Question

Multiple Choice (Select 1 out of 4 options, for the question below
The phase sequence R-B-Y denotes that emf of
Options
O phase R lags that of phase B by 120 degrees
O phase R lags that of phase Y by 120 degrees
phase R leads that of phase B by 120 degrees
horn Rhy 120 degrees​

Answer 1

Answer:

electric circuits. Since the direction of rotation of three phase electric motors can be changed by changing the phase sequence of supply. And also the correct operation of measuring instruments like 3 phase energy meter and automatic control of devices also depend on the phase sequence. Different types of phase sequence testers are available in today’s market like contact or non contact, static or rotating, etc., in a wide range of voltage or power ratings.

Hope it helps you