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4 A mode of communications in which either party can hear while talking, thus allowing one party to instantly interrupt the other at any time, is called (a) half simplex (b) full simplex (c) half duplex (d) full duplex (e) nothing, because there is no such mode 5 An FM stereo tuner generally covers a frequency range of (a) 535 kHz to 1605 kHz (b) 88 MHz to 108 MHz (c) 3 MHz to 30 MHz (d) 9 kHz to 300 MHz (e) 144 MHz to 148 MHz 6 Suppose an antenna has a radiation resistance of 35 and a loss resistance of 15 What is the efficiency of the antenna (a) 20 percent (b) 30 percent (c) 43 percent (d) 70 percent (e) Impossible to calculate from this information 7 The peak power output from a multicavity Klystron (a) can be much greater than the average power output (b) can be slightly greater than the average power output (c) is about the same as the average power output (d) is slightly less than the average power output (e) is much less than the average power output 8 To which of the following does the term platter apply (a) An individual disk in a hard drive (b) An individual disk in CD-R media (c) An individual disk in CD-RW media (d) An individual disk in flash memory (e) An individual disk in RAM 9 Why can signals in the so-called shortwave band sometimes propagate for thousands of kilometers without the need for satellites, repeaters, or any other infrastructure (a) Because EM waves at these frequencies are often returned to the earth by the ionosphere (b) Because waves at these frequencies can propagate through the ground or the ocean as electric currents

I ve never found a set-based approach to finding a good enough solution for the bin-packing problem. But I ve found set-based code that finds the perfect solution. This code was originally posted by John Gilson; I ve corrected and optimized this code and then published it to my blog (http://sqlblog.com/blogs/hugo_kornelis/archive/ 2008/10/27/bin-packing-part-4-the-set-based-disaster.aspx), but it s too large to reproduce here. There s no reason to, either, because this code can never be used in practice not only because it couples already-bad performance with the ugliest exponential growth curve I ve ever seen, but also because it requires extra columns in intermediate result sets and many extra lines of code as the bin size and the number of packages increases, such that for real-world problems, you d need millions of lines of code (and a version of SQL Server that allows more than 4,096 columns per SELECT statement). And then you ll still get execution times measured in days, if not years.

You can use iCal to run a script for you at a particular time even if iCal itself isn t running at the time

You probably know, or have read, that index fragmentation is bad for the performance of large queries. In particular, logical scan fragmentation can have a detrimental impact on the performance of queries that are processed with index ordered scans. Why The most common explanation is that when logical order doesn t match the physical order, SQL Server has to do more work in following the index page chain. Instead of trying to understand how SQL Server navigates through logical scan fragmentation internally, you can gain a solid understanding of its performance impact by looking at the disk performance counters more specifically, Avg. Disk Bytes/Read and Disk Read Bytes/sec. Let s again use the script in listing 1. To introduce logical scan fragmentation, first remove the CREATE INDEX statement from the script, and then insert the following SQL statement immediately after the test table is created and before the test table is populated with data:

(c) Because EM waves at these frequencies are reflected back to the earth by the moon (d) Because EM waves at these frequencies propagate along the boundary between the troposphere and the stratosphere (e) Forget it! Signals in the shortwave band cannot propagate beyond a line of sight without satellites, repeaters, or other human-made systems 10 What is the purpose of the filament in a vacuum tube (a) It prevents secondary electrons from causing excessive screen grid current (b) It causes holes to flow more easily in the collector (c) It heats the cathode, thereby increasing the electron emission (d) It glows, making the tube easy to locate when servicing is necessary (e) Forget it! Vacuum tubes do not have filaments 11 Figure Test4-1 is a schematic diagram of

CREATE CLUSTERED INDEX cix_test ON test(c2);