Practice Test: Question Set - 02
1. Lower BWG means __________ of the tube.
- (A) Lower
thickness
- (B) Lower
cross-section
- (C) Outer
diameter
- (D) Inner
diameter
2. Pick out the wrong statement.
- (A) A
fluid mass is free from shearing forces, when it is made to rotate with a
uniform velocity
- (B) Newton's
law of viscosity is not applicable to the turbulent flow of fluid with linear
velocity distribution
- (C) Laminar
flow of viscous liquids is involved in the lubrication of various types of
bearings
- (D) Rise
of water in capillary tubes reduces with the increasing diameter of capillary
tubes
3. Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as
- (A) V1.8
- (B) V-0.2
- (C) V2.7
- (D) V2
4. Which of the following is a Newtonian fluid?
- (A) Rubber
latex
- (B) Sewage
sludge
- (C) Quicksand
- (D) Non-colloidal
solution
5. During fluid flow, variation of shear stress (τ) with velocity gradient a (dv/dy) constant pressure temperature is shown below in the figure. In the figure, Bingham plastic is represented by the curve:
- (A) V
- (B) II
- (C) III
- (D) I
6. Centrifugal pumps as compared to reciprocating pumps
- (A) Run at a lower speed
for the same discharge
- (B) Do not need priming
- (C) Deliver fluid with
pulsating/fluctuating discharge
- (D) Can be run with
discharge line valve closed for a short interval
7. In magnetic flow meters, voltage generation is
- (A) Due to the motion of
conducting fluid through an externally generated uniform field
- (B) Proportional to the
fluid velocity
- (C) Both (a) and (b)
- (D) Neither (a) nor (b)
8. Transition length for a turbulent fluid entering into a pipe is around __________ times the pipe diameter.
- (A) 5
- (B) 50
- (C) 500
- (D) 5000
9. The pressure co-efficient is the ratio of pressure forces to __________ forces.
- (A) Viscous
- (B) Inertial
- (C) Gravity
- (D) Surface
tension
10. The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number.
- (A) Increases
- (B) Decreases
- (C) Remain same
- (D) May
increase or decrease
11. Prandtl mixing length is
- (A) Applicable
to laminar flow problems
- (B) A
universal constant
- (C) Zero
at the pipe wall
- (D) None
of these
12. Drag co-efficient for flow past immersed body is the ratio of __________ to the product of velocity head and density.
- (A) Shear stress
- (B) Shear force
- (C) Average drag per unit
projected area
- (D) None of these
13. Viscosity of water at 40°C lies in the range of
- (A) 1 × 10-3 to
2 × 10-3 kg/m.s
- (B) 0.5 × 10-3 to
1 × 10-3 kg/m.s
- (C) 1 to 2 kg/m.s
- (D) 0.5 to 1 kg/m.s
14. In continuous fluidization
- (A) Solids are completely
entrained
- (B) The pressure drop is
less than that for batch fluidization
- (C) There is no
entrainment of solids
- (D) Velocity of the fluid
is very small
15. Potential flow is characterized by the
- (A) Irrotational and
frictionless flow
- (B) Irrotational and
frictional flow
- (C) One in which
dissipation of mechanical energy into heat occurs
- (D) Formation of eddies
within the stream
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