Question 36Electricity & Electronics - 1st Asst/Chief

The correct answer is B) Class 105. Class 105 electrical insulation is suited for the highest operating temperature among the choices provided. The classification of electrical insulation is based on the maximum continuous operating temperature the insulation can withstand without significant deterioration. Class 105 insulation is rated for a maximum continuous operating temperature of 105°C (221°F), which is higher than Class 90 (O) at 90°C (194°F) and Class 130 at 130°C (266°F). The other options are incorrect because Class 90 (O) has a lower maximum operating temperature, and Class 130, while rated for a higher temperature, is not the highest among the choices given.