A thin circulr disc has a concentric hole in it. On heating the diameter of hole will
A.increase
B.decrease
C.remain constant
Category: Chemical Engineering Mcqs
Which one of the following thermocouples develops least e.m.f. for the same difference of temperature between hot and cold junctions?
A.Iron-constantan
B.Copper-constantan
C.Chromel-alumel
D.Platinum-platium + 13% rhodium
At low pressure the molal heat capacity of an ideal monoatomic gas at constant-volume is equal to
A.3 J / (kmol.K)
B.3 kcal / (kmol.K)
C.0.24 kcal/(kmol.K)
D.1 kcal/(kmol.K)
The characterization factor (K) for Ankleshwar crude oil is about
A.1.2
B.120
C.12
D.21
The principal raw materials for the manufacture of soda ash by Solvay process are
A.limestone and potassium chloride
B.dolomite and sodium hydroxide
C.limestone brine and coal
D.coal and caustic soda
In case of natural covection, the Nusselt number is function of
A.Reynolds number
B.Reynolds number and Prandtl number
C.Grashof’s number and Prandtl number
D.Weber number and Mach number
E.None of the above
The primary purpose of visbreaking process is
A.To increase viscosity and pour point
B.in reduce viscosity and pour point
C.to increase viscosity and reduce pour point
D.to reduce viscosity and increase pour point
The buoyant force on a floating/submerged body is
A.a force due to gravity and acts downward
B.equal to the weight of liquid displaced by the body and acts vertically upward
C.the resultant force on a body due to the fluid surrounding it
D.the force necessary to maintain equilibrium of a submerged body
The chemical most commonly used to speed sedimentation of sewage is
A.sulphuric acid
B.copper sulphate
C.lime
D.sodium ermanganate
Two bodies one hot and the other cold are kept in vacuum. What will happen to the temperature of the hot body after sometime?
A.Remains the same
B.Decreases due to convection
C.Increases due to convection
D.Increases due to radiation
E.Decreases due to radiation
