Fluid Mechanics for Chemical MCQs

724 MCQs — Chemical Engineering MCQs (Page 49 of 73)

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A Rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and Rotameter shows the same reading, the flow rate (cc/sec) is__________________?

A. 26
B. 42
C. 269
D. 325

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Co-efficient of velocity is ___________________ the coefficient of discharge?

A. Less than
B. More than
C. Equal to
D. Not related to

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The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________?

A. Dq/dx = k
B. Dq/dx = k.q
C. Dq/dx = k/q
D. Dq/dx = kq2

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The terminal velocity of a particle moving through a fluid varies as dp n. What is the value of n’ for Newton’s law regime ?

A. 0.5
B. 1
C. 1.5
D. 3

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Fluidised beds are formed, when the__________________?

A. Fluid friction is zero
B. Gravity force is less than the fluid friction
C. Pressure forces equal gravity forces
D. Sum of the fluid friction and pressure forces is equal and opposite to gravity forces

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Which of the following is not concerned with the fluid-particle interaction ?

A. Drag co-efficient
B. Froude number
C. Galileo number
D. Weber number

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The ____________ is measured by a piezometric opening?

A. Dynamic pressure
B. Static pressure
C. Total pressure
D. Point velocity

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What is the normal range of exit cone angle of a Venturimeter ?

A. 2 to 5
B. 7 to 15
C. 15 to 25
D. >25

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For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by_______________?

A. ∂u/∂x = 0
B. ∂(ρu)/∂x = 0
C. (∂u/∂x) = – (∂ρ/∂t)
D. ∂ρ/∂t = 0

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Absolute viscosity of a fluid is a function of the __________ of the fluid?

A. Motion
B. Pressure & temperature
C. Shearing stress
D. Both b. & c.

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