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What are possible sources of heat for a fuel heater?
Solar and geothermal
Hydraulic and pneumatic
Engine bleed air and engine lubricating oil
Electric and magnetic
The correct answer is: Engine bleed air and engine lubricating oil
Possible sources of heat for a fuel heater include engine bleed air and engine lubricating oil. The other options, such as solar and geothermal, hydraulic and pneumatic, and electric and magnetic, are not commonly used as heat sources for fuel heaters. Solar and geothermal energy are not typically used in industrial or transportation systems, and hydraulic and pneumatic systems are usually used for power applications rather than for heating. Electric and magnetic sources, while commonly used for heating, are not typically used in the context of fuel heaters. Therefore, option C is the best choice for sources of heat for a fuel heater.