coaching d2

Question 1

A thermocouple senses temperature based on the
• Nernst Effect
• Seebeck Effect
• Maxwell Effect
• Peltier Effect

Answer 1

Seebeck Effect

Question 2

For a packed bed reactor, the presence of a long tail in the residence time distribution curve is an indication of
• ideal plug flow
• bypass
• dead zone
• channeling

Answer 2

dead zone

Question 3

Zirconia probe is used for the continuous measurement of ________ flue gases going out of the furnace.
• carbon dioxide in
• carbon monoxide in
• temperature of
• oxygen in

Answer 3

oxygen in

Question 4

Bubble column reactor has
• large height to diameter ratio
• large diameter to height ratio
• small height to diameter ratio
• small diameter to height ratio

Answer 4

large height to diameter ratio

Question 5

A reactor that combines liquid phase operation with catalytic activity is referred to as a
• A vapor phase reactor
• Pot type reactor
• A liquid phase reactor
• A liquid phase catalytic reactor

Answer 5

A liquid phase catalytic reactor

Question 6

Which device uses a converging-diverging nozzle to measure flow rate based on pressure difference
• Pitot tube
• Rotameter
• Venturi meter
• Orifice meter

Answer 6

Venturi meter

Question 7

Failure of rivets due to transverse force is called
• tearing
• shearing
• tearing of the plate across a row
• none of these

Answer 7

shearing

Question 8

For a distillation column at total reflux, what is the slope of the enriching operating line in the McCabe-Thiele Plot?
• 0
• Infinity
• 1
• Negative

Answer 8

1

Question 9

Which of the following is used to set the diameter of the distillation column?
• Number of theoretical plates
• Static submergence
• Allowable vapor velocity
• Length of straight rectangular weir on crossflow tray

Answer 9

Allowable vapor velocity

Question 10

A reactor design that promotes gas-liquid contact by maximizing vertical flow uses a
• large height to diameter ratio
• large diameter to height ratio
• small height to diameter ratio
• small diameter to height ratio

Answer 10

large height to diameter ratio

Question 11

Which gas is commonly monitored in flue gases to assess combustion efficiency and detect incomplete burning?
• carbon dioxide in
• carbon monoxide in
• temperature of
• oxygen in

Answer 11

carbon monoxide in

Question 12

Which reactor configuration would likely reduce vertical mixing and gas residence time?
• large height to diameter ratio
• large diameter to height ratio
• small height to diameter ratio
• small diameter to height ratio

Answer 12

large diameter to height ratio

Question 13

The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the
• equal sized reactors are the best
• smaller reactor should come first
• larger reactor should come first
• none of these

Answer 13

smaller reactor should come first

Question 14

The toxicity of organic acids to cells
• enhances as the pH falls
• is not affected by pH
• reduces as the pH falls
• is highest at pH 7.0

Answer 14

enhances as the pH falls

Question 15

A failure mode where the plate material ruptures along a line of rivets is known as
• tearing
• shearing
• tearing of the plate across a row
• none of these

Answer 15

tearing of the plate across a row

Question 16

The distance between the center of a rivet hole to the nearest edge of the plate is called
• pitch
• back pitch
• margin
• none of these

Answer 16

margin

Question 17

Fluidized bed reactor is characterized by
• uniformity of temperature
• very small pressure drop
• comparatively smaller equipment
• absence of continuous catalyst regeneration facility

Answer 17

uniformity of temperature

Question 18

A flow pattern where fluid follows preferred paths, reducing mixing and contact, is called
• ideal plug flow
• bypass
• dead zone
• channeling

Answer 18

channeling

Question 19

The local heat transfer coefficient in film-type condensation over a vertical tube is
• inversely proportional to local film thickness
• directly proportional to local film thickness
• equal to local film thickness
• independent of local film thickness

Answer 19

inversely proportional to local film thickness

Question 20

A reactor with complete mixing and maximum dispersion (CSTR) has a dispersion number of
• 0
• 1
• ∞
• -1

Answer 20

∞

Question 21

A furnace sensor that tracks thermal energy rather than chemical composition measures the
• carbon dioxide in
• carbon monoxide in
• temperature of
• oxygen in

Answer 21

temperature of

Question 22

A batch reactor used for small-scale operations with manual control is often called a
• A vapor phase reactor
• Pot type reactor
• A liquid phase reactor
• A liquid phase catalytic reactor

Answer 22

Pot type reactor

Question 23

The distance between rows of rivets measured perpendicular to the direction of the row is called
• pitch
• back pitch
• margin
• none of these

Answer 23

back pitch

Question 24

The synthesis of proteins and metabolism in biological objects occur in the presence of biocatalyst called (erroneous)
• a ferment or an enzyme
• fungi
• hemoglobin
• none of these

Answer 24

fungi

Question 25

Which effect is associated with electromagnetic field equations, not thermal sensing? • Nernst Effect • Seebeck Effect • Maxwell Effect • Peltier Effect

Answer 25

Maxwell Effect

Question 26

In film condensation, increasing the film thickness generally leads to • higher heat transfer coefficient • lower heat transfer coefficient • constant heat transfer • no change in heat transfer

Answer 26

lower heat transfer coefficient

Question 27

A brief phase before steady drying begins, often involving temperature stabilization, is called the • initial adjustment period • constant rate period • falling rate period • final drying period

Answer 27

initial adjustment period

Question 28

Among common shapes, which has the lowest sphericity value? • sphere • cylinder • cube • tetrahedron

Answer 28

cube

Question 29

The point where the operating line touches the equilibrium curve in distillation is called the • pinch point • feed point • dew point • bubble point

Answer 29

pinch point

Question 30

At minimum reflux ratio, the number of trays required for separation tends to be • finite • infinite • zero • minimal

Answer 30

infinite

Question 31

The distance between adjacent rivets in the same row is referred to as • pitch • back pitch • margin • none of these

Answer 31

pitch

Question 32

Which of the following packings will have the lowest flooding velocity in a packed column? • Ceramic Berl saddle • 25-mm ceramic Raschig ring • 25-mm plastic Raschig ring • 16-mm metal Pall ring

Answer 32

25-mm ceramic Raschig ring

Question 33

What is the dispersion number for a plug flow reactor? • 0 • 1 • ∞ • -1

Answer 33

0

Question 34

Which of the following types of reactors is the safest from operation point of view? (erroneous) • A vapor phase reactor • Pot type reactor • A liquid phase reactor • A liquid phase catalytic reactor

Answer 34

A vapor phase reactor

Question 35

A reactor design that minimizes resistance to flow and maintains low energy consumption has • uniformity of temperature • very small pressure drop • comparatively smaller equipment • absence of continuous catalyst regeneration facility

Answer 35

very small pressure drop

Question 36

A reactor operating with gases at high temperature and pressure poses higher safety risks than • A vapor phase reactor • Pot type reactor • A liquid phase reactor • A liquid phase catalytic reactor

Answer 36

A vapor phase reactor

Question 37

At minimum reflux, vapor flow in the column is • maximum • moderate • minimum • zero

Answer 37

minimum

Question 38

The liquid level maintained above the tray to ensure proper vapor-liquid contact is called • Number of theoretical plates • Static submergence • Allowable vapor velocity • Length of straight rectangular weir on crossflow tray

Answer 38

Static submergence

Question 39

In distillation, which is not true at minimum reflux ratio? • The q-line and the equilibrium curve intersect at the pinch point • There is an infinite number of trays • Reboiler and condenser sizes are maximum • Vapor flow in the tower is minimum

Answer 39

Reboiler and condenser sizes are maximum

Question 40

A rivetted joint does not fail by _________ of rivets. (erroneous?) • tearing • shearing • tearing of the plate across a row • none of these

Answer 40

none of these

Question 41

A compact reactor with minimal vertical space and reduced bubble rise path would have a • large height to diameter ratio • large diameter to height ratio • small height to diameter ratio • small diameter to height ratio

Answer 41

small height to diameter ratio

Question 42

For reactions with order less than one, the ideal sequence of mixed reactors is • equal sized reactors are the best • smaller reactor should come first • larger reactor should come first • none of these

Answer 42

larger reactor should come first

Question 43

In batch distillation, as time progresses, the mole fraction of the more volatile component in the distillate typically • increases • remains constant • decreases • fluctuates randomly

Answer 43

decreases

Question 44

The effect involving heat absorption or emission at a junction when current flows is called the • Nernst Effect • Seebeck Effect • Maxwell Effect • Peltier Effect

Answer 44

Peltier Effect

Question 45

The local velocity of a fluid along a streamline can be measured by • Pitot tube • Rotameter • Venturi meter • Orifice meter

Answer 45

Pitot tube

Question 46

In the drying of non-dissolving solids at constant drying conditions, the internal movement of moisture in the solid has a dominant effect on the drying rate during • the initial adjustment period only • the constant rate period only • the falling rate period only • both the initial adjustment and constant rate periods

Answer 46

the falling rate period only

Question 47

Which effect describes the generation of voltage due to a temperature gradient in a conductor? • Nernst Effect • Seebeck Effect • Maxwell Effect • Peltier Effect

Answer 47

Nernst Effect

Question 48

A packing type made of ceramic and shaped like a saddle is known as • Ceramic Berl saddle • 25-mm ceramic Raschig ring • 25-mm plastic Raschig ring • 16-mm metal Pall ring

Answer 48

Ceramic Berl saddle

Question 49

The flow rate of a fluid in a vertical tapered tube is typically measured using a • Pitot tube • Rotameter • Venturi meter • Orifice meter

Answer 49

Rotameter

Question 50

If drying rate slows down due to internal moisture diffusion limitations, the process is in the • initial adjustment period • constant rate period • falling rate period • equilibrium period

Answer 50

falling rate period

Question 51

During which drying period does surface evaporation dominate and internal moisture movement play a minimal role? • initial adjustment period • constant rate period • falling rate period • all periods

Answer 51

constant rate period

Question 52

Sphericity is defined as the ratio of surface area of a sphere (with same volume) to that of the particle. Which shape has the highest sphericity? • sphere • cylinder • cube • irregular particle

Answer 52

sphere

Question 53

A thin plate with a hole used to measure flow rate by causing a pressure drop is called a • Pitot tube • Rotameter • Venturi meter • Orifice meter

Answer 53

Orifice meter

Question 54

Which packing material tends to have the highest flooding velocity due to its open structure? • Ceramic Berl saddle • 25-mm ceramic Raschig ring • 25-mm plastic Raschig ring • 16-mm metal Pall ring

Answer 54

16-mm metal Pall ring