OBJECTIVE TESTS 1. In a d.c. motor, undirectional torque is produced with the help of (a) brushes (b) commutator (c) end-plates (d) both (a) and (b) 2. The counter e.m.f. of a d.c. motor (a) often exceeds the supply voltage (b) aids the applied voltage (c) helps in energy conversion (d) regulates its armature voltage […]
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