The type of D.C. motor used for shears and punches is_____________?
Correct answer: D. cumulative compound D.C. motor
- A. shunt motor
- B. series motor
- C. differential compoutid D.C. motor
- D. cumulative compound D.C. motor
Explanation
Shears and punches need a high starting and overload torque, which is supplied by a cumulative compound motor through the series-field contribution. A shunt motor has comparatively poor starting torque for these duties.
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