Select a typical plastic product manufacturing process.
A. injection molding
B. machining
C. thermoforming
D. both a and c
Answer: D
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A 220 V, 1500 rpm, 11.6 A (armature current), separately excited motor is controlled by a single-phase, full-wave SCR converter. The armature resistance of the motor is 2 ?. The ac source voltage is 230 V (rms) 60 Hz. Enough inductance is added to ensure continuous conduction for any torque greater than 25% of rated value. (Ignore the the rotational losses.)
a. Calculate the triggering angle for a speed of 1000 rpm at rated torque. b. Assuming that the torque is a fan-type, calculate the triggering angle for a motor speed of 900 rpm. c. Sketch the speed-torque characteristics showing the operating points of cases (a) and (b).
A "hank" of wool is equal to 560 yards of yarn that theoretically can be woven from one
pound of scoured wool. A. True B. False
In the metric system, what is the prefix for 1000?
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