The losses are more in_________________?

Related Mcqs:

1. The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to_______________?

   A. PA
   B. pA sin 9
   C. pA cos 9
   D. pA tan 9

   where p is pressure intensity at centroid of area and A is area of plane surface

2. The continuity equation pi V,A,= p2V2A2 is based on the following assumption regarding flow of fluid______________?

   A. steady flow
   B. uniform flow
   C. incompressible flow
   D. frictionless flow

   where pi and p2 are mass densities

3. Which of the following statements is correct ?

   A. Lower critical Reynolds number is of no practical significance in pipe flow problems.
   B. Upper critical Reynolds number is significant in pipe flow problems.
   C. Lower critical Reynolds number has the value 2000 in pipe flow
   D. Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow

4. When an ideal fluid flows past a sphere________________?

   A. highest intensity of pressure occurs around the circumference at right angles to flow
   B. lowest pressure intensity occurs at front stagnation point
   C. lowest pressure intensity occurs at rear stagnation point
   D. total drag is zero

5. The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?

   A. 0.40 cm
   B. 0.20 cm
   C. 0.10 cm
   D. 0.05 cm

   Assume that boundary layer is entirely laminar

6. For laminar flow in a pipe of circular cross-section, the Darcy’s friction factor f is________________?

   A. directly proportional to Reynolds number and independent of pipe wall roughness
   B. directly proportional to pipe wall roughness and independent of Reynolds number
   C. inversely proportional to Reynolds number and indpendent of pipe wall roughness
   D. inversely proportional to Reynolds number and directly proportional to pipe wall roughness

7. If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?

   A. x
   B. x
   C. x
   D. x/7

8. If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is__________________?

   A. 4/3
   B. 3/2
   C. 9/4
   D. 27/8

9. A vertical rectangular plane surface is submerged in water such that its top and bottom surfaces are 1.5 m and 6.0 m res-pectively below the free surface. The position of center of pressure below the free surface will be at a distance of________________?

   A. 3.75 m
   B. 4.0 m
   C. 4.2m
   D. 4.5m

10. The viscosity of a gas_______________?

    A. decreases with increase in temperature
    B. increases with increase in temperature
    C. is independent of temperature
    D. is independent of pressure for very high pressure intensities