E6F01:

What is photoconductivity?

  1. The conversion of photon energy to electromotive energy
  2. The increased conductivity of an illuminated semiconductor
  3. The conversion of electromotive energy to photon energy
  4. The decreased conductivity of an illuminated semiconductor

E6F02:

What happens to the conductivity of a photoconductive material when light shines on it?

  1. It increases
  2. It decreases
  3. It stays the same
  4. It becomes unstable

E6F03:

What is the most common configuration of an optoisolator or optocoupler?

  1. A lens and a photomultiplier
  2. A frequency modulated helium-neon laser
  3. An amplitude modulated helium-neon laser
  4. An LED and a phototransistor

E6F04:

What is the photovoltaic effect?

  1. The conversion of voltage to current when exposed to light
  2. The conversion of light to electrical energy
  3. The conversion of electrical energy to mechanical energy
  4. The tendency of a battery to discharge when used outside

E6F05:

Which describes an optical shaft encoder?

  1. A device which detects rotation of a control by interrupting a light source with a patterned wheel
  2. A device which measures the strength of a beam of light using analog to digital conversion
  3. A digital encryption device often used to encrypt spacecraft control signals
  4. A device for generating RTTY signals by means of a rotating light source

E6F06:

Which of these materials is affected the most by photoconductivity?

  1. A crystalline semiconductor
  2. An ordinary metal
  3. A heavy metal
  4. A liquid semiconductor

E6F07:

What is a solid state relay?

  1. A relay using transistors to drive the relay coil
  2. A device that uses semiconductors to implement the functions of an electromechanical relay
  3. A mechanical relay that latches in the on or off state each time it is pulsed
  4. A passive delay line

E6F08:

Why are optoisolators often used in conjunction with solid state circuits when switching 120VAC?

  1. Optoisolators provide a low impedance link between a control circuit and a power circuit
  2. Optoisolators provide impedance matching between the control circuit and power circuit
  3. Optoisolators provide a very high degree of electrical isolation between a control circuit and the circuit being switched
  4. Optoisolators eliminate the effects of reflected light in the control circuit

E6F09:

What is the efficiency of a photovoltaic cell?

  1. The output RF power divided by the input DC power
  2. The effective payback period
  3. The open-circuit voltage divided by the short-circuit current under full illumination
  4. The relative fraction of light that is converted to current

E6F10:

What is the most common type of photovoltaic cell used for electrical power generation?

  1. Selenium
  2. Silicon
  3. Cadmium Sulfide
  4. Copper oxide

E6F11:

What is the approximate open-circuit voltage produced by a fully-illuminated silicon photovoltaic cell?

  1. 0.1 V
  2. 0.5 V
  3. 1.5 V
  4. 12 V

E6F12:

What absorbs the energy from light falling on a photovoltaic cell?

  1. Protons
  2. Photons
  3. Electrons
  4. Holes

E6F13:

What is a liquid crystal display (LCD)?

  1. A modern replacement for a quartz crystal oscillator which displays its fundamental frequency
  2. A display utilizing a crystalline liquid and polarizing filters which becomes opaque when voltage is applied
  3. A frequency-determining unit for a transmitter or receiver
  4. A display that uses a glowing liquid to remain brightly lit in dim light

E6F14:

Which of the following is true of LCD displays?

  1. They are hard to view in high ambient light conditions
  2. They may be hard to view through polarized lenses
  3. They only display alphanumeric symbols
  4. All of these choices are correct