Fluid Mechanics for Chemical MCQs

724 MCQs  — Chemical Engineering MCQs  (Page 24 of 73)

Attempt Fluid Mechanics for Chemical Quiz
What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe) ?
A. 0.5
B. 1
C. 1.5
D. 2
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Erosion and pits formation on the impeller of a centrifugal pump may be due to________________?
A. Cavitation
B. Low speed of impeller
C. Its operation with delivery valve closed for considerable time after starting the pump
D. Off centering of pump with motor
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Cavitation occurs in a centrifugal pump when the suction pressure is________________?
A. Less than the vapour pressure of the liquid at that temperature
B. Greater than the vapour pressure of the liquid at that temperature
C. Equal to the vapour pressure
D. Equal to the developed head
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Propellers are____________________?
A. Axial flow mixers
B. Low speed impeller
C. Used for mixing liquids of high viscosity
D. Radial flow mixers
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The range of a particular Rotameter can be increased by__________________?
A. Use of floats of different densities
B. No means
C. Increasing the diameter of the float
D. Decreasing the diameter of the float
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The value of critical Reynolds number for pipe flow is_________________?
A. 1,300
B. 10,000
C. 100,000
D. None of these
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The contraction co-efficient for Borda’s mouthpiece (for frictionless fluid) is__________________?
A. 0.1
B. 0.5
C. 0.94
D. 1
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In a stabilised soap bubble, pressure inside it compared to external pressure is________________?
A. More
B. Less
C. Same
D. Unpredictable
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Volute of a centrifugal pump should be designed in a fashion, such that the________________?
A. Kinetic head gets converted into static head
B. Moving stream gradually reduces velocity
C. Mean velocity remains constant
D. None of these
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For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively) ?
A. G is above b
B. B is above g
C. B & g coincide
D. None of these
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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