Which of the following is a spread spectrum technique that employs mathematical algorithms to recover lost data bits?
A. frequency hopping
B. direct sequence
C. narrow band
D. wide band
Answer: B
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Transformers in which the primary and secondary voltages are 180 degrees out of phase are known as _____.
a. unlike-wound transformers b. like-wound transformers c. unequal transformers d. step-up transformers
Which of the following is true?
A) There are more calories in a 3 oz. cooked portion of pork than lamb. B) A 3 oz. cooked portion of lamb has more zinc than beef. C) Neither are true.
(a) Show that for a bandpass filter,  figure 1.png)
where B = bandwidth of the filter and ?? is the center frequency. (b) Similarly, show that for a bandstop filter,  figure 2.png)
What will be an ideal response?
Which compressor has a piston that is driven up and down in the cylinder by a connecting rod and crankshaft?
A) A nonpositive-displacement compressor B) An open drive compressor C) A hermetic compressor D) A reciprocating compressor