An application requires the support of an axial load of 100 kips with a round rod without exceeding the yield strength of the material. Assume the current cost per pound for round stock is given in the table below for several materials that are being considered. Material properties are available in Tables A–5, A–20, A–21, and A–24. Select one of the materials for each of the following additional design goals.
(a) Minimize diameter.
(b) Minimize weight.
(c) Minimize cost.
(d) Minimize axial deflection.
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The unit of measure for the coefficient of thermal expansion (a) is
A) feet or meters. B) °C-1 or °F-1. C) watts or joules. D) °C or °F. E) none of the above.
Answer the following statement(s) true (T) or false (F)
1. Three-wire motor control circuits have three control circuit wires between the motor starter and the control device(s). 2. Permanent contact control devices are called-out as either normally open or normally closed. 3. Once the motor starter contactor is energized and closes the holding contacts, the holding contacts provide a redundant electrical path around the normally open Start pushbutton contacts, to keep the contactor control coil energized. 4. The normally closed Stop pushbutton is wired as the third control component in the ladder rung, so that it has master control over the entire rung. 5. Once the motor starter contactor control coil is energized, and being held energized by the holding contacts, pressing the normally closed Stop pushbutton will de-energize the control coil; causing the contactor holding contacts to open.
At the normal service interval for an oil change, the technician notices the oil level reads just below the normal level on the dipstick before beginning to drain the oil. Technician A says that all engines will consume some amount of oil within the normal service interval. Technician B says that the technician should check any TSBs related to oil consumption and inform the customer. Who is correct?
A. A only B. B only C. Both A and B D. Neither A nor B
The most common fan used for moving air through ductwork in residential air conditioning is
A) Forward curved centrifugal B) Backward curved centrifugal C) Vane axial D) Propeller