The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

Pearl Towers is taller than Sky Towers but shorter than Unity Towers. Unity Towers and Cyber Towers are of same height. Pearl Towers is shorter thanIndus Towers. Amongst the buildings, who is the second shortest?

A

Pearl Tower

B

Sky Tower

C

Indus Tower

D

Unity Tower

Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

A

Packing may be crushed due to thermal expansion/contraction of the components of the equipments

B

Pressure drop in the equipment will be very high

C

Viscosity variation of the fluids may cause channeling/flooding

D

None of these

In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

A

Molal flow rate of vapour

B

Vapour molecular weight

C

Pressure and temperature

D

All of the above

Consider a regular hexagon ABCDEF. Two towers are situated at B and C. The angle of elevation from A to the top of the tower at B is 30 deg, and the angle of elevation to the top of the tower at C is 45 deg. What is the ratio of the height of towers at B and C?

A

1:\u221a3

B

1:3

C

1:2

D

1:2\u221a3

A person, standing exactly midway between two towers, observes the top of the two towers at angle of elevation of 22.5° and 67.5°. What is the ratio of the height of the taller tower to the height of the shorter tower? (Given that tan 22.5° = $$\sqrt 2 - 1$$ )

A

$$1 - 2\sqrt 2 :1$$

B

$$1 + 2\sqrt 2 :1$$

C

$$3 + 2\sqrt 2 :1$$

D

$$3 - 2\sqrt 2 :1$$

The height of a tower is 300 meters. When its top is seen from top of another tower,then the angle of depression is 60°. The horizontal distance between thebases of the two towers is 120 metres. What is the height (in metres) of the small tower?

A

88.24

B

106.71

C

92.15

D

112.64

A packed tower compared to a plate tower for a particular mass transfer operation

A

Incurs smaller pressure drop

B

Allows installation of cooling coils

C

Is less costly when built in large sizes/diameters

D

Is more suitable, if suspended solids are present in fluid streams

From a point P, the angle of elevation of a tower is such that its tangent is 3/4. On walking 560 metres towards the tower the tangent of the angle ofelevation of the tower becomes 4/3. What is the height (in metres) of the tower?

A

720

B

960

C

840

D

1030

The angle of elevation of the top of a tower from a certain point is 30°. If the observed moves 20 m towards the tower, the angle of elevation the angle of elevation of top of the tower increases by 15°. The height of the tower is

A

17.3 m

B

21.9 m

C

27.3 m

D

30 m

The angle of elevation of the top of a tower from a certain point is 30°. If the observer moves 40 m towards the tower, the angle of elevation of the top of the tower increases by 15°. The height of the tower is:

A

64.2 m

B

62.2 m

C

52.2 m

D

54.6 m

The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

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