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Refer to the text in this chapter if necessary A good source is 18 or more correct Answers are in the back of the book 1 The power in a pure reactance is (a) radiated (b) true (c) imaginary (d) apparent 2 Which of the following is not an example of true power (a) Power in the form of heat, produced by dc flowing through a resistor (b) Power in the form of electromagnetic fields, radiated from a radio antenna (c) The product of the rms ac through a capacitor and the rms voltage across it (d) Power in the form of heat, produced by losses in an RF transmission line 3 Suppose the apparent power in a circuit is 100 W, and the imaginary power is 40 W What is the true power (a) 92 W (b) 100 W (c) 140 W (d) It is impossible to determine from this information 4 Power factor is equal to (a) apparent power divided by true power (b) imaginary power divided by apparent power (c) imaginary power divided by true power (d) true power divided by apparent power 5 Suppose a circuit has a resistance of 300 and an inductance of 135 H in series, and is operated at 100 MHz What is the power factor (a) 0334 (b) 0999 (c) 0595 (d) It cannot be determined from the information given

In this example, you create a script that launches Excel by creating a new workbook based on the Blank Document template The script then saves the workbook and closes it, leaving a workbook that you will use again in examples later in this chapter To create the script, follow these steps:

Although establishing a connection is fairly cheap, it s not free, so when designing highly scalable applications it makes sense to minimize the total number of times an application opens and closes connections, thereby getting the most out of each open/ close cycle This is especially true for ASP or Web Service applications that have to service dozens to thousands of connections a minute Because an ASP/ASPNET/Web Service application cannot (or should not) attempt to maintain a globally referenced Connection object, applications are designed around a just-in-time connection strategy This usually means acquiring a connection just before it s needed and releasing the connection back to the connection pool right after the results are captured by the client I discuss the connection pool a little later (see Connection management later in this chapter) I think this makes sense to an extent.

If you know that your application plans to make several queries in quick succession, some might suggest a broader-scope connection paradigm that holds the connection until all of these operations are complete This approach comes with an element of risk One of the more common failure modes for ASP-type applications is leaking connections that is, when connections are acquired (by the ConnectionOpen method) but not released (with the ConnectionClose method) Because the NET Framework s garbage collector (GC) does not run that often,2 orphaned connection objects (that have not been released) might languish in the object garbage heap for minutes to hours Because of this, any connection strategy must ensure that any connection that s acquired (opened) is release (closed) To facilitate ASP-type application connection churn, the data access providers have implemented a mechanism to cache connections it s called the connection pool.

1 If Excel is running at the moment, quit it in your preferred way For example, press z-Q 2 In AppleScript Editor, press z-N or choose File | New to create a new script 3 Start a tell block to Excel, addressing it by its application id string, commicrosoftExcel:

6 Suppose a series circuit has Z = 884 , with R = 500 What is the power factor, expressed as a percentage (a) 999 percent (b) 566 percent (c) 605 percent (d) 295 percent 7 Suppose a series circuit has R = 535 , with X = 755 What is the power factor, expressed as a percentage (a) 709 percent (b) 816 percent (c) 578 percent (d) 632 percent 8 The phase angle in an ac circuit is equal to (a) arctan (Z/R) (b) arctan (R/Z) (c) arctan (R/X) (d) arctan (X/R) 9 Suppose an ac ammeter and an ac voltmeter indicate that there are 220 W of VA power in a circuit that consists of a resistance of 50 in series with a capacitive reactance of 20 What is the true power (a) 237 W (b) 204 W (c) 880 W (d) 816 W 10 Suppose an ac ammeter and an ac voltmeter indicate that there are 57 W of VA power in a circuit The resistance is known to be 50 , and the true power is known to be 40 W What is the absolute-value impedance (a) 50 (b) 57 (c) 71 (d) It is impossible to determine on the basis of this data 11 Which of the following should be minimized in an RF transmission line (a) The load impedance (b) The load resistance (c) The line loss (d) The transmitter power

I ll devote some time to this mechanism a bit later when I discuss properties, methods, and events that the data access interfaces expose to help manage connections..

ADO.NET 2.0 and later supports the option to use Multiple Active Resultsets (MARS) connections. Although these permit developers to reuse con-

variable xbook, as shown in boldface here: