A person smokes one cigarette in 60 sec in a waiting room. The concentration of smoke particles in the inhaled smoke is 1015 particles/m3. The smoke particles have a diameter of 0.2 ?m and a density of 0.8 g/ml. If the smoker breathes in air at a rate of 5 L per minute, what is the inhalation rate of smoke particles in mg/m3 during the time he or she is smoking?
What will be an ideal response?
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In the brushless DC exciter, the commutator of a conventional direct-connected exciter is replaced with a threephase, bridge-type, ____.
a. solid-state rectifier b. controlled rectifier c. direct transformer d. small rectifier
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Crowns are usually built during the construction of the _____.
a. trenches b. runoff barriers c. subgrade d. final bedding
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Describe the 500 mile service.
What will be an ideal response?
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Appliance circuits can often be broken down into simple series circuits for evaluation purposes.
Answer the following statement true (T) or false (F)
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