Describe the different types of grille outlets.
What will be an ideal response?
A grille is a rectangular opening with vanes that direct the airstream as it leaves an outlet. Adjustable grilles have adjustable vertical or horizontal vanes that deflect airstream in a horizontal or vertical direction. Some types have two sets of vanes at right angles to each other. Fixed bar grilles have vanes that cannot be moved. Variable area grilles (also called registers) have dampers that can vary the size of an outlet, thus varying the air that passes through. Stamped grilles are simply a flat sheet with openings that permit air to pass with no control of direction or volume.
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Suppose the propagation delay is ?, SIFS is ?, DIFS is 3?, and RTS and CTS are 5?, respectively, for CSMA/CA with RTS/CTS.
(a) What is the earliest time for the receiver to send the CTS message? (b) If the data packet is 100? long, what is the shortest time for the receiver to send the ACK signal? (c) Explain why SIFS is kept smaller than DIFS. (d) Can you make SIFS = 0?
Pickling preserves food because bacteria cannot survive in the liquid due to the high _____ content
a. oxygen c. moisture b. acid d. heat
A dimension line is drawn from one extension line to the next.
Answer the following statement true (T) or false (F)
What controls the heating elements in most electric furnaces?
A) Contactors B) Heat relays C) Sequencers D) Thermistors