Process Equipment and Plant Design MCQs

Question 1

$$\frac{{{{	ext{L}}_{	ext{e}}}}}{{	ext{D}}}$$ for a Tee (used as elbow, entering branch) would be

Accepted Answer

Both B and C

Answer

Less than that for Tee (used as elbow, entering run)

Answer

More than that for Tee (used as elbow, entering run)

Answer

Around 90

Question 2

Generally, elliptical dished heads

Accepted Answer

All of the above

Answer

Are manufactured on 2 : 1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m 2

Answer

Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter

Answer

Are approximately as strong as seamless cylindrical shell having the corresponding I.D. and O.D.

Question 3

For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between __________ times the tank diameter.

Accepted Answer

1 to 1.5

Answer

2.5 to 3.5

Answer

4 to 5

Answer

6 to 8

Question 4

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

Accepted Answer

Poisson's ratio

Answer

Bulk modulus

Answer

Modulus of elasticity

Answer

Shear modulus

Question 5

LMTD correction factor is used in heat exchanger design for

Accepted Answer

Multipass shell and tube heat exchanger

Answer

Double pipe heat exchanger

Answer

Fouling fluids

Answer

Counter flow of hot and cold fluids

Question 6

In case of a shell and tube heat exchanger, the minimum shell thickness for carbon steel (inclusive of corrosion allowance) depends on shell diameter and is in the range of __________ mm.

Accepted Answer

5-11

Answer

3-5

Answer

8-15

Answer

12-18

Question 7

To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

Accepted Answer

$${\left( {1.2} \right)^{\frac{5}{3}}}$$

Answer

$${\left( {1.2} \right)^{\frac{3}{2}}}$$

Answer

$${\left( {1.2} \right)^{\frac{3}{5}}}$$

Answer

$${\left( {1.2} \right)^{\frac{2}{3}}}$$

Question 8

In a shell and tube heat exchanger, the 'tube pitch' is defined as the

Accepted Answer

Shortest centre to centre distance between adjacent tubes

Answer

O.D. of the tube for square pitch

Answer

Shortest distance between two adj acent tube holes

Answer

None of these

Question 9

A cylinderical pressure vessel of volume 6 πm 3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125 N/mm 2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

Accepted Answer

10 mm

Answer

5 mm

Answer

6 mm

Answer

8 mm