Civil Engineering Archives

1641. Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is________________?

A. less than d

B. between d and 1.5 d

C. between 1.5 d and 2d

D. greater than 2d

✅ The correct answer is option A.

1642. The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?

A. 0.223 R

B. 0.423 R

C. 0.577 R

D. 0.707 R

✅ The correct answer is option A.

1643. Two pipe systems are said to be equivalent when_________________?

A. head loss and discharge are same in two systems

B. length of pipe and discharge are same in two systems

C. friction factor and length are same in two systems

D. length and diameter are same in two systems

✅ The correct answer is option A.

1644. 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

✅ The correct answer is option A.

1645. The Prartdtl mixing length is_________________?

A. zero at the pipe wall

B. maximum at the pipe wall

C. independent of shear stress

D. none of the above

✅ The correct answer is option A.

1646. Size of a venturimeter is specified by________________?

A. pipe diameter

B. throat diameter

C. angle of diverging section

D. both pipe diameter as well as throat diameter

✅ The correct answer is option A.

1647. Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by________________?

A. 5%

B. 10%

C. 15%

D. 20%

✅ The correct answer is option A.

1648. In case of an airfoil, the separation of flow occurs________________?

A. at the extreme rear of body

B. at the extreme front of body

C. midway between rear and front of body

D. any where between rear and front of body depending upon Reynolds number

✅ The correct answer is option A.

1649. The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is________________?

A. 1/3

B. 1/4

C. 1/2

D. 2/3

✅ The correct answer is option A.

1650. In a forced vortex motion, the velocity of flow is________________?

A. directly proportional to its radial distance from axis of rotation

B. inversely proportional to its radial distance from the axis of rotation

C. inversely proportional to the square of its radial distance from the axis of rotation

D. directly proportional to the square of its radial distance from the axis of rotation

✅ The correct answer is option A.