Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
Color of normal silica gel is
Blue
Red
Brown
Pink
Blue
Normal, dry silica gel used in the conservator tank of a transformer is deep blue in color. It acts as a desiccant, absorbing moisture from the air entering the transformer during the breathing process.
Normal, dry silica gel used in the conservator tank of a transformer is deep blue in color. It acts as a desiccant, absorbing moisture from the air entering the transformer during the breathing process.
CoCl2тАЛ+6H2тАЛOтЖТCoCl2тАЛтЛЕ6H2тАЛO тАФ Chemical reaction representing moisture absorption
Silica gel contains cobalt chloride, which acts as a moisture indicator. When the gel is dry, the cobalt chloride is in a dehydrated state, exhibiting a blue color; as it absorbs moisture, it undergoes a chemical hydration process, transitioning to a hydrated state which appears pink.
Used in the breather of an oil-filled transformer.
Prevents moisture from contaminating the transformer oil, which would reduce its dielectric strength.
When the color changes from blue to pink, the silica gel requires reactivation or replacement.
Effectively maintains oil insulation properties
Easy visual monitoring of moisture saturation
Requires periodic maintenance (reactivation or replacement)
Can be toxic if ingested
Transformer breathers
Air drying systems in electrical equipment
Moisture control in shipping containers
Reactivation of silica gel is done by heating it in an oven at approximately 120┬░C until it regains its blue color.
Option D (Pink) represents the color of saturated (wet) silica gel, not the initial normal state.
A is correct тАФ Normal, dry silica gel is blue, which serves as a visual indicator for its moisture-absorbing capacity in electrical transformers.
In competitive exams, remember that Silica Gel is used in the Breather to protect oil; if the oil gets contaminated by moisture, its breakdown voltage drops significantly.