46家公司的笔试题目汇总

46家公司的笔试题目汇总,标签：公务员面试题,http://www.56qiuzhi.com
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　　EE笔试试题
　　1. Name 3 Vehicle Buses.
　　2. Name 2 possible sources of Electromagnetic interference on Electronics
Circuit ASM.
　　3. Wavelength for 12MHz frequency signal is____
　　4. Name 2 important considerations for car radio performan -ce 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
image frequency?
　　7. For a system with a matched impedance, what is the Reflection Coefficie
nt and SWR?
　　8. Which property of the output capacitor is the primary cause of Low Drop
Out(LDO) regulator loop instability?
　　（1）Equivalent series resistance(ESR)
　　（2）Effective series inductance(ESL)
　　（3）Capacitance value
　　（4）Dielectric material
　　9. The switching regulator is capable of:
　　（1）Higher power conversion efficiency
　　（2）Providing an output voltage that is higher than the input
　　（3）Generating an output boltage oppsite in polarity to the input
　　（4）All of the above
　　10. A linear regulator op 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 pac
kages.Each package has the following thermal characteristics:
　　Package Rja（摄氏度/W） Rjc（摄氏度/W）
　　SO14 125 30
　　D1P8 100 52
　　Choose the most suitable package to handle the power dissipation requireme
nt without a heat sink and why.
　　软件笔试题
　　1. How do you code an infinite loop in C?
　　2. Volatile:
　　（1）What does the keyword volatile mean? Give an example
　　（2）Can a parameter be both const and volatile? Give an example
　　（3）Can a pointer be volatile? Give an example www.56qiuzhi.com
　　3. What are the values of a, b, and c after the following instructions:
　　int a=5, b=7, c;
　　c = a+++b;
　　4. What do the following declarations mean?
　　（1）const int a;
　　（2）int const a;
　　（3）const int *a;
　　（4）int * const a;
　　（5）int const * a const;
　　5. Which of the following statements describe the use of the keyword stati
c?
　　（1）Within the body of a function: A static variable maintains its value
between function revocations
　　（2）Within a module: A static variable is accessible by all functions wit
hin that module
　　（3）Within a module: A static function can only be called by other functi
ons within that module
　　6. Embedded systems always require the user to manipulate bits in register
s or variables. Given an integer variable a, write two code fragments.
　　The first should set bit 5 of a. The second shnuld clear bit 5 of a. In bo
th cases, the remaining bits should be unmodified. 自我介绍演讲稿
　　7. What does the following function return?
　　char foo(void)
　　{
　　 unsigned int a = 6;
　　 iht b = -20;
　　 char c;
　　 (a+b > 6) ? (c=1): (c=0);
　　 return c;
　　}
　　8. What will be the output of the following C code?
　　main()
　　{
　　 int k, num= 30;
　　 k =(num > 5 ? (num <=10 ? 100:200): 500);
　　 printf(“%d”, k);
　　}
　　9. What will the following C code do?
　　int *ptr;
　　ptr =(int *)Ox67a9;
　　*ptr = Oxaa55;
　　10. What will be the output of the follow C code?
　　#define product(x) (x*x)
　　main()
　　{
　　 int i = 3, j, k;
　　 j = product(i++);
　　 k = product(++i);
　　 printf(“%d %d”,j,k);
　　}
　　11. Simplify the following Boolean expression
　　!((i ==12) || (j > 15))
　　12. How many flip-flop circuits are needed to divide by 16?
　　13. Provides 3 properties that make an OS, a RTOS?
　　14. What is pre-emption?
　　15. Assume the BC register value is 8538H, and the DE register value is 62
A5H.Find the value of register BC after the following assembly operations:
　　MOV A,C
　　SUB E
　　MOV C,A
　　MOV A,B
　　SBB D
　　MOV B,A
　　16. In the Assembly code shown below
　　LOOP: MVI C,78H
　　 DCR C
　　 JNZ LOOP
　　 HLT
　　How many times is the DCR C Operation executed?
　　17. Describe the most efficient way (in term of execution time and code si
ze) to divide a number by 4 in assembly language
　　18. what value is stored in m in the following assembly language code frag
ment if n=7?
　　 LDAA #n
　　LABEL1: CMPA #5
　　 BHI L3
　　 BEQ L2
　　 DECA
　　 BRA L1
　　LABEL2: CLRA
　　LABEL3: STAA #m
　　19. What is the state of a process if a resource is not available? www.56qiuzhi.com
　　#define a 365*24*60*60

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