Refresher 1 Flashcards
Which of the following is the dynamic characteristic of an instrument
fidelity
Which of the following is the undesirable dynamic characteristic of an instrument
time lag
Removable connection of tubes to the tube sheet is called
ferrule
A stuffing box is used for
Prevention of fluid leakage around moving parts
Pick out the wrong statement pertaining to the design of a basket type evaporator
Speed of the drum of the rotary vacuum filter normally ranges from __________rpm
0.1 to 2
Pick out the wrong statement pertaining to a shell and tube heat exchanger
The LMTD correction factor (FT) is applied in ___________ heat exchangers
All multipass
For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be _______ mm
23
At equal mass velocities, the values of film coefficients of gases as compared to that for liquids are generally
lower
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be
More than that for fluid flow
Back-trapping in a DISTILLATION column results due to
Excessive liquid gradient over the tray
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be
More than that for fluid flow
The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _________ stress
ultimate
The stress developed in a material without any permanent set is called the
Elastic limit
The ratio of lateral strain to linear strain is termed as the
Poisson’s ratio
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure
At the inner surface
Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the
Ultimate stress to working stress
The ends of a cylindrical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure
ellipsoidal
generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than ________ mm
30
Joint efficiency (J) for a seamless pipe is
1
