MPSC Rajyaseva 2023 CSAT — Question 37

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मोटरमध्ये माघारी विद्युतगामकाचे महत्व काय आहे ? Why is back emf important in a motor ?

1)यामुळे मोटरचा वेग वाढतो / It increases the speed of the motor

2)यामुळे मोटरमधील विद्युतप्रवाह कमी होतो / It reduces the current in the motor✓ Correct

3)हे उपयुक्त यांत्रिक कार्य निर्माण करते / It generates useful mechanical work

4)यामुळे मोटरचा पीडन परीबल कमी होतो / It reduces the torque of the motor

Back emf in a DC motor opposes the supplied voltage, regulates the current drawn, and helps control the speed of the motor automatically.

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