What is the most common weld used in construction?
A. square-groove weld
B. fillet weld
C. U-groove weld
D. J-groove weld
Answer: B
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Answer the following statement(s) true (T) or false (F)
1. A frequency changer may be used to vary the speed of AC squirrel cage induction motors. 2. There is only one method used for one or more motors to obtain variable frequency from a fixed-frequency power source. 3. Variable-frequency power drives are used on many different types of conveyor systems. 4. Assembly lines make use of variable-frequency power drives. 5. Variable pitch systems are among the lowest-cost methods of achieving variable speed.
Which of the following may cause reduced production?
A. Improper cooling tower lineup B. Failure to treat cooling water chemically C. Improper chemical addition to the cooling tower D. Circulating cooling water through a heat exchanger with ruptured tubes
Answer the following statement(s) true (T) or false (F)
1. In the three-phase system, electrical energy originates from an alternator that has three main windings placed 180° apart. 2. A three-phase generator is smaller in physical dimensions than a single-phase generator. 3. The A and B phase voltages in a two-phase connection are designed to be equal. 4. The two-wattmeter method can be used in an unbalanced three-phase, four-wire system. 5. The power factor is the ratio of apparent power to true power.
Hydroponics will likely be a key element in enabling the world to feed and clothe its increasing human population in the next few decades
Indicate whether the statement is true or false