Chemical Fluid Mechanics Basic Questions - Set 34 - ObjectiveBooks

Chemical Fluid Mechanics Basic Questions - Set 34

Practice Test: Question Set - 34

1. Pressure drag does not depend upon the
    (A) Roughness of surface of the body
    (B) Pressure of main flow only
    (C) Length of the body in flow direction
    (D) All (a), (b) and (c)

2. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.
    (A) 1
    (B) 0.1
    (C) 0.01
    (D) 0.001

3. The exit cone angle in case of a standard Venturimeter is __________ the entrance cone angle.
    (A) Smaller than
    (B) Greater than
    (C) Equal to
    (D) Either (a) or (b)

4. In fluid flow, the boundary layer separation cannot occur
    (A) In case of boundaries experiencing form drag
    (B) At points of abrupt changes in the flow directions
    (C) In laminar flow
    (D) None of these

5. Molten soap mass is transported by a __________ pump.
    (A) Diaphragm
    (B) Reciprocating
    (C) Gear
    (D) Centrifugal

6. If more than two branches of pipes are to be connected at the same point, then use a/an
    (A) Elbow
    (B) Union
    (C) Tee
    (D) None of these

7. Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will
    (A) Increase
    (B) Decrease
    (C) Remain same
    (D) Be quadrupled

8. Water hammer is caused, when water flowing in a pipe is suddenly brought to rest by closing the valve. The extent of pressure thus produced due to water hammer depends on the
    (A) Pipe length
    (B) Fluid velocity in the pipe
    (C) Time taken to close the valve
    (D) All (a), (b) and (c)

9. Dimension of surface tension is (where, F = force, L = length)
    (A) FL-1
    (B) F-1L
    (C) F.L-2
    (D) F-2L

10. A mono pump is a __________ pump.
    (A) Centrifugal
    (B) Piston
    (C) Positive acting rotary
    (D) A group of vacuum

11. For pipes that must be broken at intervals for maintenance, the connector used should be a/an
    (A) Union
    (B) Tee
    (C) Reducer
    (D) Elbow

12. Which of the following assumptions enables the Euler's equation of motion to be integrated?
    (A) The fluid is incompressible
    (B) The fluid is non-viscous
    (C) The continuity equation is satisfied
    (D) The flow is rotational and incompressible

13. The terminal velocity of a small sphere settling in a viscous fluid varies as the
    (A) First power of its diameter
    (B) Inverse of the fluid viscosity
    (C) Inverse square of the diameter
    (D) Square of the difference in specific weights of solid & fluid

14. Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.
    (A) Steady uniform
    (B) Non-steady uniform
    (C) Steady non-uniform
    (D) Non-steady non-uniform

15. 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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