Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are

A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A → R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: C_A₀= 5 kmole/m³; X_A = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min^-1; (ΔH) = -40 kJ/mole; ρ = 1000 kg/m³ C_P = 4 J/gm.°C; q = 10^-3 m³/min (ρ and C_P are same for the reactant and product streams). The amount of heat to be removed is

A

$$\frac{2}{3}$$ kW

B

1 kW

C

$$\frac{5}{3}$$ kW

D

4 kW

Which of the following is/are the advantages of using a control chart for inspection? (i) A control chart indicates whether the process is in control or out of control. (ii) A control chart determines process variability. (iii) A control chart ensures product quality. (iv) Scrap or percentage reduction can be reduced by taking the necessary actions in time against the warnings indicated by control charts. (v) Control charts build up the reputation of the organization through customer’s satisfaction. (vi) The control chart can detect the unusual variations taking place in a process.

A

i, ii, iii only

B

i, iv, v only

C

i, ii, iii, iv, v and vi

D

iv, v and vi

A liquid phase reaction occurring in a CSTR follows first order dynamics. The feed rate is 500m3/min. Initial concentration of the feed is 50mol/m3. If the reaction conversion is 50% and the reaction is carried out in a 0.5 m3 CSTR, what is the value of rate constant?

A

40

B

20

C

10

D

5

The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be

A

60

B

75

C

90

D

100

An exothermic reaction takes place in an adiabatic reactor. The product temperature __________ reactor feed temperature.

A

Is always equal to

B

Is always greater than

C

Is always less than

D

May be greater or less than

Consider the following statements.
1. The chain reaction process is used in nuclear bombs to release a vast amount of energy, but in nuclear reactors, there is no chain reaction.
2. In a nuclear reactor, the reaction is controlled, while in nuclear bombs, the reaction is uncontrolled.
3. In a nuclear reactor, all operating reactors are 'critical', while there is no question of 'critically' in case of a nuclear bomb.
4. Nuclear reactors do not use moderators, while nuclear bombs use them.
Which of the above statements about operational principles of a nuclear reactor and a nuclear bomb is/are correct?

A

1 and 3

B

2 and 3

C

4 only

D

1 and 4

Which of the following heart valves are mechanical valves? i. Ball Valve ii. Autograft Valve iii. Xenograft Valve iv. Single Leaflet Valve v. Homograft Valve vi. Bi leaflet Valves

A

i, ii, iv, v

B

i, iv, vi

C

ii, iii, v

D

iii, v, vi

The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature of air entering the cooling coil, td₂ = Dry bulb temperature of air leaving the cooling coil and td₃ = Dry bulb temperature of the cooling coil)

A

$$\frac{{{\text{t}}{{\text{d}}_1} - {\text{t}}{{\text{d}}_3}}}{{{\text{t}}{{\text{d}}_2} - {\text{t}}{{\text{d}}_3}}}$$

B

$$\frac{{{\text{t}}{{\text{d}}_2} - {\text{t}}{{\text{d}}_3}}}{{{\text{t}}{{\text{d}}_1} - {\text{t}}{{\text{d}}_3}}}$$

C

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_1}}}{{{\text{t}}{{\text{d}}_2} - {\text{t}}{{\text{d}}_3}}}$$

D

$$\frac{{{\text{t}}{{\text{d}}_3} - {\text{t}}{{\text{d}}_2}}}{{{\text{t}}{{\text{d}}_1} - {\text{t}}{{\text{d}}_3}}}$$

For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1 min^-1. What will be the conversion for a PFR with a space velocity of 0.2 min^-1?
(Assume that all the other operating conditions are the same for CSTR and PFR.)

A

0.15

B

0.30

C

0.60

D

0.90

Consider the following statements: 1. Integral controller improves steady state response 2. By use of proportional controller, maximum peak overshoot decreases 3. Type and order of system reduces by one for derivative controller 4. Integral controller makes the system less stable in transient state due to oscillations Select the correct answer using the codes given below:

A

1,3 and 4

B

1,2 and 3

C

2.3 and 4

D

1,2 and 4

Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are

Related Questions