1631. The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is_____________________?
A. 32 km
B. 20 km
C. 8 km
D. 4 km
✅ The correct answer is option A.
Civil Engineering
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1632. 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
✅ The correct answer is option B.
1633. The theoretical value of coefficient of contraction of a sharp edged orifice is_______________?
A. 0.611
B. 0.85
C. 0.98
D. 1.00
✅ The correct answer is option A.
1634. Coefficient of contraction for an external cylindrical mouthpiece is_________________?
A. 1.00
B. 0.855
C. 0.7H
D. 0.611
✅ The correct answer is option A.
1635. The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?
A. 0.423 D
B. 0.577 D
C. 0.223 D
D. 0.707 D
✅ The correct answer is option B.
1636. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?
A. 1/3 R
B. 1/2 R
C. 2/3 R
D. 3/4R
✅ The correct answer is option A.
1637. The discharge of a liquid of kinematic viscosity 4 cm2/sec through a 8 cm dia-meter pipe is 3200n cm7sec. The type of flow expected is__________________?
A. laminar flow
B. transition flow
C. turbulent flow
D. not predictable from the given data
✅ The correct answer is option A.
1638. Stanton diagram is a______________?
A. log-log plot of friction factor against Reynolds number
B. log-log plot of relative roughness against Reynolds number
C. semi-log plot of friction factor against Reynolds number
D. semi-log plot of friction factor against relative roughness
✅ The correct answer is option A.
1639. Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is__________________?
A. slightly less
B. slightly more
C. nearly half
D. equal
✅ The correct answer is option A.
1640. Equation of continuity is based on the principle of conservation of_________________?
A. mass
B. energy
C. momentum
D. none of the above
✅ The correct answer is option A.