301.In isotropic turbulence, the _________ are equal to each other.
Temporal velocity components
Mean square of velocity fluctuations in the three co-ordinate directions
Root mean square of velocity fluctuations in the three co-ordinate directions
None of these
Correct answer: (B) Mean square of velocity fluctuations in the three co-ordinate directions
302.In laminar flow through a round tube, the discharge varies
Linearly as the viscosity
Inversely as the pressure drop
Inversely as the viscosity
As the square of the radius
Correct answer: (C) Inversely as the viscosity
303.In magnetic flow meters, voltage generation is
Due to the motion of conducting fluid through an externally generated uniform field
Proportional to the fluid velocity
Both (A) and (B)
Neither (A) nor (B)
Correct answer: (C) Both (A) and (B)
304.In Newton's law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is
0.44
0.044
4.4
44
Correct answer: (A) 0.44
305.In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the _________ of its diameter.
Inverse
Square root
Second power
First power
Correct answer: (B) Square root
306.In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is
0.5
0.84
1.84
1.25
Correct answer: (C) 1.84
307.In parallel pipe problems, the
Head loss is the same through each pipe
Discharge is the same through all the pipes
Total head loss is equal to the sum of the head losses through each pipe
None of these
Correct answer: (A) Head loss is the same through each pipe
308.In power law, ξ = [A (du/dy)2 + B] then the fluid is
Newtonian
Dilatant
Thixotropic
Rheopectic
Correct answer: (A) Newtonian
309.In the complete turbulence zone (in rough pipes), the
Rough and smooth pipes have the same friction factor
Laminar film covers the roughness projections
Friction factor depends upon NRe only
Friction factor is independent of the relative roughness
Correct answer: (D) Friction factor is independent of the relative roughness
310.In the laminar boundary layer flow over a flat plate, the ratio (Δ/x) varies as: (where, 'Δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow).