A submarine driveshaft was made of epoxy and carbon fibers by filament winding. Indicate two reasons why composites have unique and excellent properties for this application. The part was cured in an oven at 250ºF (120ºC). On close examination, the shaft was found to spin irregularly and to cause vibrations. Identify four possible causes of this problem and four possible solutions
What will be an ideal response?
Two advantages: an anisotropic material, easier to design a part in composites that will withstand the torsional forces placed upon it.
Four possible causes: unbalanced fiber placement, uneven weight distribution, inadequate strength for the forces applied, insufficient material
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Answer the following statement(s) true (T) or false (F)
1. The triac is a PNPN junction connected in series with an NPNP junction. 2. The triac has only two states of operation, on or off. 3. The triac is used as the input of many solid-state relays. 4. The triac can be used to control an AC voltage. 5. The triac, like the SCR, must be phase shifted if complete voltage control is to be obtained.
The A horizons are more apt to be cultivated than the E horizons
Indicate whether the statement is true or false
A good technique to make sure that the customer realizes that you're listening and understand what they are saying is _______
A) Active listening B) Empathizing with their situation C) Ask checking questions D) All of the above
The thermistor __________ when the temperature to which it is exposed varies.
A. resistance changes B. produces different voltages