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12 Suppose a 10-W amplifier is used with speakers designed for a 100-W amplifier Which of the following statements is true (a) The speakers are capable of handling the amplifier output (b) The amplifier might be damaged by the speakers (c) Electromagnetic interference is more likely to occur than would be the case if the speakers were designed for a 10-W amplifier (d) The speakers are likely to produce excessive distortion 13 Which of the following frequencies cannot be received by an AM/FM tuner (a) 830 kHz (b) 957 kHz (c) 901 MHz (d) 1073 MHz 14 Which of the following statements about woofers is true (a) They are especially useful for reproducing the sounds of barking dogs (b) They are designed to handle short, intense bursts of sound (c) They should not be used with graphic equalizers (d) They are specifically designed to reproduce low-frequency sounds 15 Suppose you have an amateur radio station and its transmitter causes EMI to your hi-fi system Which of the following would almost certainly not help (a) Build a new transmitter that works on the same frequencies with the same power output as your existing transmitter (b) Reduce the transmitter output power (c) Install shielded speaker wires in the hi-fi system, and be sure the system is well grounded (d) Move the amateur radio transmitting antenna to a location farther away from the hi-fi system 16 In an analog audio tape recorder/player, the recording head (a) converts sound waves to radio signals (b) converts sound waves to fluctuating electric current (c) converts AF current to a fluctuating magnetic field (d) converts dc to AF current 17 A rack-mounted hi-fi system (a) can save floor space (b) is more susceptible to EMI than a compact system (c) is cheaper than a compact system (d) is designed especially for use with vinyl disks and turntables 18 An audio mixer (a) cannot match impedances among interconnected components (b) cannot increase the audio output of an amplifier.

You can return a value from a function with the return statement, which in adder s case looks like this:

function adder(operand1, operand2) { return operand1 + operand2; }

In an ac circuit or system containing nonzero resistance and nonzero reactance, the relationships among true power PT, apparent (VA) power PVA, and imaginary (reactive) power PX are as follows: PV A2 = P T2 + PX2 PT < PV A PX < PV A

That is, we re adding operand1 and operand2, the two data items passed to adder, and returning the sum That way, when you call, say, adder(6, 6), JavaScript will replace that call with the value returned from the adder function at run time All of which means that here s how you can call adder from another function, display (this is adderhtml):

If there is no reactance in the circuit or system, then PVA = P T, and P X = 0 Engineers strive to minimize, and if possible eliminate, the reactance in power-transmission systems

<html> <head> <title>Returning data from functions</title> <script language="javascript"> function display() { documentgetElementById("targetDiv")innerHTML =

Power Factor In an ac circuit, the ratio of the true power to the VA power, PT/PVA, is called the power factor If there is no reactance, the ideal case, then PT = PVA, and the power factor (PF ) is equal to 1 If the circuit contains all reactance and no resistance of any significance (that is, zero or infinite resistance), then PT = 0, and therefore PF = 0 When a load, or a circuit in which you want power to be dissipated, contains resistance and reactance, then PF is between 0 and 1 That is, 0 < PF < 1 The power factor can also be expressed as a percentage between 0 and 100, written PF% Mathematically, we have these formulas for the power factor:

2:

"6 + 6 = " + adder(6, 6); } function adder(operand1, operand2) { return operand1 + operand2; } </script> </head>

PF = PT/PVA PF% = 100PT/PVA When a load has some resistance and some reactance, then some of the power is dissipated as true power, and some is rejected by the load as imaginary power In a sense, this imaginary power is sent back to the power source There are two ways to determine the power factor in an ac circuit that contains reactance and resistance One method is to find the cosine of the phase angle The other method involves the ratio of the resistance to the absolute-value impedance

.

<body> <h1>Returning data from functions</h1> <input type="button" onclick="display()" value="Click to add 6 + 6"> <div id="targetDiv"> </div> </body> </html>

Cosine of Phase Angle Recall that in a circuit having reactance and resistance, the current and the voltage are not in phase The phase angle ( ) is the extent, expressed in degrees, to which the current and the voltage differ in phase If there is no reactance, then = 0 If there is a pure reactance, then either = +90 (if the reactance is inductive) or else = 90 (if the reactance is capacitive) The power factor is equal to the cosine of the phase angle:

Take a look at adderhtml in Figure 2-8 When you click the button, presto, 6 is added to 6 and you can see the results What happened here was that 6 and 6 were passed to the adder function, which added them and returned the sum, 12 Nice