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Part 2 Test Question 41.
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(d) C = 60 F and R = 25 . (e) L = 60 H and R = 25 . 42. Suppose two pure sine waves have no dc components, have the same frequency, and have the same peak-to-peak voltages, but they cancel each other out when combined. What is the phase difference between the waves (a) 45 (b) 90 (c) 180 (d) 270 (e) 360 43. Suppose a series RC circuit has a resistance of 50 and a capacitive reactance of 37 . What is the phase angle (a) 37 (b) 53 (c) 37 (d) 53 (e) It cannot be calculated from the data given. 44. Suppose a 200- resistor is in series with a coil and capacitor, such that XL = 200 and XC = 100 . What is the complex impedance (a) 200 j100 (b) 200 j200 (c) 200 + j100 (d) 200 + j200 (e) Impossible to determine from the data given
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45. The characteristic impedance of a transmission line (a) is negative imaginary. (b) is positive imaginary. (c) depends on the frequency. (d) depends on the construction of the line. (e) depends on the length of the line. 46. Suppose the period of a pure sine wave is 2 10 8s. What is the frequency (a) 2 108 Hz (b) 20 MHz (c) 50 kHz (d) 50 MHz (e) 500 MHz 47. Suppose a series RC circuit has a resistance of 600 and a capacitance of 220 pF. What is the phase angle (a) 20 (b) 20 (c) 70 (d) 70 (e) Not determinable from the data given 48. A capacitor with a negative temperature coefficient (a) works less well as the temperature increases. (b) works better as the temperature increases. (c) heats up as its value is made larger. (d) cools down as its value is made larger. (e) exhibits increasing capacitance as the temperature drops. 49. Suppose three coils are connected in parallel. Each has an inductance of 300 H. There is no mutual inductance. What is the net inductance (a) 100 H (b) 300 H (c) 900 H (d) 17.3 H (e) 173 H 50. Suppose a coil has 100 of inductive reactance at 30.0 MHz. What is its inductance (a) 0.531 H (b) 18.8 mH (c) 531 H (d) 18.8 H (e) It can t be found from the data given.
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PART
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CHAPTER
Introduction to Semiconductors
SINCE THE 1960S, WHEN THE TRANSISTOR BECAME COMMON IN CONSUMER DEVICES, SEMICONDUCTORS
have acquired a dominating role in electronics. The term semiconductor arises from the ability of these materials to conduct some of the time, but not all the time. The conductivity can be controlled to produce effects such as amplification, rectification, oscillation, signal mixing, and switching.
The Semiconductor Revolution
Decades ago, vacuum tubes, also known as electron tubes, were the only devices available for use as amplifiers, oscillators, detectors, and other electronic circuits and systems. A typical tube (called a valve in England) ranged from the size of your thumb to the size of your fist. They are still used in some power amplifiers, microwave oscillators, and video display units. Tubes generally require high voltage. Even in modest radio receivers, 100 V to 200 V dc was required when tubes were employed. This mandated bulky power supplies, and created an electrical shock hazard. Nowadays, a transistor of microscopic dimensions can perform the functions of a tube in most situations. The power supply can be a couple of AA cells or a 9-V transistor battery. Even in high-power applications, transistors are smaller and lighter than tubes. Figure 19-1 is a size comparison drawing between a transistor and a vacuum tube for use in an AF or RF power amplifier. Integrated circuits (ICs), hardly larger than individual transistors, can do the work of hundreds or even thousands of vacuum tubes. An excellent example of this technology is found in personal computers and the peripheral devices used with them. 19-1 A power-amplifier
transistor (at left) is much smaller than a vacuum tube of comparable powerhandling capacity (right). 315
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