机械类笔试试题

    1. briefly describe (cutting), forming, coining and embossing in stamping process.

    2. ?

    3.  glass fiber to thermoplastic material?

    4. in contrast her 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. n criteria used in plastics catch/snap?

    8. e?

    ee笔试试题

    1. name 3 vehicle buses.

    2. name 2 possible sources of electromagnetic interference on electronics circuit a.

    3. th for 12mhz frequency signal is____

    4. name 2 important considerations for car radio performan -ce related to audio signal processing under multipath condition?

    5. nal strength to achieve 30db s/n for car radio?

    6. e frequency?

    7. for a system ulator loop instability?

    （1）equivalent series resistance(esr)

    （2）effective series inductance(esl)

    （3）capacitance value

    （4）dielectric material

    9. the s regulator is capable of:

    （1）higher po 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 follo thermal characteristics:

    package  rja（摄氏度/e to handle the po instructions:

    int a=5, b=7, c;

    c = a+++b;

    4.  declarations mean?

    （1）const int a;

    （2）int const a;

    （3）const int a;

    （4）int  const a;

    （5）int const  a const;

    5.  statements describe the use of the keyisters or variables. given an integer variable a, ments.

    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.  function return?

    char foo(void)

    {

    unsigned int a = 6;

    iht b = -20;

    char c;

    (a+b > 6) ? (c=1): (c=0);

    return c;

    }</p>

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