Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm c) is proportional to __________ and the cycle time (where, $$\mu $$ = filtrate viscosity, Rm = filter medium resistance, Rc = cake resistance ).

Filtrate flow rate in case of a rotary drum vacuum filter (in which Rm c) is proportional to __________ and the cycle time (where, μ = filtrate viscosity Rm = filter medium resistance Rc = cake resistance ).

A

√μ

B

1/√μ

C

1/μ

D

1/μ²

A rotary drum filter with 30% submergence is used to filter concentrated aqueous slurry of calcium carbonate containing 15lb of solids per cubic foot of water. The pressure–drop is 2011Hg. If the filter cake contains 50% mixture (wet basis), calculate the filter area required to filter 10 gal/min of slurry. The filter cycle time is 5 min. The specific cake resistance depends on the pressure–drop as: α (ft/lb) = α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance.

A

≅ 88 ft2

B

= α (Δp)0.26, where α = 2.90×1010 Viscosity of the filtrate = 6.72×10-4 lb/ft-s. Density of calcium carbonate = 168.8 lb/ft3. Neglect filter medium resistance. a) ≅ 88 ft2 [ ≅ 86 ft2

C

≅ 82 ft2

D

≅ 90 ft2

Five cakes in a shop are placed in a row on a shelf. Cake T is to the immediate left of Cake R and to the immediate right of Cake U. Cake M is to the right of Cake R. Cake B is the neighbour of Cake R and Cake M. Which cake is placed in the middle of the shelf?

A

Cake T

B

Cake R

C

Cake M

D

Cake B

Drum X is 1/2 full of oil and drum Y, which has twice the capacity of drum X, is 2/3 full of oil. If all of the oil in drum X is poured into drum Y, then drum Y will be filled to what fraction of its capacity?

A

3/4

B

5/6

C

11/12

D

7/6

Filtration rate through a filter cake is proportional to (where, S = filtering surface, R = specific cake resistance, $$\mu $$ = viscosity of the filtrate)

A

S

B

$$\frac{1}{{\text{R}}}$$

C

$$\frac{1}{\mu }$$

D

All of the above

Statement 1: Filter cake increases the efficiency of filtration. Statement 2: Filter aid is added to the filter cake when the filter cake is the desired product.

A

True, False

B

True, True

C

False, False

D

False, True

Which of the following statements are true/false?
1. A minimum rate of wages for the time spent by employees for the production of output is minimum time rate.
2. Minimum piece rate is the rate based on the quantity of the output employees have produced.
3. The guaranteed time rate is a minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis.
4. A minimum rate of remuneration to apply in the case of employees employed on piece work for the purpose of securing to such employees a minimum rate of wages on a time work basis is overtime rate.

A

1, 2, 3 and 4 are true

B

1, 3 are true and 2, 4 are false

C

2, 4 are true and 1, 3 are false

D

3, 4 are true and 2, 1 are false

Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.

A

Filtering

B

Washing

C

Drying

D

All of the above

A foil is to be put as shield over a cake (circular) in a shape such that the heat is even along any diameter of the cake. Given that the heat on cake is proportional to the height of foil over cake, the shape of the foil is given by

A

f(x, y) = sin(y/x)x2 + xy

B

f(x, y) = x2 + y3

C

f(x, y) = x2y2 + x3y3

D

not possible by any analytical function

Statement 1: Continuous Rotary vacuum filter press has a high labor cost. Statement 2: Continuous Rotary vacuum filter press has a high clogging.

A

True, False

B

True, True

C

False, False

D

False, True

Filtrate flow rate in case of a rotary drum vacuum filter (in which R_m c) is proportional to __________ and the cycle time (where, $$\mu $$ = filtrate viscosity, R_m = filter medium resistance, R_c = cake resistance ).

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