Why are pig heart valves superior to mechanical valves when replacing faulty human heart valves?
What will be an ideal response?
Because mechanical valves tend to accumulate residue from the flow of blood, they tend to stick. When they do, the results can be fatal. Pig hearts accumulate less residue, because they come from living, functioning animals.
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Part of the manufacturing cost of plastics is the cost of "special fixtures" which can be used to aid in machining with functions such as ____. ?
A. ?removing flash B. ?removing molded parts C. ?drilling jigs D. ?holding parts for cooling
The components marked 2 in Figure 1 are _____.
a. overload contacts
b. reset terminals
c. load terminals
d. melting-alloy heater assemblies
The modern annual production per laying hen is _____ eggs
a. 112 c. 315 b. 232 d. 480
An on/off start-up signal governs the compressor motor of a large commercial air conditioning unit. In general, the start-up signal should be on whenever the output of a temperature sensor S exceeds a reference temperature. However, you are asked to limit the compressor start-ups to certain hours of the day and also enable service technicians to start up or shut down the compressor through a manual override. A time-of-day indicator D is available with on/off outputs, as is a manual override switch M. A separate timer T prohibits a compressor start-up within 10 min of a previous shutdown. Design a logic diagram that incorporates the state of all four devices (S, D, M, and T ) and produces the correct on/off condition for the motor start-up.
What will be an ideal response?