A radioactive mass emits particles according to a Poisson process. The probability that no particles will be emitted in a two-second period is 0.5.

a. What is the probability that no particles are emitted in a four-second period?
b. What is the probability that no particles are emitted in a one-second period?
c. What is the mean number of particles emitted per second?


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If an air-cooled condenser is located on a 95°F roof and the condenser saturation temperature is 150°F, which of the following is a possible scenario?

A. The system is overcharged. B. The condenser is clogged. C. The system is undercharged. D. Both a and b are correct.

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An unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth is called a ____.

a. conductive current b. ground fault c. current path d. grounded conductor

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A(n) ____ test ensures that the engine compression is high enough to heat the fuel–air mixture to a combustible level inside the engine’s combustion chamber.

a. expansion b. injection c. decompression d. compression

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Which type of air spring is mounted on a pedestal?

A. Single convoluted B. Double convoluted C. Reversible sleeve D. Jounce block

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