MPSC Rajyaseva 2023 CSAT — Question 38
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मोटर चालू केल्यावर विद्युतप्रवाह सुरुवातीला खूप मोठा का असतो ? Why is the current initially very large when a motor is turned on ?
1)कारण माघारी विद्युतगामक खूप मजबूत असतो / Because the back emf is very strong
2)कारण यांत्रिक भार खूप जास्त असतो / Because the mechanical load is very heavy
3)कारण वेटोळ्याचा प्रतिकार खूप जास्त असतो / Because the resistance of the coils is very high
4)कारण सुरुवातीला माघारी विद्युतगामक नसतो / Because there is initially no back emf✓ Correct
When a motor is just turned on, its speed is zero, so back emf is zero. Due to the absence of back emf opposing the supply voltage, a large current initially flows through the armature.
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