Process Equipment and Plant Design

251. Speed of industrial paddle agitator ranges from _________ rpm.

1. 1 to 5
2. 20 to 100
3. 500 to 750
4. 1000 to 2000

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252. Speed of the drum of the rotary vacuum filter normally ranges from _________ rpm.

1. 0.1 to 2
2. 5 to 7
3. 3 to 8
4. 8 to 15

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253. Spherical shaped pressure vessel is considered to be the most ideal, because it can

1. Withstand higher pressure for a given metallic shell thickness
2. Be fabricated very easily
3. Be designed without wind load considerations
4. Be supported very easily

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254. Stage efficiency for packed tower varies with the

1. Type & size of packing
2. Fluid rates and fluid properties
3. Operating pressure and column diameter
4. All (A), (B) and (C)

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255. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effects in evaporation

1. Increases capacity
2. Increases economy
3. Does not affect the capacity
4. Both 'b' & 'c'

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256. Steam is preferred to be used as a heating medium in heat exchangers, because of its

1. Low cost
2. High latent heat
3. Non-corrosive condensate
4. High film co-efficient

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257. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about _________ kcal/hr.m².°C.

1. 1250
2. 2500
3. 7500
4. 15000

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258. The absorption factor is defined as (where, S₁ = slope of the equilibrium curve, S₂ = slope of the operating line)

1. S₁/S₂
2. S₁.S₂
3. S₂/S₁
4. 1/S₁.S₂

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259. The approximate liquid depth in an agitation tank is equal to (where, d = tank diameter)

1. 0.5 d
2. 0.75 d
3. d
4. 2 d

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260. The average velocity in the tubes of a 1-4 heat exchanger is _________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate.

1. 2
2. 43862
3. 4
4. 43922

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