德尔福软件类笔试题

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德尔福软件类笔试题

　　在学习、工作中，许多人都需要跟试题打交道，借助试题可以检测考试者对某方面知识或技能的掌握程度。大家知道什么样的试题才是规范的吗？下面是小编帮大家整理的德尔福软件类笔试题，仅供参考，希望能够帮助到大家。

德尔福软件类笔试题

　　德尔福软件类笔试题 1

　　１．How do you code an infinite loop in C?

　　2. Volatile：

　　a) What does the keyword volatile mean? Give an example

　　b) Can a parameter be both const and volatile? Give an example

　　c) 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?

　　a) const int a;

　　b) int const a;

　　c) const int *a;

　　d) int * const a;

　　e) int const * a const;

　　5. Which of the following statements describe the use of the keyword　static?

　　a) Within the body of a function: A static variable maintains its value　between function revocations

　　b) Within a module: A static variable is accessible by all functions　within that module

　　c) Within a module: A static function can only be called by other　functions within that module

　　6. Embedded systems always require the user to manipulate bits in　registers 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 both　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 values are printed when the following C program is executed?

　　int i = 8;

　　void main(void)

　　(

　　9. 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);

　　}

　　10. What will the following C code do?

　　int *ptr;

　　ptr =(int *)Ox67a9;

　　ptr = Oxaa55;

　　德尔福软件类笔试题 2

　　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 performance related to audiosignal 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 Coefficient and 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 thermal 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 requirement without a heat sink and why.

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