065.2003年10月20日delphi_txt.txt

总结了一些软硬件方面的笔试面试题

2003年10月20日DELPHI的笔试题ZZ 
shury 发表于 2004-12-6 14:08:00 

德尔福的笔试试题（20日19：45，成电）

德尔福集团是全球最大的汽车系统和零部件生产制造商, 为客户提供品种齐全的汽车
系统, 零部件和模块。今天成电的就业办老师介绍说，德尔福是汽车界的华为，从来不在
媒体上打广告。
 
大家看看从美国空运过来的笔试题目
 
1、Name 3 Vehicle Buses.
 
2、Name 2 possible sources of Electromagnetic interference on Electronics Circ
uit ASM.
 
3、Wavelength for 12MHz frequency signal is____
 
4、Name 2 important considerations for car radio performance related to audio
signal processing under multipath condition?
 
5、What is the typical FM receiver RF signal strength to achieve 30dB S/N for
car radio?


 
6、When a radio is tuned to 98.1 MHz & with a LO of 108.8 MHz, what is the ima
ge frequency?
 
7、For a system with a matched impedance, what is the Reflection Coefficient a
nd SWR?
 
8、Which property of the output capacitor is the primary cause of Low Drop Out
(LDO) regulator loop instability?
  a) Equivalent series resistance(ESR)
  b) Effective series inductance(ESL)
  c) Capacitance value
  d) Dielectric material
 
9、The switching regulator is capable of:
  a) Higher power conversion efficiency
  b) Providing an output voltage that is higher than the input
  c) Generating an output boltage oppsite in polarity to the input
  d) All of the above
 
10、A linear regulator op*(没抄清楚)
  Vin(max)=10v,Vout(min)=4.8v,Iout(max)=2.5mA,Iq(max)=2.5mA,Ta(max)=8.5摄氏度，


  The regulator is available in 3 packages.Each package has the following ther
mal characteristics:
Package            Rja(摄食度/W)           Rjc(摄食度/W)
TO220                 50                        35
SO14                  125                       30
D1P8                  100                       52
    Choose the most suitable package to handle the power dissipation requireme
nt without a heat sink and why.