Related Questions

Mean residence time is equal to the space time, when
A The feed rate is measured at temperature and pressure in the reactor
B The temperature, pressure and the density of reaction mixture remains constant throughout the reactor
C There is no change in number of moles in gaseous reaction
D All of the above
The use of space time is preferred over the mean residence time in the design of a/an
A Batch reactor
B Ideal tubular-flow reactor
C Slurry reactor
D CSTR
Space time equals the mean residence time
A When the density of the reaction mixture is constant
B For large diameter tubular reactor
C For narrow diameter tubular reactor
D For CSTR
When the density of the reaction mixture is constant in a chemical reaction, the ratio of the mean residence time to space time is
A > 1
B 1
C 0
Which of the following will give maximum gas conversion?
A Fixed bed reactor
B Fluidised bed reactor
C Semi-fluidised bed reactor
D Plug-flow catalytic reactor
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. If the maximum number of valves that can be closed at the same time are closed which of the following must true?
A R is open
B S is open
C T is open
D Z is open
Pick out the wrong conversion formula for the conversion of weight units :
A 1 tonne = 1000 kg = 22.046 lbs
B 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
C 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
D None of these
For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of
A Ideal plug flow
B Bypass
C Dead zone
D Chanelling
The residence time distribution of an ideal CSTR is
A 1/τ exp (-t/τ)
B Τ exp (-t/τ)
C Exp(-t/τ)
D 1/τ (-t/τ)
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.
A 2.5
B 5
C 12.5
D 17.5

Next steps