What is the voltage and amp-hour capacity provided by the Main Battery?

The correct choice indicates that the Main Battery provides a voltage of 24 volts DC and a capacity of 42 amp-hours. This configuration is significant because a 24vDC battery system is commonly used in various applications, including aviation and military systems, where higher voltage systems can efficiently power larger loads while minimizing the current and reducing potential losses.

The 42 amp-hour rating indicates the battery's capacity to provide a continuous current of 42 amps for one hour, or a proportionate amount of current over a longer period. This high capacity is essential for systems requiring sustained power over time, which is critical for dependable operation during critical tasks or in environments where reliable energy supply is paramount.

The other options offer lower capacities or incorrect voltage levels that would not meet the operational requirements often associated with main batteries in robust systems, making them unsuitable for the intended applications. Thus, the choice of 24 volts DC and 42 amp-hours accurately reflects the performance standards expected of a Main Battery in relevant contexts.