Question

In calibration of a dynamometer Wattmeter by potentiometer, phantom loading arrangement is used because:

• A. the arrangement gives accurate results
• B. the power consumed in calibration work is minimum
• C. the method gives quick results
• D. the onsite calibration is possible

Hint:

\textbf{Tip:} Phantom loading is ideal for calibration tasks where full-scale conditions must be simulated without incurring full power consumption.

Answer 1

The Correct Option is B

Phantom loading is a method used to calibrate electrical instruments like wattmeters without wasting large amounts of power.
It works by supplying rated voltage and current to the instrument under test using separate sources, one for voltage and one for current.
Since only a small power is actually consumed (the product of voltage of one source and current of the other), the energy requirement is minimal.
Hence, the technique is particularly efficient and economical in terms of power usage.