Question 1

The working of Fluid energy mill is based on principle of
A)Impact
B)Attrition
C)Cutting
D)Both a & b

Accepted Answer

The fluid energy mill works on the principle of both impact and attrition. The high-velocity particles collide with each other and the walls of the chamber, causing size reduction.

Question 2

Size reduction is also known as:
A)Comminution
B)Pulverization
C)Diminution
D)All of the above

Accepted Answer

A

Question 3

The bell crank lever arrangement is major part of which of the following………:
A)Cyclone separator
B)Edge runner Mill
C)End runner Mill
D)Bag filter

Accepted Answer

D

Question 4

The hammer mill operates on the principle of:
A)Impact
B)Attrition
C)Compression
D)Cutting

Accepted Answer

The hammer mill operates primarily on the principle of impact, where the material is struck by hammers to break it into smaller pieces.

Question 5

Ball Mill operates at the speed of?
A)Low speed
B)High speed
C)Optimum speed
D)All of the above

Accepted Answer

A ball mill operates at an optimum speed to ensure efficient grinding and to prevent excessive wear and tear on the mill and its components.

Question 6

Fluid Energy Mill works on the principle of:
A)Impact & Attrition
B)Rotor & Stator
C)Compression
D)Attrition

Accepted Answer

Fluid Energy Mill operates on the principle of Impact and Attrition, utilizing high-speed particle collisions and attrition to achieve size reduction.

Question 7

Fibrous drugs are milled by using:
A)Cutter Mill
B)Hammer Mill
C)Fluid Energy Mill
D)Ball Mill

Accepted Answer

Cutter mills are used for milling fibrous materials as they can cut through the fibers effectively.

Question 8

Mills are not suitable for Friable (heat sensitive) materials?
A)Cutter Mill
B)Hammer mill
C)Colloidal Mill
D)All of the above

Accepted Answer

Mills like Cutter Mill, Hammer Mill, and Colloidal Mill are not suitable for friable, heat-sensitive materials because these methods involve mechanical forces that can generate heat and cause degradation of such materials.

Question 9

In Azeotropic distillation __________ remains low:
A)Heat
B)Volatility
C)Relativity Volatility
D)None of these

Accepted Answer

In azeotropic distillation, the relative volatility of the components in the azeotrope is low, meaning there is little difference in the boiling points of the components, which makes their separation by conventional distillation difficult.

Question 10

In Vacuum Distillation, Substance boils at a/an:
A)Exact temperature
B)temperature slightly above its boiling point
C)temperature below its boiling point
D)High Pressure

Accepted Answer

In vacuum distillation, the pressure above the liquid mixture to be distilled is reduced, which decreases the boiling points of the components of the mixture. This allows the substance to boil at a temperature below its normal boiling point.

Question 11

In the fractionating column of fraction distillation, as we go higher in the column the…..?
A)Temperature becomes lower
B)Temperature becomes higher
C)minimum absorption occurs
D)Sublimation risk increases

Accepted Answer

In a fractionating column used in fractional distillation, the temperature decreases as one moves higher up the column. This temperature gradient is essential for separating components based on their boiling points.

Question 12

Rate of evaporation is______:
A)directly proportional to temperature of liquid
B)inversely proportional to temperature of liquid
C)independent of temperature of liquid
D)directly proportional to humidity of surrounding air

Accepted Answer

The rate of evaporation increases with the temperature of the liquid because higher temperatures provide more energy for the liquid molecules to overcome intermolecular forces and transition into the gas phase.

Question 13

Which of the following factors do not affect the rate of evaporation?
A)Temperature of liquid
B)Humidity of surrounding air
C)Depth of liquid
D)Surface of liquid

Accepted Answer

The depth of the liquid does not affect the rate of evaporation. Evaporation occurs at the surface of the liquid, so factors like temperature, humidity, and surface area directly influence the rate, whereas the depth of the liquid does not play a direct role in the rate of evaporation.

Question 14

Which of the following is a characteristic of a horizontal tube evaporator?
A)Agitation is provided only by bubbles leaving the evaporator as vapor
B)The tube bundle is arranged vertically, with the solution inside the tubes condensing outside
C)To handle viscous solution a pump is used to force liquid upwards
D)Also called short vertical tube evaporator

Accepted Answer

Agitation in a horizontal tube evaporator is primarily provided by the bubbles that form and leave the evaporator as vapor. This natural circulation helps in the heat transfer process.

Question 15

The (emissivity) of a black body is:
A)1
B)1.5
C)2
D)None

Accepted Answer

The emissivity of a black body is 1, meaning it is a perfect emitter of radiation in all wavelengths.

Question 16

Mean free path is associated with which type of distillation?
A)Steam
B)Evaporative
C)Azeotropic
D)Fractional

Accepted Answer

Mean free path is a concept associated with molecular movement and separation, which is a fundamental principle in fractional distillation. In fractional distillation, components of a mixture are separated based on differences in their boiling points, and the mean free path plays a role in the efficiency of this separation process.

Question 17

Which one of the following rate is observed in mixing of solids?
A)First order law
B)zero order law
C)Second order law
D)none

Accepted Answer

The answer of Which one of the following rate is...

Question 18

Unit of the rate of heat transfer is
A)Joule
B)Newton
C)Pascal
D)Watt

Accepted Answer

The rate of heat transfer is measured in Watts (W), where one Watt is equivalent to one Joule per second (J/s). This unit measures how quickly energy is transferred as heat.

Question 19

Which type of mixture is easily formed?
A)Positive
B)Negative
C)Neutral
D)Ampholytic

Accepted Answer

Positive mixtures are easily formed because they involve components that have a natural affinity or attraction to each other, leading to spontaneous mixing.

Question 20

Mechanism not used in solid-solid Mixing:
A)Connective
B)Shear Mixing
C)Diffusion
D)Tumbling

Accepted Answer

The answer of Mechanism not used in solid-solid Mixing:
A)Connective
B)Shear Mixing
C)Diffusion
D)Tumbling...

Quiz 1: Principles and Mechanisms in Milling, Distillation, and Mixing Processes

The working of Fluid energy mill is based on principle of

Size reduction is also known as:

The bell crank lever arrangement is major part of which of the following………:

The hammer mill operates on the principle of:

Ball Mill operates at the speed of?

Fluid Energy Mill works on the principle of:

Fibrous drugs are milled by using:

Mills are not suitable for Friable (heat sensitive) materials?

In Azeotropic distillation __________ remains low:

In Vacuum Distillation, Substance boils at a/an:

In the fractionating column of fraction distillation, as we go higher in the column the…..?

Rate of evaporation is______:

Which of the following factors do not affect the rate of evaporation?

Which of the following is a characteristic of a horizontal tube evaporator?

The (emissivity) of a black body is:

Mean free path is associated with which type of distillation?

Which one of the following rate is observed in mixing of solids?

Unit of the rate of heat transfer is

Which type of mixture is easily formed?

Mechanism not used in solid-solid Mixing: