A.Both A. and B.
B.When the data are scattered
C.For testing specific mechanisms with simple rate expressions
D.None of these
Explanation: The correct answer is Both A. and B..
Submitted by: Academy of Pakistan
Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 113 of 557.
Chemical Engineering MCQs
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A.Grey
B.Black
C.White
D.Yellow
Explanation: The correct answer is Black.
Submitted by: Academy of Pakistan
A.All ‘a’, ‘b’, & ‘c’
B.Comprises of thin bed of substances of extended surface having high porosity
C.Helps in increasing the bubble size entering the settler
D.Helps in increasing the settling rate of the bubbles
Explanation: The correct answer is All ‘a’, ‘b’, & ‘c’.
Submitted by: Academy of Pakistan
A.(NH4)2HPO4
B.(CH3 C6 H4)3 PO4
C.NH4H2PO4
D.Ca10(PO4)3F6
Explanation: The correct answer is (CH3 C6 H4)3 PO4.
Submitted by: Academy of Pakistan
A.5 to 10
B.1 to 5
C.0.1 to 0.5
D.15 to 25
Explanation: The correct answer is 0.1 to 0.5.
Submitted by: Academy of Pakistan
A.83 & 100
B.87 & 94
C.94 & 100
D.94 & 87
Explanation: The correct answer is 87 & 94.
Submitted by: Academy of Pakistan
A.Nusselt
B.Biot
C.Prandtl
D.Reynolds
Explanation: The correct answer is Reynolds.
Submitted by: Academy of Pakistan
A.Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%
B.75% oleum can be produced by distillation of 20% oleum
C.Contact process of sulphuric acid manufacture uses nickel as the catalyst
D.Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98%
Explanation: The correct answer is Contact process of sulphuric acid manufacture uses nickel as the catalyst.
Submitted by: Academy of Pakistan
A.Humidity
B.Dry bulb temperature
C.Wet bulb temperature
D.Relative saturation
Explanation: The correct answer is Wet bulb temperature.
Submitted by: Academy of Pakistan
A.Total
B.Maximum permissible
C.Minimum
D.Operating
Explanation: The correct answer is Total.
Submitted by: Academy of Pakistan
A.3
B.0
C.1
D.2
Explanation: The correct answer is 2.
Submitted by: Academy of Pakistan
A.Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds
B.An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns
C.For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design
D.Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns
Explanation: The correct answer is Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds.
Submitted by: Academy of Pakistan
A.Exhaust
B.Deaeration
C.Condensation
D.Scavenging
Explanation: The correct answer is Deaeration.
Submitted by: Academy of Pakistan
A.High silicon iron, Kel-F and Teflon
B.Silicone rubber
C.Tin and wood
D.Stainless steel
Explanation: The correct answer is High silicon iron, Kel-F and Teflon.
Submitted by: Academy of Pakistan
A.Bleaching powder
B.Alum
C.Calcium sulphate
D.Chlorine
Explanation: The correct answer is Alum.
Submitted by: Academy of Pakistan