In the absence of the autotransformer, the step-up and step-down transformers would be supplied with a continuous voltage of:

The step-up and step-down transformers are designed to modify voltage levels in an electrical circuit. In many standard electrical systems, particularly in radiography and other medical imaging modalities, the common voltage levels used are 110 volts and 220 volts. However, specific regions or equipment may work with different standards or voltages.

When the question indicates "in the absence of the autotransformer," it suggests that the circuit may be functioning at a level without the typical adjustable voltage provided by the autotransformer. In certain setups, standard practice involves using a voltage of 220 volts for equipment that requires higher power, especially in professional medical and imaging environments.

The relevance of 220 volts is particularly significant because it aligns well with the operational requirements of many radiographic systems that demand substantial energy to generate the x-ray beams efficiently. This operational voltage level allows for adequate power delivery to the transformers, enabling them to either step up or step down the voltage as needed for the specific components of the radiographic system.

Understanding the functioning of transformers in radiographic equipment is crucial, as these devices must efficiently convert and manage voltage to ensure proper image production and safety. In this context, 220 volts serves as a suitable supply voltage in many applications, justifying its selection as