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12 Which of the following does not increase the loss in a transmission line (a) Reducing the power output of the source (b) Increasing the degree of mismatch between the line and the load (c) Reducing the diameter of the line conductors (d) Raising the frequency 13 Which of the following is a significant problem that standing waves can cause in an RF transmission line (a) Line overheating (b) Excessive power loss (c) Inaccuracy in power measurement (d) All of the above 14 Suppose a coil and capacitor are in series The inductance is 88 mH and the capacitance is 1000 pF What is the resonant frequency (a) 17 kHz (b) 540 Hz (c) 17 MHz (d) 540 kHz 15 Suppose a coil and capacitor are in parallel, with L = 100 H and C = 10 pF What is fo (a) 159 kHz (b) 504 MHz (c) 159 MHz (d) 504 MHz 16 Suppose you want to build a series-resonant circuit with fo = 141 MHz A coil of 135 H is available How much capacitance is needed (a) 0945 F (b) 945 pF (c) 945 pF (d) 945 pF 17 Suppose you want to build a parallel-resonant circuit with fo = 213 MHz A capacitor of 220 pF is available How much inductance is needed (a) 254 mH (b) 254 H (c) 254 H (d) 254 H 18 A 1 4-wave section of transmission line is cut for use at 211 MHz The line has a velocity factor of 0800 What is its physical length in meters (a) 111 m (b) 355 m

nections that have pending results, there are so many restrictions and evil side effects, that there are few real scenarios in which this approach provides any benefit over opening another connection. Another myth that I hope to bust is that all applications should always use a connectquery-disconnect connection strategy. I can see how this myth got started, as this is a best practice for ASP, ASP.NET, and Web Service applications. If you re building a Microsoft Windows Presentation Foundation (WPF), Windows Forms, or other client-side executable, it does not always (or even usually) make sense. Instead, I often recommend connecting to the server when connectivity is first required and maintaining the connection for the life of the application. The benefits to this approach are compelling. First, your application need not spend resources opening (and closing) connections.

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But the most significant benefit is the ability to manage connection-scoped server state. For example, you can create Temporary tables (in tempdb) that can be indexed to hold intermediate query results based on the current client. These can be used to dramatically improve query performance. Connection-specific connection settings that need be applied only once and stick with the connection scope. Server-side cursors against live data, although this is not often done. Consider that when you open a connection, SQL Server has to launch an agent to manage your requests, allocate memory, and prepare for your work. When you close a connection, the server has to clean up the mess you left behind like the maid who comes into your hotel room after that all-nighter. Any connection-owned resources, such as temporary tables or server-side cursors, have to be freed, and the agent has to be shut down. These operations can be postponed by using connection pooling, as I ll discuss later (see Managing the connection pool later in this chapter).

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