Chemical Engineering Mcqs

Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the _______________ decreases?

• (A)  NPSH required
• (B)  BHP required by the pump
• (C)  Head of the liquid pumped
• (D)  All

Answer

Submitted By :Ali Uppal

When the pipe Reynold’s number is 6000, the flow is generally___________________?

• (A)  Viscous
• (B)  Laminar
• (C)  Turbulent
• (D)  Transition

Answer

Submitted By :Ali Uppal

Which of the following is a dimensionless parameter ?

• (A)  Angular velocity
• (B)  Specific weight
• (C)  Kinematic viscosity
• (D)  None of these

Answer

Submitted By :Ali Uppal

The pump impeller and the turbine runner in a hydraulic torque converter___________________?

• (A)  Have the same diameter
• (B)  Have different diameters
• (C)  Are directly coupled
• (D)  None of these

Answer

Submitted By :Ali Uppal

Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________?

• (A)  Occurs when NRe is very small
• (B)  Is primarily a friction drag
• (C)  Is independent of body length
• (D)  Depends mainly on cross-sectional shape

Answer

Submitted By :Ali Uppal

A streamline is_________________?

• (A)  The line connecting the mid-points of flow cross-sections
• (B)  Defined for uniform flow only
• (C)  Drawn normal to the velocity vector at every point
• (D)  Always the path of a particle

Answer

Submitted By :Ali Uppal

What causes convective acceleration in fluid flow ?

• (A)  Steep slope in flow
• (B)  Unsteady nature of flow
• (C)  Non-uniformity of flow
• (D)  Turbulence in flow

Answer

Submitted By :Ali Uppal

Each term of the Bernoulli’s equation written in the form, (p/ρ) + (g/gc). Z + (v2/2gc) = constant, represents the total energy per unit ________________?

• (A)  Mass
• (B)  Volume
• (C)  Specific weight
• (D)  None of these

Answer

Submitted By :Ali Uppal

The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonian fluid in a circular pipe is_____________________?

• (A)  0.5
• (B)  1
• (C)  2
• (D)  0.66

Answer

Submitted By :Ali Uppal

The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by (where, x = each side of the square duct) ?

• (A)  x
• (B)  √(πx)
• (C)  √(2x)
• (D)  √(x/2)

Answer

Submitted By :Ali Uppal