What are at least two disadvantages to using single-phase motors?
What will be an ideal response?
When single-phase motors are used, they will be limited to relatively low horsepower and low torque load requirement applications. Single-phase induction motors are larger per horsepower, draw more current to generate the same horsepower, they present an unbalanced load to the electrical distribution system, and they are more complicated than three-phase motors. The most complicating factor of single-phase induction motors over three-phase induction motors, is that they require additional auxiliary windings to operate. These additional mechanical parts in single-phase induction motors simply present more things that can go wrong with the motor, which causes them to be less reliable than three-phase induction motors.
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Analyze the rigid frames in Figure P14.10, using symmetry to simplify the analysis. Compute all reactions and draw the moment diagrams for all members. Also E is constant.
What rating of diesel fuel indicates how well a diesel engine will start?
A) Cloud point B) Cetane rating C) Specific gravity rating D) Sulfur content
Give three issues for construction companies that grow out of Subpart C
What will be an ideal response?
Chilled water systems use a primary refrigerant to remove heat from a secondary refrigerant in a chiller unit. What is the secondary refrigerant in such systems?
A) Ammonia B) R22 C) R134A D) Water