Question 386Electricity & Electronics - QMED
70% to passAs shown in figures "A", "B", "C", and "D" of the illustration, what is the usual means by which the rotation direction of the motor is reversed? Illustration EL-0207
AInterchanging leads T4 and T8
BInterchanging leads L1 and L2
CInterchanging leads T5 and T8
DInterchanging leads T1 and T5
AI Explanation
The correct answer is C) Interchanging leads T5 and T8. In an induction motor, the direction of rotation can be reversed by interchanging any two of the three phase leads connected to the motor. In this case, interchanging leads T5 and T8 will effectively reverse the direction of the rotating magnetic field, causing the motor to rotate in the opposite direction. The other options are incorrect because they do not represent the usual means of reversing the motor's rotation. Interchanging L1 and L2 (option B) or T1 and T5 (option D) would not necessarily reverse the rotation. Interchanging T4 and T8 (option A) is also not the typical method, as it does not involve interchanging two of the three phase leads.
Related Questions
Q159:If the approximate voltage to be measured in an electric circuit is not known, w... Q93:How does the resistance of a conductor vary? Q312:When a motor is started by the controller shown in figure "C" of the illustratio... Q6:Under normal conditions, storage batteries used for starting the emergency diese... Q337:The electrical diagram shown in figure “B” of the illustration represents what t...
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources