Any logic expression can be implemented using NAND gates
Indicate whether the statement is true or false
TRUE
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Sometimes called time and action charts, ____ are useful production tools for project planning.
A. Gantt charts B. flowcharts C. organizational charts D. Venn diagrams
Which type of engine-driven AC generator is commonly used as a standby system because they have a longer life and require less maintenance?
a. Diesel-powered b. LP gas-powered c. Liquid-cooled d. Air-cooled
The Orowan mechnaism, which explains the hardening effect of precipitate particles when the participates have grown to a size where they are no longer coherent with the matrix, is shown in Fig. 16.17. The strengthening arises from the fact that the disloactions must bow out between two neighboring precipitate particles. This bowing out is opposed by the line of tension of the dislocations. Ashby has deduced an equation giving the stress needed to dislocations under conditions conforming to the Orowan model. An equation giving this stress, which assumes that the particles are spherical and that the system involves iron containing carbon, may be found in Leslie, W.C., The Physical Metallurgy of Steels, McGraw Hill Book Company, New York, 1980, p.198. It is:
To correct for drift between the sending and receiving oscillators, asynchronous communication systems _______
A) use a third system oscillator to establish a reference frequency B) require periodic calibration by authorized service personnel C) coordinate transmissions with a recognized NIST time signal D) use the start bit of each data packet to resynchronize the oscillators