Variable-speed control for small motors is accomplished by controlling the amount of ____ applied to the motor or by inserting impedance in series with the stator winding.
a. current
b. pressure
c. voltage
d. amperage
c. voltage
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One strong prejudice inhibiting women from obtaining higher education in the early 19th century was the belief that
A. they would gain political and economic power through education. B. women were inherently conservative and opposed to social reform. C. children should grow up without the influence of educated women. D. the Constitution prohibited women from attending colleges. E. too much learning would injure women's brains, ruin their health, and make them unfit for marriage.
The yolk of an egg is made up primarily of:
a. protein c. lipid b. water d. carbohydrate
An output gate is connected to four input gates; the circuit does not function. Preliminary tests with a DMM indicate that power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different IC's. Which instrument will best help isolate the problem?
A) Logic probe B) Logic analyzer C) Oscilloscope D) Current tracer
What is the time constant for a 50 mH inductor and 5 k? resistor connected in series?
A) 250 s B) 100 s C) 10 ?s D) 10 ms