Preboards: Day 2 Concepts Flashcards
A unit operation is exemplified by the process of
Desorption
Zirconia probe is used for the continuous measurement of __________ flue gases going out of the furnace.
oxygen in
Typical specifications for design stipulate the gain margin and phase margin to be respectively
> 1.7 and > 30°
Higher efficiency in the combustion of solid fuel cannot be achieved by
keeping the flue gas exhaust temperature very high.
In flue gas analysis by Orsat’s apparatus, carbon monoxide is absorbed by
cuprous chloride
The minimum baffle height should be
twice the impeller diameter.
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?
Radiation/infrared pyrometer
The normal range of velocity of water in pipes is __________ m/sec.
1-2
Removable connection of tubes to tube sheet is called
ferrule
What is the slope of the operating line in the rectifying section of a distillation column?
∞
For a given design of bubble cap, the number of bubble caps to be used per tray is set by the
allowable gas velocity through the slots.
The shell side pressure drop in a shell and tube heat exchanger is maximum for __________ baffle.
orifice
The function of manholes provided in the shell of a distillation column is to
give access to the individual trays for cleaning, maintenance and installation.
__________ closure is the weakest enclosure for cylindrical
Conical or flat plate
Log mean temperature difference in case of multi-pass shell and tube heat exchanger is always
less than arithmetic mean value.
Which of the following reactions occurring during coal
gasification is called the Neumann reversal reaction
2CO = C + CO2
The drug used in contraceptives is
mestranol
Maximum work that could be secured by expanding the gas over a given pressure range is the __________ work.
isothermal
High __________ is an undesirable property for a good
refrigerant.
viscosity
Fundamental principle of refrigeration is based on the __________ law of thermodynamics.
second
Degrees of freedom at triple point will be
0
In distillation, overhead product contains
any number of components
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
> 1
Pick out the wrong statement. (Packed towers)
Diameter of randomly packed tower is normally more
than 1.2 meters.
In turbulent flow, the
Shear stresses are generally larger than in a similar laminar flow
__________ flow means the flow of incompressible fluid with no shear.
Potential
A negative gain margin expressed in decibels means a/an __________ system.
unstable
Power number is the ratio of
drag stress to inertial stress.
Response of a system to a sinusoidal input is called
__________ response
frequency
Which of the following is used to set the diameter of the distillation column?
Allowable vapor velocity.
Pick out the first order system from among the following.
Mercury in glass thermometer kept in boiling water.
The function of a transducer is to
convert the primary signal into a more useful quantity,
usually an electric impulse.
Which of the following thermocouples will give the highest output for the same value of hot and cold junction temperature?
Chromel-constantan.
Select the correct statement from the following: (IPC)
The amplitude ratio of a pure capacity process is inversely proportional to frequency
Bakelite is
same as thermosetting phenol-formaldehyde.
__________ paper is used in the manufacture of newsprint paper.
Groundwood
Glycerine is a by-product of the __________ industry.
soap
Response of a linear control system for a change in set point is called
servo problem
Hot wire anemometer is used for the measurement of
flow rates of fluids.
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.
more than
