A(n) ___ is used to ensure that a motor rotates in the correct direction when connected to a circuit.

A(n) ___ is used to ensure that a motor rotates in the correct direction when connected to a circuit.

• A. Oscilloscope
• B. Megohmmeter
• C. Phase sequence indicator
• D. Digital logic probe

Answer: (C)

A phase sequence indicator is utilized to determine the phase sequence in three-phase electrical systems, ensuring that a motor rotates in the correct direction when powered. This instrument measures the phase angles between the three phases and indicates whether the sequence is correct for clockwise or counterclockwise rotation. Correct phase sequence is crucial because an incorrect sequence can lead to malfunctioning of the motor or mechanical damage. While devices like an oscilloscope, a megohmmeter, and a digital logic probe serve important functions in electrical diagnostics and testing, they do not directly address the need to confirm the rotational direction of a motor. The oscilloscope is primarily used for visualizing electrical signals and waveforms, the megohmmeter measures insulation resistance, and the digital logic probe is used for testing logic levels in digital circuits—none of which relate to the specific requirement of confirming motor rotation direction in three-phase systems.

A phase sequence indicator is utilized to determine the phase sequence in three-phase electrical systems, ensuring that a motor rotates in the correct direction when powered. This instrument measures the phase angles between the three phases and indicates whether the sequence is correct for clockwise or counterclockwise rotation. Correct phase sequence is crucial because an incorrect sequence can lead to malfunctioning of the motor or mechanical damage.

While devices like an oscilloscope, a megohmmeter, and a digital logic probe serve important functions in electrical diagnostics and testing, they do not directly address the need to confirm the rotational direction of a motor. The oscilloscope is primarily used for visualizing electrical signals and waveforms, the megohmmeter measures insulation resistance, and the digital logic probe is used for testing logic levels in digital circuits—none of which relate to the specific requirement of confirming motor rotation direction in three-phase systems.