Lead-acid batteries may contain what gases?
A) Hydrogen B) Oxygen C) Both A and B D) Neither A nor B
C
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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?
After all lights and switches are wired, the ____________________ should be tested before turning on
the circuit breaker or inserting the fuse.
Fill in the blank(s) with the appropriate word(s).Which of the following are facilities decisions?
a. Should a firm have one or two large plants or several smaller plants? b. Should a firm make all its components or buy some from others? c. Where should facilities be located? d. All of these are facilities decisions. e. None of these are facilities decisions.
The nameplate of a squirrel cage four-pole induction motor has the following information: 25 hp, 220 V, three-phase, 60 Hz, 830 r/min, 64-A line current. If the motor draws 20,800 W when operating at full load, calculate
a. Slip. b. Percent regulation if the no-load speed is 895 r/min. c. Power factor. d. Torque. e. Efficiency.