An air sonar detects the echo TOF from an object to be 10 milliseconds. The object range equals ___(x.xx) m.

Fill in the blank(s) with the appropriate word(s).


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Photo-operated devices fall into one of three categories. What are the categories?

What will be an ideal response?

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A ____________________ is a daily or periodic account of what you did when conducting your research

a. Research report c. Log book b. Project display d. Date book

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When the contacts on a contactor or motor starter begin to stick:

A) They should be replaced. B) They should be reconditioned using a file. C) They should be cleaned with contact cleaner. D) The voltage to the coil should be increased to strengthen the contactor.

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With three capacitors in series, the current lags the voltage by:

A) 30 degrees. B) 90 degrees. C) 45 degrees. D) none of the above.

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