A. High initial cost
B. High maintenance cost
C. Low efficiency at high loads
D. High cost, high maintenance, and low efficiency
Answer: D. High cost, high maintenance, and low efficiency
Explanation:
Drawbacks of Ward Leonard system:
- Higher initial cost due to the use of two additional machines (M-G set) of the same rating as the main dc motor.
- Larger size and weight.
- Require more floor area and a costly foundation.
- Lower efficiency due to higher losses.
- Frequent maintenance is needed.
- Since the efficiency, is essentially the product of the individual efficiencies of the two larger machines, the efficiency of this method is not as high as the rheostat speed control or field speed control method.
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