Preboards: Day 2 Concepts

Question 1

A unit operation is exemplified by the process of

Answer 1

Desorption

Question 2

Zirconia probe is used for the continuous measurement of __________ flue gases going out of the furnace.

Answer 2

oxygen in

Question 3

Typical specifications for design stipulate the gain margin and phase margin to be respectively

Answer 3

> 1.7 and > 30°

Question 4

Higher efficiency in the combustion of solid fuel cannot be achieved by

Answer 4

keeping the flue gas exhaust temperature very high.

Question 5

In flue gas analysis by Orsat’s apparatus, carbon monoxide is absorbed by

Answer 5

cuprous chloride

Question 6

The minimum baffle height should be

Answer 6

twice the impeller diameter.

Question 7

Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Answer 7

Radiation/infrared pyrometer

Question 8

The normal range of velocity of water in pipes is __________ m/sec.

Answer 8

1-2

Question 9

Removable connection of tubes to tube sheet is called

Answer 9

ferrule

Question 10

What is the slope of the operating line in the rectifying section of a distillation column?

Answer 10

∞

Question 11

For a given design of bubble cap, the number of bubble caps to be used per tray is set by the

Answer 11

allowable gas velocity through the slots.

Question 12

The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.

Answer 12

orifice

Question 13

The function of manholes provided in the shell of a distillation column is to

Answer 13

give access to the individual trays for cleaning, maintenance and installation.

Question 14

__________ closure is the weakest enclosure for cylindrical

Answer 14

Conical or flat plate

Question 15

Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always

Answer 15

less than arithmetic mean value.

Question 16

Which of the following reactions occurring during coal
gasification is called the Neumann reversal reaction

Answer 16

2CO = C + CO2

Question 17

The drug used in contraceptives is

Answer 17

mestranol

Question 18

Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.

Answer 18

isothermal

Question 19

High __________ is an undesirable property for a good
refrigerant.

Answer 19

viscosity

Question 20

Fundamental principle of refrigeration is based on the __________ law of thermodynamics.

Answer 20

second

Question 21

Degrees of freedom at triple point will be

Answer 21

0

Question 22

In distillation, overhead product contains

Answer 22

any number of components

Question 23

The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always

Answer 23

> 1

Question 24

Pick out the wrong statement. (Packed towers)

Answer 24

Diameter of randomly packed tower is normally more
than 1.2 meters.

Question 25

In turbulent flow, the

Answer 25

Shear stresses are generally larger than in a similar laminar flow

Question 26

__________ flow means the flow of incompressible fluid with no shear.

Answer 26

Potential

Question 27

A negative gain margin expressed in decibels means a/an __________ system.

Answer 27

unstable

Question 28

Power number is the ratio of

Answer 28

drag stress to inertial stress.

Question 29

Response of a system to a sinusoidal input is called __________ response

Answer 29

frequency

Question 30

Which of the following is used to set the diameter of the distillation column?

Answer 30

Allowable vapor velocity.

Question 31

Pick out the first order system from among the following.

Answer 31

Mercury in glass thermometer kept in boiling water.

Question 32

The function of a transducer is to

Answer 32

convert the primary signal into a more useful quantity, usually an electric impulse.

Question 33

Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?

Answer 33

Chromel-constantan.

Question 34

Select the correct statement from the following: (IPC)

Answer 34

The amplitude ratio of a pure capacity process is inversely proportional to frequency

Question 35

Bakelite is

Answer 35

same as thermosetting phenol-formaldehyde.

Question 35

__________ paper is used in the manufacture of newsprint paper.

Answer 35

Groundwood

Question 36

Glycerine is a by-product of the __________ industry.

Answer 36

soap

Question 37

Response of a linear control system for a change in set point is called

Answer 37

servo problem

Question 38

Hot wire anemometer is used for the measurement of

Answer 38

flow rates of fluids.

Question 39

Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.

Answer 39

more than