Technician A says the cathode ray tube (CRT) in an oscilloscope is like a very fast-reacting voltmeter. Technician B says the upward voltage traces on an oscilloscope screen indicate a specific length of time.
A. A only
B. B only
C. both A and B
D. neither A nor B
Answer: A
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Calculate the weight, in grams, of a piece of steel round stock that has a radius of 7.8 cm and a height of 37.6 cm. One cubic centimeter of steel equals 7.748 grams. Round the answer to the nearest hundredth.
What is the minimum width of support straps used to hang flexible ducts?
a. 1/4 inch b. 1 inch c. 1-1/2 inches d. 2 inches
The American population in 1900 can best be described as
A. ethnically and racially mixed. B. reaching nearly 76 million people. C. one in seven people were foreign-born. D. beset with increasingly complex social and economic problems. E. All of these choices are correct.
In a purely inductive circuit, the current waveform lags the voltage waveform by _____
a. 0 degrees b. 45 degrees c. 90 degrees d. 180 degrees