What is the voltage reading when the selector is in the 1,000 DCV position?

When the selector is positioned at the 1,000 DCV setting, it indicates that the measurement tool is set to read voltages up to 1,000 volts in a DC circuit. This means that you would expect to obtain a reading that is within the range of what the multimeter can accurately measure in that specific setting.

The voltage reading of 277 VDC would be the accurate measurement, as it is a typical value that can be found in some DC applications, especially in power systems. This value falls comfortably within the range that the selected measurement setting can read, making it a logical and plausible choice.

Other values, such as 300 VDC, 250 VDC, and 350 VDC, while they may be possible readings in different contexts, do not align as closely with standard operational parameters found in practical scenarios for the specified settings and systems you would encounter in a substation environment. Thus, based on practical applications, 277 VDC is a reasonable and accepted figure when dealing with typical DC voltages.