Chemical Engineering Basic


Internal energy of a gas obeying Vanderwall's equation of state,`(p + a/v^2)(v - b) = RT` , depends upon its

A. pressure & temperature.
B. pressure & specific volume.
C. temperature & specific volume.
D. temperature only.


Pick out the wrong statement.

A. The equivalent stiffness of two springs (of equal stiffness 'S') in series is S/2 while in parallel is 2S
B. For a helical spring, deflection is proportional to `D^3 `(D = mean coil diameter) or `d^4 `(d = wire diameter)
C. Crushing load or columns is less than the buckling load.
D. Modulus of resilience is proportional to ( stress at elastic` limit)^2 `.


If the head is doubled in & centrifugal pump, the power required will increase in the ratio of

A. `2^3`
B. `2^(3//2)`
C. `2^(5//2)`
D. `2^(1//3)`


Glass reacts with

A. `H_2SO_3`
C. `HNO_3`
D. `K_2Cr_2O_7`


Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

A. `Re^0.5, Re^0.8`
B. `Re^0.8, Re^ - 0.5`
C. `Re^0.8, Re^0.5`
D. `Re^- 0.8, Re^0.5`