46家公司的笔试题目汇总

46家公司的笔试题目汇总,标签：面试常见问题,面试的问题,http://www.qz26.com
　　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
　　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.
　　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:

上一页  [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]  下一页