以下敘述，何者為真？ (A)檢測頻率增加時，相位角增加 (B)檢測頻率增加時，相位角減小 (C)檢測頻率增加一倍時，相位角增加一倍 (D)以上皆非

複選題38.關於表面與內繞探頭之敘述，下列何者為真？ (A)表面探頭可檢出一般之腐蝕缺陷 (B)內繞探頭可檢出圈向之缺陷 (C)內繞探頭無法檢出腐蝕缺陷 (D)以上皆對

39.利用主線圈及次線圈之圈數不同來改變交流電電壓之變壓器，是利用？ (A)集膚效應 (B) 皮爾定律 (C)繞線原理 (D) 法拉第定律

40.調整以下那個儀器操作鈕，可改變離距與導電率曲線之夾角值？ (A)相位鈕 (B)離距鈕 (C)導電率鈕 (D)頻率鈕

複選題十五. Consider the famous hat problemn. Suppose that n pcople throw their hats in a box and n each picks one hat at random. (Each hat can be picked by only one person, and cach assi of hats to persons is equally likely) Let X be a random variable that ropresents the number of people that get back their own hat. Which of the following statemnents is/are true? (A) When n =3, P(X =3)= (B) When n = 3, P(X = 1)= (C) When n = 4, P(X = 3) = 0. (D) When n = 4, E[X] = 2. (E) When n = 5, E[X] = 1.

複選題十六. Consider the famous hat problem as in the previous problem. Let X, be a random variable that takes value 1 if the ith person selects his/her own hat, and takes value O otherwise. Let cov(Y, Z) = [Y . Z] -E[Y] ㆍE[Z] be the covariance of two random variables Y and 2. Which of the following statements is/are true? (A) When n = 4, cov(X4, X4) is .(B)When n = 4,cov(X1,X2)=(C) When n = 4, va=2. (D) When n = 4, Xi and Xz are statistically independent. (E) For any two random variables Y and Z, cov(Y, Z) ≥0.

X and Y are independent continuous random variables with probability density functions (PDFs) shown below. What is the probability of P(-1

15. (5%) The random variables X1, X2,X3 have the joint Gaussian pdf: What is the marginal Goint) pdf of Xi and X3? (A) 0. (B) (C) (D)(E) None of the above. 

96年 - 96財團法人中華民國非破壞檢測協會第二次非破壞檢測人員資格考試_初級_普通科 :渦電流檢測#107949