4Q2223

Question 1

Equivalent diameter of a particle is the diameter of the sphere having the same

Ratio of surface to volume as the actual volume
Ratio of volume to surface as the particle
Volume as the particle
None of these

Answer 1

Ratio of surface to volume as the actual volume

Question 2

Fugacity and pressure are numerically not equal for the gases

At low temperature and high pressure
At standard state
In ideal state

Answer 2

Both At low temperature and high pressure
and At standard state

Question 3

A bypass stream in a chemical process is useful, because it

Facilitates better control of the process
Improves the conversion
Increases the yield of products
None of these

Answer 3

Facilitates better control of the process

Question 4

Linde gas liquefaction process employs cooling by

Answer 4

throttling

Question 5

Claude’s liquefaction employs the colling of gases by

Answer 5

expansion in an engine

Question 6

The quantitative effect of temperature on chemical equilibrium is given by the

Vant-Hoff equation
Le-Chatelier’s principle
Arhenius equation
None of these

Answer 6

Vant-Hoff equation

Question 7

Fugacity is a measure of the

Escaping tendencies of the same substance in different phases of a system
Relative volatility of a mixture of two miscible liquids
Behaviour of ideal gases
None of these

Answer 7

Escaping tendencies of the same substance in different phases of a system

Question 8

Ideal refrigeration cycle is

Same as Carnot cycle
Same as reverse Carnot cycle
Dependent on the refrigerant’s properties
The least efficient of all refrigeration processes

Answer 8

Same as reverse Carnot cycle

Question 9

The drag coefficient of a rigid spherical particle generally decreases linearly with increasing Reynolds number for:
Re = 1
Re < 0.1
Re < 10,000
Re > 10

Answer 9

Re < 0.1 (9th Ed, Fig 6-52)

Question 10

In distillation, which of the following occurs as a consequence of increasing the reflux ratio?

Answer 10

the distillate product decreases

Question 11

What happens to the operating line of an absorption column as we increase the mass flow rate of the absorbent?

Answer 11

the operating line approached verticality

Question 12

Given Fixed Capital Investment for predominantly solids processing plants, what is the Lang factor?

Answer 12

4.3 (9th Ed, Table 9-10)

Question 13

What sodium compound is known as an oxygen scavenger that prevents corrosion

Answer 13

sodium sulfite

Question 14

What type of corrosion is common to metals in environments containing chloride or other ions?

Answer 14

pitting corrosion (9th Ed, Page 25-6)

Question 15

Steeping of tea is what type of separation process?

Answer 15

solid-liquid extraction

Question 16

What is the internal combustion engine cycle that requires spark ignition?

Answer 16

Otto cycle

Question 17

Which value of n results in a higher value for a polytropic process following pV^n?
0
1
γ
R

Answer 17

γ

Question 18

The equilibrium constant of chemical reaction __________ in the presence of catalyst.

Increases
Decreases
Remains unaffected
Can either increase or decrease (depends on the type of catalyst)

Answer 18

Remains unaffected

Question 19

As the number of CSTRs connected in series approaches infinity, the cascade of CSTRs approaches the performance of

Answer 19

a PFR

Question 20

What is the effect of adding a superheater in a Rankine cycle?

Answer 20

increases mean temperature and thermal efficiency

Question 21

What is the difference between residual and excess properties?

Answer 21

Residual properties are for gases and Excess properties are for solutions

Question 22

Screw threads were first standardized by

Answer 22

Henry Maudslay (1800s) followed by William Sellers (1864)