電磁兼容試卷英文b卷

1、南京師范大學(xué)2008-2009學(xué)年 第一學(xué)期 2006年級電磁兼容基礎(chǔ)課程期末試卷(B)答案班 級： 任課教師： 學(xué) 號： 姓 名： 題號一二三四五六七總分得分得分I. Questions and Answers（10 x 3= 30）1、What are the types of channel for EMI noise coupling? Please describe them simply.Conductive EMIRadioactive EMI得分2、What does electromagnetic compatibility (EMC) mean ?The capabilit

2、y of electrical and electronic systems, equipment, and devices to operate in their intended electromagnetic environment within a defined margin of safety, and at design levels or performance, without suffering or causing unacceptable degradation as a result of electromagnetic interference.得分3、Please

3、 give some main methods for EMI noise suppression. Balancing, Filtering, Isolation, Separation and orientation Circuit impedance level control, Cable design, Cancellation techniques得分得分II. Fill in the blanks with correct answer（8 x 6 = 48）1. The main reasons for electromagnetic interference (EMI) is

4、 _C_ANoise source, receiver and coupling channelB. System and circuit layout C. Power and frequency of system 2. In EMC regulations, what country does “FCC Part 15” belong to? _B_A. European standardB. USA standardC. Chinese standardD. International standard 3. As seen in figure 1, the main reason t

5、hat decreases the noise voltage Vn on conductor 2 generated by conductor 1 after conductor 2 being shielded is _B_A. The coupling capacitance C12 between conductor 1 and conductor 2 is decreasedB. The coupling capacitance C1S between conductor 1 and the shield is decreasedC. The coupling capacitance

6、 C2G between conductor 2 and the ground is decreased4. For signal grounding, when frequency is less than 1MHz, usually _A_ is adopted. When frequency is large than 10MHz, usually _B_ is adopted.A. Single-point groundingB. Multi-point groundingC. Hybrid grounding5. The main noise source in grounding

7、system comes from _ B_A. The ground potential difference in ground loop when multi-point groundingB. The noise interference caused by capacitive couplingC. The noise interference caused by inductive coupling6. As seen in figure 3 for conductive EMI model, A. The common-mode interference current is _Ib_B. The differential-mode interference current is _Ia_C. The safety grounding current