You Can Continue to Use Your Less Efficient Machine at a Cost

question 4

Multiple Choice

You can continue to use your less efficient machine at a cost of $8,000 annually.Alternatively,you can purchase a more efficient machine for $12,000 plus $5,000 annual maintenance.If the new machine lasts 5 years and the cost of capital is 15%,you should:

• A) buy the new machine and save $600 in equivalent annual costs.
• B) buy the new machine and save $388 in equivalent annual costs.
• C) keep the old machine and save $388 in equivalent annual costs.
• D) keep the old machine and save $580 in equivalent annual costs.

Understand the configurations (wye and delta) used in three-phase motors and their impact on motor voltage and operation.

Recognize the importance of manufacturer's information for the correct configuration and connection of motors.

Know the effects of different voltages on motor operation and efficiency.

Discuss the technical aspects of starting mechanisms for large motors and their effects on current and torque.

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