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Bed bugs are parasitic insects in the genus Cimex that feed exclusively on blood. Cimex lectularius, the common bed bug, is the best known as it prefers to feed on human blood. The name bed bug derives from the preferred habitat of Cimex lectularius: warm houses and especially near or inside beds or other sleep areas. Bed bugs are mainly active at night, but are not exclusively nocturnal. They usually feed on their hosts without being noticed. A number of adverse health effects may results from bed bug bites, including skin rashes, psychological effects, and allergic symptoms. Bed bugs are not known to transmit any pathogens as disease vectors. Certain signs and symptoms suggest the presence of bed bugs; finding the adult insects confirms the diagnosis. Assuming the information in the given paragraph is true, choose the correct statement.
Slugging occurs in a fluidised bed, if the bed is
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below:
Δ P/L = 375 × 103 VOM + 10.94 × 106 V2OM (SI units)
If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed?
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m3) is to be fluidised by water (density 1000 kg/m3). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is
If "blanket" is called "towel","towel" is called "bed sheet", "bed sheet" is called "pillow" ,"pillow" is called "bed" and "bed" is called "table". What is used to cover bed?
The statements below are followed by two conclusions labeled I and II. Assuming that the information in the statements is true, even if it appears to be at variance with generally established facts, decide which conclusion(s) logically and definitely follow(s) from the information given in the statements. Statements: All bed is bed sheet. No bed is blanket. Some blanket is comforter Conclusion I: No comforter is bed. Conclusion II: Some blanket is bed sheet.
Consider the following statements for fluidized bed boilers: 1. Fluidized bed boilers produce steam from fossil and waste fuels by using a technique called fluidized bed combustion. 2. Cyclone separators are gas cleaning devices that utilize the centrifugal force created by a spinning gas stream to separate particles from a gas. 3. In a pressurized fluidized bed boiler, the combustion process takes place in a pressurized environment resulting in a compact furnace and improved combustion efficiency. Which of the above statements are correct?
Harry makes a bed in 20 days while Ron takes 25 days. Harry starts to make a bed and works for 5 days alone, after 5 days Ron joins and they work together for 4 days. Then a third person Tom joins and they three work together for 3 days and complete the bed. In how many days can Tom complete a bed alone?
What can be done in order to prevent slugging in the fluidized bed?