Practice Test (See related pages) 1 A semiconductor is a material that is both a good conductor and a good insulator. A) True B) False 2 One of the most useful applications of a semiconductor diode is converting ac voltage into dc voltage. A) True B) False 3 The semiconductor element carbon is mainly used in the production of resistors. A) True B) False 4 The sharing of valence electrons is called coupled boarding. A) True B) False 5 A colored band near one end of an actual diode is used to indicate the cathode lead. A) True B) False 6 A graph of forward voltage versus forward current shows that a diode is a linear device. A) True B) False 7 The condition of a semiconductor diode can be determined with an ohmmeter. A) True B) False 8 The part number for a diode will always begin with the prefix 2N. A) True B) False 9 A circuit that converts the ac power-line voltage to the required dc value is called a power amplifier. A) True B) False 10 A circuit that provides an entirely positive or negative output voltage when an ac input voltage is applied is called a(n) rectifier. 11 The unfiltered output from a half-wave or full-wave rectifier is a(n) dc voltage. 12 In most cases, the LED voltage drop can be assumed to be V. 13 The n side of a diode is called the . 14 Breakdown ratings are ratings and should never be exceeded. 15 are able to produce a dc output voltage because they are unidirectional devices. 16 The rms value of a full-wave signal is equal to times the peak voltage. 17 Voltage is the most common application of a zener diode. 18 What includes the variations between two successive points having the same value and varying in the same direction? A) fluctuating dc B) oscillations C) cycle D) wavetrap 19 Which of the following is not an advantage for using a bridge rectifier rather than a two-diode full-wave rectifier? A) smaller B) lighter C) more efficient design D) costs less 20 Why does the full-wave rectifier provide a larger dc output voltage with less ripple than a half-wave rectifier? A) the discharge time for a half-wave is only one-half that of a full-wave B) the discharge time for a full-wave is only one-half that of a half-wave C) the charge time for a full-wave is twice that of the half-wave D) the charge time for a half-wave is twice that of the full-wave 21 What diode is optimized for operation in the breakdown region and is often used as a voltage regulator? A) silicon rectifier B) light-emitting C) zener D) tunnel 22 Which of the following is a material that is neither a good conductor nor a good insulator? A) copper B) glass C) silicon D) silver 23 The sharing of valence electrons is called A) covalent bonding B) doping C) biasing D) rectifying 24 What is the barrier potential for a silicon diode? A) 0.4 V B) 0.7 V C) 1.414 V D) 3.414 V 25 When using an ohmmeter to check a semiconductor diode, the resistance should be A) low in both directions B) high in both directions C) high in one direction and low in the other D) zero in one direction and 100 Ω in the other
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