Chemical Engineering Basic

1: 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.

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2

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 `.

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3: 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)`

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A. `H_2SO_3`

B. HF

C. `HNO_3`

D. `K_2Cr_2O_7`

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5: 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`

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