173[1].delphi的笔试题.txt

总结了一些软硬件方面的笔试面试题

DELPHI的笔试题 
shury 发表于 2004-12-4 17:55:00 

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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.