- (A) Decreasing its temperature
- (B) Increasing the volume of the vessel containing the solution
- (C) Diluting the solution
- (D) None of these
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- (A) Recycling in a process stream helps in utilising the valuable reactants to the maximum with minimum loss of reactants
- (B) The ratio of the quantity of a reactant present in the reactor feed of a recycling operation to the quantity of the same reactant entering the process as fresh feed is called combined feed ratio
- (C) Recycling in a process does not help in getting higher extent of reaction
- (D) Recycling is exemplified by refluxing back a part of the distillate to the distillation column to maintain the quantity of liquid within the column
- (A) Charle’s law
- (B) Dalton’s law of partial pressures
- (C) Avogadro’s hypothesis
- (D) Boyle’s law
- (A) 2
- (B) 1
- (C) 3
- (D) unpredictable
- (A) Atomic heat capacities of the crystalline solid elements are nearly constant and equal to 6.2 kcal/kg-atom according to the law of Petit and Dulong
- (B) Atomic heat capacities of all solid elements decrease greatly with decrease in temperature, approaching a value of zero at absolute zero temperature, when in the crystalline state
- (C) Generally, the heat capacities of compounds are lower in the liquid than in the solid state
- (D) The heat capacity of a heterogeneous mixture is an additive property, but when solutions are formed, this additive property may no longer exist
- (A) 1 BTU =453.6 calories
- (B) 1 BTU = 252 calories
- (C) 1 calorie = 252 BTU
- (D) 1 calorie = 453.6 BTU
- (A) Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks
- (B) Graphite refractories are also called plumbago refractories
- (C) Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28
- (D) Calcined magnesite is also called dead burnt magnesite
- (A) Refractories used in muffle furnace should have low thermal conductivity
- (B) The electrical resistivity of refractories drops rapidly with rise in temperature
- (C) For reducing spalling tendency, the refractory should be well fired and its porosity should be more
- (D) Refractoriness under load (RUL) of a refractory is always less than its refractoriness
- (A) In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used
- (B) Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing
- (C) In a sieve tray, the minimum hole diameter is equal to the tray thickness
- (D) In a stainless steel sieve tray, the minimum hole diameter is equal to 10 times the plate thickness
- (A) Plate efficiency increases with increase in superficial vapour velocity till entrainment limit
- (B) Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1"
- (C) Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value
- (D) None of these
