CBT Test Chemical Engineering Fluid Mechanics - Set 38 - ObjectiveBooks

# Practice Test: Question Set - 38

1. Which of the following factors does not contribute to the pressure drop in a pipeline?
(A) Velocity of fluid
(B) Size of pipe
(C) Length of pipe and number of bends
(D) None of these

2. Two dimensional stream function
(A) Relates velocity and pressure
(B) Is constant along a stream line
(C) Is constant along an equipotential surface
(D) None of these

3. What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air.
(A) 4Ï€g/3
(B) 0.01 Ï€gH/4
(C) 0.01 Ï€gH/8
(D) 0.04 Ï€gH/3

4. Small pressure differences in liquids is measured using a/an
(A) U-tube manometer
(B) Inclined tube manometer
(C) Pitot tube
(D) None of these

5. Cd for the orifice plate varies from
(A) 0.58 to 0.8
(B) 0.93 to 0.98
(C) 0.2 to 0.3
(D) 0.02 to 0.03

6. Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively).
(A) FL-2T, ML-1T-1
(B) FLT, ML-1T-1
(C) ML-1T-3, F-1L2T
(D) F-1L2T-1, MLT-3

7. Reynolds number is the ratio of
(A) Viscous forces to gravity forces
(B) Inertial forces to viscous forces
(C) Viscous forces to inertial forces
(D) Inertial forces to gravity forces

8. Which of the following two quantities when same, makes one pipe system equivalent to another pipe system?
(B) Length & discharge
(C) Length & diameter
(D) Friction factor & diameter

9. Friction produced by the formation of wakes is called the __________ friction.
(A) Disk
(B) Skin
(C) Form
(D) None of these

10. Slugging in a fluidized bed can be avoided by using
(A) Tall narrow vessel
(B) Deep bed of solids
(C) Shallow beds of solids and proper choice of particle size
(D) Very large particles

11. The discharge through a Venturimeter depends upon
(A) Pressure drop only
(B) Its orientation
(C) Co-efficient of contraction only
(D) None of these

12. Fluid flow in a/an __________ is an example of pressure flow.
(A) Partially filled pipeline
(B) Pipe
(C) Open channel
(D) River

13. The head loss due to sudden expansion is
(A) (V12 - V22)/2gc
(B) (V1 - V2)2/2gc
(C) (V1 - V2)/2gc
(D) (V12 - V22)/gc

14. Boundary layer separation is characterized by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions.
(A) Re << 1, accelerating flow
(B) Re >> 1, accelerating flow
(C) Re << 1, decelerating flow
(D) Re >>1, decelerating flow

15. The ratio of the wall drag to the form drag in the Stoke's law range (for motion of spherical particles in a stationary fluid) is
(A) 0.5
(B) 1
(C) 2
(D) 0.33

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