The correct answer is: A shell-type transformer has high eddy current losses.
Eddy current losses are caused by the movement of electric current through a conductor. The current creates a magnetic field, which in turn creates eddy currents in the conductor. These eddy currents cause heat, which reduces the efficiency of the transformer.
Shell-type transformers have a higher eddy current loss than core-type transformers because the windings are not surrounded by a magnetic core. This means that the magnetic field from the current in the windings can more easily interact with the conductor, creating eddy currents.
Core-type transformers have a lower eddy current loss because the windings are surrounded by a magnetic core. This magnetic core blocks the magnetic field from the current in the windings, preventing it from interacting with the conductor and creating eddy currents.
Reduced magnetic leakage: This is not true for shell-type transformers. Shell-type transformers have a higher magnetic leakage than core-type transformers because the windings are not surrounded by a magnetic core. This means that the magnetic field from the current in the windings can more easily leak out of the transformer, reducing the efficiency of the transformer.
Negligibly hysteresis losses: This is also not true for shell-type transformers. Shell-type transformers have a higher hysteresis loss than core-type transformers because the windings are not surrounded by a magnetic core. This means that the magnetic field from the current in the windings can more easily interact with the conductor, causing the conductor to become magnetized. This magnetization and demagnetization of the conductor causes hysteresis losses, which reduce the efficiency of the transformer.