三、有一 6kVA,3000V/200V,60Hz 之變壓器,二次換算為一次 的電阻 75Ω,二次換算為一次的電抗是 45Ω,此變壓器之負 載超前功率因數為 0.8,則 (1)一次額定電流 (5 分);(2)百分 比電阻壓降(5 分);(3)百分比電抗壓降(5 分);(4)電壓調整率 (5 分)。
23. Let A ∈ and x ∈ . Which of the following statements are true?
(A) If A is singular, then O is an eigenvalue of A.
(B) A and share the same eigenvalues and eigenvectors.
(C) If A is diagonalizable, then A has n distinct eigenvalues.
(D) Suppose that A is nonsingular. The condition Ax = Ix implies .
(E) Supposc that all the eigenvalues of A are real and positive. Then we have > 0.