Exercise: Agitation And Aeration

Questions for: Agitation And Aeration

Which device is commonly used for measuring the rate of rotation (rpm) of the stirrer shaft?
A:
Anemometer
B:
Manometer
C:
Tachometer
D:
Barometer
Answer: C
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Which of the following will have the largest interfacial area per unit volume?
A:
A bubble with a diameter of 1 mm
B:
A bubble with a diameter of 5 mm
C:
A bubble with a diameter of 15 mm
D:
A bubble with a diameter of 50 mm
Answer: A
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The power required by an agitator operating in a gas-sparged system is
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
Answer: A
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The main function of the dimples provided in the cooling jacket is to
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
Answer: A
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A higher liquid height will lead to a higher gas hold up by which the oxygen transfer rate will be
A:
higher throughout the reactor
B:
lower throughout the reactor
C:
higher at the base of the reactor
D:
lower at the base of the reactor
Answer: C
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