Delphi（英）.doc

Delphi笔试题目
　　机械类笔试试题
　　1. Briefly describe what is blanking(cutting), forming, coining and embossing in stamping process.
　　2. What is metal clading?
　　3. What is the purpose of adding glass fiber to thermoplastic material?
　　4. In contrast with metal and thermoplastic material,which has a higher coefficient of thermal expansion(CTE).
　　5. The most suitable material for a integral hinge design (typical plastic thickness=0.25 to 0.5mm at hinge)
　　6. Can a bending load makes both compressive and tensile stress in a member?
　　7. What is the design criteria used in plastics catch/snap?
　　8. What is FEA?
　　9. Why is natural frequency important in vibration analysis?
　　10. What is the deflection equation of a cantilever beam fixed at one edge?
　　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 Coefficient 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 packages.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 requirement 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 static?
　　（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 within that module
　　（3）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 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 62A5H.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 size) to divide a number by 4 in assembly language
　　18. what value is stored in m in the following assembly language code fragment 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?
　　#define a 365*24*60*60
　　20. Using the #define statement, how would you declare a manifest constant that returns the number of seconds in a year? Disregard leap years in your answer.
　　21. Interrupts are an important part of embedded systems. Consequently, many compiler vendors offer an extension to standard C to support interrupts. Typically, the keyword is __interrupt. The following routine (ISR). Point out problems in the code.
　　__interrupt double compute_area (double radius)
　　{
　　 double area = PI * radius * radius;
　　 printf(“/nArea = %f”, area);
　　 return area;
　　}