Refresher 1

Question 1

Which of the following is the dynamic characteristic of an instrument

Answer 1

fidelity

Question 2

Which of the following is the undesirable dynamic characteristic of an instrument

Answer 2

time lag

Question 3

Removable connection of tubes to the tube sheet is called

Answer 3

ferrule

Question 3

A stuffing box is used for

Answer 3

Prevention of fluid leakage around moving parts

Question 4

Pick out the wrong statement pertaining to the design of a basket type evaporator

Answer 4

It is used for high viscosity liquor having large rate of scaling

Question 5

Speed of the drum of the rotary vacuum filter normally ranges from __________rpm

Answer 5

0.1 to 2

Question 6

The LMTD correction factor (FT) is applied in ___________ heat exchangers

Answer 6

All multipass

Question 7

For a 25 mm hole drilled in plates to be rivetted, the shank diameter of the rivet should be _______ mm

Answer 7

23

Question 8

At equal mass velocities, the values of film coefficients of gases as compared to that for liquids are generally

Answer 8

lower

Question 9

In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

Answer 9

More than that for fluid flow

Question 10

Back-trapping in a DISTILLATION column results due to

Answer 10

Excessive liquid gradient over the tray

Question 10

In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

Answer 10

More than that for fluid flow

Question 11

The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the _________ stress

Answer 11

ultimate

Question 12

The stress developed in a material without any permanent set is called the

Answer 12

Elastic limit

Question 13

The ratio of lateral strain to linear strain is termed as the

Answer 13

Poisson’s ratio

Question 14

Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure

Answer 14

At the inner surface

Question 15

Correct use of ‘factor of safety’ is very important in equipment design. It is defined as the ratio of the

Answer 15

Ultimate stress to working stress

Question 16

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

Answer 16

ellipsoidal

Question 16

generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than ________ mm

Answer 16

30

Question 17

Joint efficiency (J) for a seamless pipe is

Answer 17

1

Question 18

Pertain to what type of evaporator:
- the tube bundle is suspended on bracket
- there is no central downtake
- downtake is formed by the annular space between the bundle and the shell

Answer 18

Basket type evaporator

Question 19

Pick out the wrong statement pertaining to a shell and tube heat exchanger

Answer 19

Disk and doughnut baffle is the most commonly used baffle

Question 20

Pertains to what type of heat exchanger:

• min value of baffle spacing is 50mm
• max value of baffle spacing is equal to the ID of the shell
• max unsupported tube span is generally about 75 times tube diameter, but is copper and alloys of these

Answer 20

Shell and tube heat exchanger

Question 21

The ratio of the largest load in a test to the original cross-sectional area of the test specimen is called the ______________ stress

Answer 21

ultimate

Question 22

Everytime we cut flux, we produced

Answer 22

Voltage (emf)