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MCQs

Total Questions : 234 | Page 23 of 24 pages
Question 221. . Which of the following impellers generate a flow parallel to the axis of shaft?
  1.    Axial flow
  2.    Radial flow
  3.    Both (a)and(b)
  4.    None of these
 Discuss Question
Answer: Option A. -> Axial flow
Question 222. .  In a tall reactor, oxygen transfer rates will be
  1.    highest at the surface of the reactor
  2.    highest at the base of the reactor
  3.    highest in the middle of the reactor
  4.    the same throughout the reactor
 Discuss Question
Answer: Option B. -> highest at the base of the reactor
Question 223. . Which of the following impeller is used in situation where strong vertical currents are desirable for suspending heavily particles?
  1.    Propeller
  2.    Paddle
  3.    Turbine
  4.    None of these
 Discuss Question
Answer: Option A. -> Propeller
Question 224. . Laminar flow range of mixing speed is obtained for
  1.    Rei
  2.    10
  3.    Rei>104
  4.    None of these
 Discuss Question
Answer: Option A. -> Rei
Question 225. . Which of the following number is calculated from the diameter and peripheral speed of the impeller?
  1.    Reynolds number
  2.    Froude number
  3.    Power number
  4.    None of these
 Discuss Question
Answer: Option A. -> Reynolds number
Question 226. . A higher liquid height will lead to a higher gas hold up by which the oxygen transfer rate will be
  1.    higher throughout the reactor
  2.    lower throughout the reactor
  3.    higher at the base of the reactor
  4.    lower at the base of the reactor
 Discuss Question
Answer: Option C. -> higher at the base of the reactor
Question 227. . The main function of the dimples provided in the cooling jacket is to
  1.    increase the level of turbulence of the cooling water in the jacket
  2.    increase the residence time of the cooling water in the jacket
  3.    increase the cooling water-jacket wall boundary layer size
  4.    all of the above
 Discuss Question
Answer: Option A. -> increase the level of turbulence of the cooling water in the jacket
Question 228. 0. The power required by an agitator operating in a gas-sparged system is
  1.    lesser than the power required by an impeller in operating at same speed in a gas free system
  2.    more than the power required by an impeller in operating at same speed in a gas free system
  3.    same as the power required by an impeller in operating at same speed in a gas free system
  4.    none of the above
 Discuss Question
Answer: Option A. -> lesser than the power required by an impeller in operating at same speed in a gas free system
Question 229. 1. Which of the following will have the largest interfacial area per unit volume?
  1.    A bubble with a diameter of 1 mm
  2.    A bubble with a diameter of 5 mm
  3.    A bubble with a diameter of 15 mm
  4.    A bubble with a diameter of 50 mm
 Discuss Question
Answer: Option A. -> A bubble with a diameter of 1 mm
Question 230. 2. Which device is commonly used for measuring the rate of rotation (rpm) of the stirrer shaft?
  1.    Anemometer
  2.    Manometer
  3.    Tachometer
  4.    Barometer
 Discuss Question
Answer: Option C. -> Tachometer

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