What would be the effect of a break in the tank ground on a transformer?

When there is a break in the tank ground on a transformer, it can lead to potentially hazardous situations. The transformer tank is usually grounded to ensure safety and to prevent any buildup of voltage that could occur due to faults or insulation failures. If this grounding is compromised, the tank may become energized with voltage during a fault condition. This poses a risk of electric shock to personnel and can cause damage to the transformer and surrounding equipment.

Grounding is a critical safety measure that ensures that electric currents find a path to the earth safely and does not remain within the transformer structure. If this grounding connection is lost, the system's overall safety is jeopardized, making it a potential hazard.

The other choices do not accurately represent the consequences of a break in the tank ground. While the transformer may appear to remain operational in the short term, the lack of grounding can lead to severe safety issues and electrical malfunctions over time.