Generation Electricity for Aircraft

What is the principle behind the conversion of light energy into electrical energy in a photovoltaic cell?

• Absorption of light causing heat in the material
• Reflection of photons off the material's surface
• Conversion of radiant energy into electrical energy

What type of current do photovoltaic panels supply directly?

• Alternating current (AC)
• Direct current (DC)
• Pulsating current

What is the primary use of thermocouples in the aviation industry?

• Measuring a wide range of temperatures
• Generating electricity from motion
• Detecting changes in pressure

What determines the voltage difference in a thermocouple?

• The thickness of the wires
• The type of metals used
• The length of the wires

What is required for the Peltier effect to occur?

• A single type of material
• A thermal gradient in one material
• Two materials of different types

In aviation, thermocouples are NOT used to measure which of the following?

• Cylinder head temperatures
• Battery voltage
• Inter-turbine temperature

What is the main principle behind piezoelectric electricity generation?

• Application of heat to a crystal
• Exposure of crystal to sunlight
• Application of mechanical pressure to a crystal

Which of the following materials is commonly used as a piezoelectric material today?

• Silicon
• Crystalline quartz
• Copper

In piezoelectric materials, what is the result when voltage is applied between certain faces of the crystal?

• It produces a mechanical distortion
• It heats up
• It loses its piezoelectric properties

What is the primary mechanism by which a battery generates electricity?

• By converting heat into electricity
• By freeing more electrons in one metal than the other through a chemical reaction
• By exposing metals to sunlight