6. With reference to the pipe flow, which of the following sentences are correct?A. In laminar flow, the pressure drop for straight pipes does not depend significantlyupon the pipe roughness.B. For a given pipe, the friction factor value increases with an increase of the Reynoldsnumber.C. The height loss value in an expansion depends upon the geometry of the expansion.D. The power required to pump two fluids between two horizontal reservoir dependsupon the length of the pipeline connecting the two reservoirs.7. With reference to the momentum balance, which of the following sentences arecorrect?A. The momentum balance is the balance of forces within the control volume.B. The momentum balance equation is a scalar equation.C. For a pipe with 90º reducing bend, an increase of the pressure at the inlet causes anincrease of the vertical component of the force.D. For the flow through an orifice, the value of the exit velocity from the orificedepends upon the diameter of the orifice. 3. With reference to forces acting on planar and curved surface, which of the followingsentences are correct?A. For planar surfaces, the value of the centre of pressure is the same as the value ofthe centroid.B. For planar surfaces, the value of the centre of pressure depends upon the liquidacting on the surface.C. For curved surfaces, the expression of the vertical component of the force is equal tothe weight of the water column above the curved surface.D. For curved surfaces, the general expression of the horizontal component of the forceis the same as the expression for planar surfaces.4. With reference to the Buoyancy, which of the following sentences are correct?A. The buoyancy force depends upon the total volume of the floating object.B. The buoyancy force depends upon the submerged volume of the floating object.C. In static conditions, for a solid sphere submerged in water, we can write FB = W,where Fg is the buoyancy force and W is the weight.D. The buoyancy force for a submerged object is always null.5. With reference to the "Venturi meter", which of the following sentences are correct?A. The Venturi meter is an instrument to measure the flow rate.B. By fixing all the geometrical values, and for the same value of the imposed pressuredrop, both horizontal and vertical Venturi meters would return the samemeasurement of the flow rate.C. When the Venturi meter is arranged with an angle 0 respect to the horizontal plane,the potential energy difference between inlet and outlet is null.D. In the same Venturi meter, two different values of the imposed pressure drop resultin two different values of the manometer deflection.

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6. With reference to the pipe flow, which of the following sentences are correct? A. In laminar flow, the pressure drop for straight pipes does not depend significantly upon the pipe roughness. B. For a given pipe, the friction factor value increases with an increase of the Reynold number. C. The height loss value in an expansion depends upon the geometry of the expansio D. The power required to pump two fluids between two horizontal reservoir depends upon the length of the pipeline connecting the two reservoirs. 7. With reference to the momentum balance, which of the following sentences are correct? A. The momentum balance is the balance of forces within the control volume. B. The momentum balance equation is a scalar equation. C. For a pipe with 90º reducing bend, an increase of the pressure at the inlet causes a increase of the vertical component of the force. D. For the flow through an orifice, the value of the exit velocity from the orifice depends upon the diameter of the orifice.

6. With reference to the pipe flow, which of the following sentences are correct? A. In laminar flow, the pressure drop for straight pipes does not depend significantly upon the pipe roughness. B. For a given pipe, the friction factor value increases with an increase of the Reynold number. C. The height loss value in an expansion depends upon the geometry of the expansio D. The power required to pump two fluids between two horizontal reservoir depends upon the length of the pipeline connecting the two reservoirs. 7. With reference to the momentum balance, which of the following sentences are correct? A. The momentum balance is the balance of forces within the control volume. B. The momentum balance equation is a scalar equation. C. For a pipe with 90º reducing bend, an increase of the pressure at the inlet causes a increase of the vertical component of the force. D. For the flow through an orifice, the value of the exit velocity from the orifice depends upon the diameter of the orifice.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

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6. With reference to the pipe flow, which of the following sentences are correct?
A. In laminar flow, the pressure drop for straight pipes does not depend significantly
upon the pipe roughness.
B. For a given pipe, the friction factor value increases with an increase of the Reynolds
number.
C. The height loss value in an expansion depends upon the geometry of the expansion.
D. The power required to pump two fluids between two horizontal reservoir depends
upon the length of the pipeline connecting the two reservoirs.
7. With reference to the momentum balance, which of the following sentences are
correct?
A. The momentum balance is the balance of forces within the control volume.
B. The momentum balance equation is a scalar equation.
C. For a pipe with 90º reducing bend, an increase of the pressure at the inlet causes an
increase of the vertical component of the force.
D. For the flow through an orifice, the value of the exit velocity from the orifice
depends upon the diameter of the orifice.

3. With reference to forces acting on planar and curved surface, which of the following
sentences are correct?
A. For planar surfaces, the value of the centre of pressure is the same as the value of
the centroid.
B. For planar surfaces, the value of the centre of pressure depends upon the liquid
acting on the surface.
C. For curved surfaces, the expression of the vertical component of the force is equal to
the weight of the water column above the curved surface.
D. For curved surfaces, the general expression of the horizontal component of the force
is the same as the expression for planar surfaces.
4. With reference to the Buoyancy, which of the following sentences are correct?
A. The buoyancy force depends upon the total volume of the floating object.
B. The buoyancy force depends upon the submerged volume of the floating object.
C. In static conditions, for a solid sphere submerged in water, we can write FB = W,
where Fg is the buoyancy force and W is the weight.
D. The buoyancy force for a submerged object is always null.
5. With reference to the "Venturi meter", which of the following sentences are correct?
A. The Venturi meter is an instrument to measure the flow rate.
B. By fixing all the geometrical values, and for the same value of the imposed pressure
drop, both horizontal and vertical Venturi meters would return the same
measurement of the flow rate.
C. When the Venturi meter is arranged with an angle 0 respect to the horizontal plane,
the potential energy difference between inlet and outlet is null.
D. In the same Venturi meter, two different values of the imposed pressure drop result
in two different values of the manometer deflection.

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