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(c) they provide a way to represent what happens in resistance-reactance circuits (d) engineers like to work with sophisticated mathematics (e) Forget it! Complex numbers are never used to represent impedance 25 Which of the following (within reason) has no effect on the value, in farads, of a capacitor (a) The mutual surface area of the plates (b) The dielectric constant of the material between the plates (c) The spacing between the plates (d) The amount of overlap between plates (e) The frequency 26 The 0 phase point in an ac sine wave is usually considered to be the point in time at which the instantaneous amplitude is (a) zero and negative-going (b) at its negative peak (c) zero and positive-going (d) at its positive peak (e) any value; it doesn t matter 27 The inductance of a coil can be adjusted in a practical way by (a) varying the frequency of the signal applied to the coil (b) varying the number of turns using multiple taps (c) varying the current in the coil (d) varying the wavelength of the signal applied to the coil (e) varying the voltage across the coil 28 Power factor is defined as the ratio of (a) true power to VA power (b) true power to imaginary power (c) imaginary power to VA power (d) imaginary power to true power (e) VA power to true power 29 Consider a situation in which you want to match a feed line with Zo = 50 to an antenna with a purely resistive impedance of 200 A quarter-wave matching section should have which of the following (a) Zo = 150 (b) Zo = 250 (c) Zo = 125 (d) Zo = 133 (e) Zo = 100

No matter how many rows you modify in a statement, the condition specified by a constraint is checked one row at a time, and can t see which other rows are modified. You can access the columns in a table by name with no alias, or you can access data in other rows, or even tables using user-defined functions. As another example, consider the employee.salary example we used previously in the chapter. If you wanted to make sure it s greater than 0, you might define the following:

ALTER TABLE employee ADD CONSTRAINT employee$salaryNonNegative CHECK (salary > 0)

property committee_name : "Management Steering Committee" display dialog "Please confirm the committee name:" default answer committee_name set committee_name to text returned of the result

30 The vector 40 + j30 in the RX plane represents (a) 40 of resistance and 30 H of inductance (b) 40 H of inductance and 30 of resistance (c) 40 of resistance and 30 of inductive reactance (d) 40 of inductive reactance and 30 of resistance (e) 40 H of inductive reactance and 30 of resistance 31 In a series RC circuit where R = 300 and X C = 30 , (a) the current leads the voltage by a few degrees (b) the current leads the voltage by almost 90 (c) the voltage leads the current by a few degrees (d) the voltage leads the current by almost 90 (e) the voltage leads the current by 90 32 In a step-down transformer, (a) the primary voltage is greater than the secondary voltage (b) the purely resistive impedance across the primary is less than the purely resistive impedance across the secondary (c) the secondary voltage is greater than the primary voltage (d) the output frequency is higher than the input frequency (e) the output frequency is lower than the input frequency 33 Suppose a capacitor of 470 pF is in parallel with an inductor of 444 H What is the resonant frequency (a) 349 MHz (b) 349 kHz (c) 130 MHz (d) 130 GHz (e) It cannot be calculated from the data given 34 A pure sine wave contains energy at (a) only one specific frequency (b) a specific frequency and its even harmonics (c) a specific frequency and its odd harmonics (d) a specific frequency and all its harmonics (e) a specific frequency and its second harmonic only 35 Inductive susceptance is (a) the reciprocal of inductance (b) negative imaginary (c) equivalent to capacitive reactance (d) the reciprocal of capacitive susceptance (e) positive imaginary

The Boolean expression can t directly reference another table, but you can use a function to access the data in the table. Note that I said you can t see which other rows were modified, but the data is already in the table, so you can access it in the function s query. One example of using a function is limiting the cardinality of a value in a database (or the count of the times a value can appear). Using a unique constraint, you can

Figure 4-1

easily limit the cardinality to 1, but if you want to allow a number different than 1, there isn t an easy way to do this declaratively. So we can use a function and a check constraint. Take the following table:

.

create table cardinalityLimit ( value varchar(10) )

(continued)

If we want no more than two of the same values for the value column, you can build a simple function like this:

7 Run the script again This time, the name you entered appears in the dialog box 8 Save the script under a name of your choice