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17 If a fuse blows, and it is replaced with one having a lower current rating, there is a good chance that (a) the power supply will be severely damaged (b) the diodes will not rectify (c) the fuse will blow out right away (d) transient suppressors won t work 18 Suppose you see a fuse with nothing but a straight wire inside You can assume that this fuse (a) is a slow-blow type (b) is a quick-break type (c) has a low current rating (d) has a high current rating 19 In order to minimize the risk of diode destruction as a result of surge currents that can occur when a power supply is first switched on, which of the following techniques can be useful (a) Connecting multiple diodes in parallel, with low-value resistors in series with each diode (b) Connecting multiple diodes in parallel, with low-value capacitors in series with each diode (c) Connecting multiple diodes in series, with low-value chokes across each diode (d) Connecting multiple diodes in series, with low-value resistors across each diode 20 To repair a damaged power supply with which you are not completely familiar, you should (a) install bleeder resistors before beginning your work (b) remove the fuse before beginning your work (c) leave it alone and have a professional work on it (d) short out all the diodes before beginning your work

environments. To use the managed ADO.NET data provider, you need to add a reference to the System.Data.SqlServerCe.dll assembly and make use of the classes within the System.Data.SqlServerCe namespace. The developer experience is similar to using the standard System.Data.SqlClient namespace for SQL Server 2008. The main difference is that instead of a Sql prefix, the ADO.NET data provider classes use a SqlCe prefix. As well as standard ADO.NET data provider functionality, the SQL Server Compact Edition provider includes a number of extensions that can potentially provide more efficient access to data. These features tend to make up for the lack of views, triggers, and stored procedures. For example, listing 1 demonstrates how the query processor can be bypassed completely to more efficiently implement a select * from customers where cust_name like 'F%' style query.

When you need to perform date and time arithmetic, the strings are about as much use as a cheerful grin in an earthquake Instead, use the integer numbers provided by the day, year, time, hours, minutes, and seconds properties of the date object For example, the following statements use the year of (current date) integer to calculate an item s age in years:

that can help you take your well-designed database from being simple data storage that has to be constantly validated on use and turn it into a trustable source of information. Every tool we presented can be coded in a manner that the database user needn t have any idea that it s running. We can t stop the user who wants to spell the name Michael as Micheal (or even F-R-E-D, for that matter), but we can stop someone from putting in a salary of -100, or entering NULL for required data, and we can do our best to avoid the most basic issues that take tons of time to code around when data is used. SQL Server provides tools such as data types to define the reasonable storage of values, NULL specifications to require data when it must be available, uniqueness constraints to prevent duplicate values, filtered unique indexes to prevent duplicate values on a subset of rows, foreign key constraints to ensure related data is correct, check constraints to make sure that values in the row meet the minimum standards, and finally, as a last resort, triggers to catch all other needs. None of this is all that hard to do. Even triggers are straightforward to code once you get the concept of multi-row handling. The hardest part is gaining the acceptance of the programmer community. During the development process, they re likely to get pinged with errors that they don t expect because they haven t written their code to cover all of the cases that might occur. Remind them that you re building an application for the future, not just to get done faster.

CURRENT-TRANSFERRING RESISTOR A BIPOLAR transistor has two P-N junctions There are two configurations: a P-type layer sandwiched between two N-type layers, or an N-type layer between two P-type layers

Summary

When you enter a time in a script, always enter the date as well If you don t, AppleScript automatically adds the current date for you when you compile the script This can be useful, but for clarity, you should enter the dates explicitly