How the gas behave across the fluidized bed, when the velocity is more than minimum fluidization?

How the liquid behave across the fluidized bed, when the velocity is more than minimum fluidization?

A

Bubbles formation

B

Slugs formation

C

No bubbles

D

None of the mentioned

Parameters that describe the overall behaviour of the fluidized bed in the bubbling regime are: (i) minimum fluidization velocity, (ii) Pressure drop across the bed, (iii) Bed height increase, (iv) Particle elutriation.

A

(i) (ii)

B

(ii) (iii) (iv)

C

(i) (ii) (iii) (iv)

D

(i) (ii) (iii)

When the bed is fluidized with liquids, it is known as _ fluidization, and with gas too it is known as _ fluidization.

A

Homogeneous, Homogeneous

B

Heterogeneous, Homogeneous

C

Homogeneous, Heterogeneous

D

Heterogeneous, Heterogeneous

Before the pressure drop stabilizes after the bed gets fluidized, what is the position of pressure drop before reaching minimum fluidization?

A

Above the constant

B

Below the constant

C

Equal

D

Hard to tell

The velocity of fluid is operated between minimum fluidizing velocity(Umf) and Pneumatic velocity in fluidized bed, true or false?

A

True

B

False

What is the maximum range of superficial gas velocity when the TDH of the bed is 0.25m to prevent eluitrition in a circular type fluidized bed reactor?

A

0.1-5 m/sec

B

1.5-12 m/sec

C

12-24 m/sec

D

5-5.5 m/sec

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

Which of the following statements are true/false?
1. In case an employee whose minimum rate of wages is fixed under this Act, works overtime, the employer need not pay the money for the extra hours devoted by the employee.
2. If an employee whose minimum rate of wages has been fixed under this Act, works for a less number of hours than the requisite number of hours on a given day, he shall be entitled to receive wages in respect ofwork done by him on that day as ifhe had worked for a full normal working day.
3. In case an employee is involved in two or more classes of work, he shall be paid on the basis of pieces involved.
4. If an employee is employed on piece work for which minimum time rate and not a minimum piece rate has been fixed under this Act, the employer shall pay to such employee wages at not less than the minimum time rate.

A

1, 4 are true and 2, 3 are false

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

U_mf is the minimum fluidisation velocity for a bed of particles. An increase in the superficial gas velocity from 2 U_mf to 2.5 U_mf results in (all velocities are smaller than the entrainment velocity of the particles) no change in the

A

Drag on particles

B

Drag on coloumn walls

C

Bed height

D

Bed voidage

In which system high pressure is used, Fluidized Catalytic Cracking(FCC) or Fluidized Catalytic Reforming(FCR) or Fluidized Combustion Chamber(FCCh)?

A

FCC

B

FCR

C

FCCh

D

All of the mentioned