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E6F Electro-optical technology: photoconductivity; photovoltaic devices; optical sensors and encoders; optically isolated switching

  • E6F01 (C) What absorbs the energy from light falling on a photovoltaic cell? #card
    • A. Protons
    • B. Photons
    • C. Electrons
    • D. Holes
  • E6F02 (A) What happens to photoconductive material when light shines on it? #card
    • A. Resistance decreases
    • B. Resistance increases
    • C. Reflectivity increases
    • D. Reflectivity decreases
  • E6F03 (D) What is the most common configuration of an optoisolator or optocoupler? #card
    • A. A lens and a photomultiplier
    • B. A frequency-modulated helium-neon laser
    • C. An amplitude-modulated helium-neon laser
    • D. An LED and a phototransistor
  • E6F04 (B) What is the photovoltaic effect? #card
    • A. The conversion of voltage to current when exposed to light
    • B. The conversion of light to electrical energy
    • C. The effect that causes a photodiode to emit light when a voltage is applied
    • D. The effect that causes a phototransistor’s beta to decrease when exposed to light
  • E6F05 (A) Which of the following describes an optical shaft encoder? #card
    • A. A device that detects rotation by interrupting a light source with a patterned wheel
    • B. A device that measures the strength of a beam of light using analog-to-digital conversion
    • C. An optical computing device in which light is coupled between devices by fiber optics
    • D. A device for generating RTTY signals by means of a rotating light source
  • E6F06 (C) Which of these materials is most commonly used to create photoconductive devices? #card
    • A. Polyphenol acetate
    • B. Argon
    • C. Crystalline semiconductor
    • D. All these choices are correct
  • E6F07 (B) What is a solid-state relay? #card
    • A. A relay that uses transistors to drive the relay coil
    • B. A device that uses semiconductors to implement the functions of an electromechanical relay
    • C. A mechanical relay that latches in the on or off state each time it is pulsed
    • D. A semiconductor switch that uses a monostable multivibrator circuit
  • E6F08 (C) Why are optoisolators often used in conjunction with solid-state circuits that control 120 VAC circuits? #card
    • A. Optoisolators provide a low-impedance link between a control circuit and a power circuit
    • B. Optoisolators provide impedance matching between the control circuit and power circuit
    • C. Optoisolators provide an electrical isolation between a control circuit and the circuit being switched
    • D. Optoisolators eliminate the effects of reflected light in the control circuit
  • E6F09 (D) What is the efficiency of a photovoltaic cell? #card
    • A. The output RF power divided by the input DC power
    • B. The output in lumens divided by the input power in watts
    • C. The open-circuit voltage divided by the short-circuit current under full illumination
    • D. The relative fraction of light that is converted to current
  • E6F10 (B) What is the most common material used in power-generating photovoltaic cells? #card
    • A. Selenium
    • B. Silicon
    • C. Cadmium sulfide
    • D. Indium arsenide
  • E6F11 (A) What is the approximate open-circuit voltage produced by a fully illuminated silicon photovoltaic cell? #card
    • A. 0.5 volts
    • B. 0.7 volts
    • C. 1.1 volts
    • D. 1.5 volts