In which of the following fields do engineers work?
a. Design
b. Sales
c. Technical support
d. Maintenance
e. Customer service
f. All of the above
f. All of the above
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A broadband service company borrowed $2 million for new equipment and repaid the loan in amounts of $200,000 in years 1 and 2 plus a lump-sum amount of $2.2 million at the end of year 3. What was the interest rate on the loan?
What will be an ideal response?
____________________ skills are often gained when a student takes on an active role in a club or organization such as FFA or PAS.
Fill in the blank(s) with the appropriate word(s).
Pumps for hydronic heating systems are usually
A) centrifugal pumps B) diaphragm pumps C) gear pumps D) piston pumps
The electrodynamic shaker shown in Figure P18.49 is commonly used as a vibration tester. A constant current is used to generate a magnetic field in which the armature coil of length l is immersed. The shaker platform with mass m is mounted in the fixed structure by way of a spring with stiffness k. The platform is rigidly attached to the armature coil, which slides on the fixed structure thanks to frictionless bearings.
a. Neglecting iron reluctance, determine the reluctance of the fixed structure, and hence compute the strength of the magnetic flux density B in which the armature coil is immersed.
b. Knowing B, determine the dynamic equations of motion of the shaker, assuming that the moving coil has resistance R and inductance L. c. Derive the transfer function and frequency response function of the shaker mass velocity in response to the input voltage VS .
