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Dc machine
Note:- You can add tough questions into your favourite list for second revision. |
A 220 V. DC shunt motor is operating at a speed of 1,440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. If the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be | |
A. | 1.79Ω [Correct Answer] |
B. | 2.1Ω [Wrong Answer] |
C. | 3.1Ω [Wrong Answer] |
D. | 18.9Ω [Wrong Answer] |