Concrete cures to its maximum strength, under normal conditions, in about _____
a. 7 days
b. 14 days
c. 21 days
d. 28 days
d
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Answer the following statement(s) true (T) or false (F)
1. The synchronous motor can be implemented to correct or improve the power factor of three-phase industrial circuits, thereby reducing operating costs. 2. A squirrel-cage, or amortisseur, winding is provided for starting because the synchronous motor is not self-starting without this feature. 3. A synchronous motor must always be started as a three-phase AC induction motor with the DC field excitation connected. 4. With normal full-field excitation of a synchronous motor, the power factor has a peak value of unity, or 100%, and the AC stator current is at its highest value. 5. When starting synchronous motors of larger sizes through a starting compensator or an automatic starter, the voltage applied to the motor terminals at the instant of start is about half the value of the rated line voltage, and the starting surge of current is limited.
Describe the basic construction of a simple planetary gear set.
What will be an ideal response?
Views called portion views are used when symmetrical objects are shown in a limited space.
Answer the following statement true (T) or false (F)
Compare two refrigerators: Refrigerator A costs $500; Refrigerator B costs $650. A uses $0.70 per day ($255.50 per year) and B uses $0.45 of electricity per day ($165.25 per year); both have a life expectancy of 10 years. Which has the lower life-cycle cost?
What will be an ideal response?