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- Question
The maximum permissible limit (BIS) of turbidity in drinking water is
Options- A. 5 NTU
- B. 10 NTU
- C. 15 NTU
- D. 20 NTU
- Correct Answer
- 10 NTU
- 1. In a fluidized bed reactor, the function of the disengagement zone is to
Options- A. reduce loss of particles from the reactor
- B. reduce the velocity of the particles near the surface of the reactor
- C. reduce foaming problems
- D. all of the above Discuss
- 2. The effectiveness factor increases with the
Options- A. increase of diffusivity and decreased with the increase of particle size
- B. increase of diffusivity and increased with the increase of particle size
- C. decrease of diffusivity and decreased with the increase of particle size
- D. increase of diffusivity and decrease with the decrease of particle size Discuss
- 3. The average fractional gas hold up (H) can be given as (where Zf and Zl are the level of aerated and clear liquid respectively)
Options- A. H = (Zf-Zl)/Zf
- B. H = Zf/Zl
- C. H = Zf/ZfZl
- D. H =(Zf+Zl)/Zf Discuss
- 4. For laminar flow, Reynolds number is correlated with power number as (where K, a constant which depends on the container geometry and shape of stirrer; Rei is Reynolds number for agitator; Di, stirrer diameter and N, stirrer speed)
Options- A. Np = K(Rei)-1
- B. Np = N2Di(Rei)-1
- C. Np = K(Rei)
- D. Np = KNDi(Rei)-2 Discuss
- 5. The main function of the dimples provided in the cooling jacket is to
Options- A. increase the level of turbulence of the cooling water in the jacket
- B. increase the residence time of the cooling water in the jacket
- C. increase the cooling water-jacket wall boundary layer size
- D. all of the above Discuss
- 6. In a tall reactor, oxygen transfer rates will be
Options- A. highest at the surface of the reactor
- B. highest at the base of the reactor
- C. highest in the middle of the reactor
- D. the same throughout the reactor Discuss
- 7. Milk digestibility is improved by using
Options- A. RNase
- B. lactase
- C. ?-amylase
- D. none of these Discuss
- 8. The power required by an agitator operating in a gas-sparged system is
Options- A. lesser than the power required by an impeller in operating at same speed in a gas free system
- B. more than the power required by an impeller in operating at same speed in a gas free system
- C. same as the power required by an impeller in operating at same speed in a gas free system
- D. none of the above Discuss
- 9. The monod model predicts that the specific growth rate
Options- A. will increase with the concentration of the growth limiting substrate until it reaches a maximum value
- B. will decrease with the concentration of the growth limiting substrate
- C. will increase with the concentration of the growth limiting substrate
- D. does not depend on growth limiting substrate Discuss
- 10. The ratio of the amount of a protein present in a sample, which is used as a measure of purification, is known as
Options- A. specific activity
- B. relative activity
- C. purity ratio
- D. all of these Discuss
More questions
Correct Answer: all of the above
Correct Answer: increase of diffusivity and decreased with the increase of particle size
Correct Answer: H = (Zf-Zl)/Zf
Correct Answer: Np = K(Rei)-1
Correct Answer: increase the level of turbulence of the cooling water in the jacket
Correct Answer: highest at the base of the reactor
Correct Answer: lactase
Correct Answer: lesser than the power required by an impeller in operating at same speed in a gas free system
Correct Answer: will increase with the concentration of the growth limiting substrate until it reaches a maximum value
Correct Answer: specific activity
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