# Flow Through Pipes - Mechanical Engineering (MCQ) questions and answers

1)   Minor losses occur due to

a. sudden enlargement in pipe
b. sudden contraction in pipe
c. bends in pipe
d. all of the above
 Answer  Explanation ANSWER: all of the above Explanation: No explanation is available for this question!

2)   What is Darcy-Weisbach formula for heat loss due to friction?

Where,
f = Darcy's coefficient of friction

a. hf = (f l V2) / (g d)
b. hf = (f l V2) / (2 g d)
c. hf = (4 f l V2) / (2 g d)
d. hf = (16 f l V2) / (2 g d)
 Answer  Explanation ANSWER: hf = (4 f l V2) / (2 g d) Explanation: No explanation is available for this question!

3)   What is the formula for determining the size of equivalent pipe for two pipes of lengths L1, L2 and diameters d1, d2 respectively?

Where,
L = L1 + L2

a. (L / d) = (L1 / d1) + (L2 / d2)
b. (L / d2 ) = (L1 / d12) + (L2 / d22)
c. (L / d3) = (L1 / d13 ) + (L2 / d23)
d. (L / d5) = (L1 / d15 ) + (L2 / d25)
 Answer  Explanation ANSWER: (L / d5) = (L1 / d15 ) + (L2 / d25) Explanation: No explanation is available for this question!

4)   What is the correct formula for loss at the exit of a pipe?

a. hL = 0.5 (V2 / 2g)
b. hL = (V2 / 2g)
c. hL = (2 V2 / g)
d. hL = (4 V2 / g)
 Answer  Explanation ANSWER: hL = (V2 / 2g) Explanation: No explanation is available for this question!

5)   Minor losses do not make any serious effect in

a. short pipes
b. long pipes
c. both the short as well as long pipes
d. cannot say
 Answer  Explanation ANSWER: long pipes Explanation: No explanation is available for this question!

6)   The highest point of syphon is called as

a. syphon top
b. summit
c. reservoir
d. none of the above
 Answer  Explanation ANSWER: summit Explanation: No explanation is available for this question!

7)   What is a syphon?

a. A long bend pipe used to carry water from a reservoir at a higher level to another reservoir at a lower level when two reservoirs are separated by a hill
b. A long bend pipe used to carry water from a reservoir at a lower level to another reservoir at a higher level with some work input when two reservoirs are separated by a hill
c. A long bend pipe used to carry water from one reservoir to another reservoir when two reservoirs are at same elevation
d. Unpredictable
 Answer  Explanation ANSWER: A long bend pipe used to carry water from a reservoir at a higher level to another reservoir at a lower level when two reservoirs are separated by a hill Explanation: No explanation is available for this question!

8)   What is the effect of change in Reynold's number on friction factor in turbulent flow?

a. As the Reynold's number increases the friction factor increases in turbulent flow
b. As the Reynold's number increases the friction factor decreases in turbulent flow
c. change in Reynold's number does not affect the friction factor in turbulent flow
d. unpredictable
 Answer  Explanation ANSWER: As the Reynold's number increases the friction factor decreases in turbulent flow Explanation: No explanation is available for this question!

9)   The friction factor in fluid flowing through pipe depends upon

a. Reynold's number
b. relative roughness of pipe surface
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: both a. and b. Explanation: No explanation is available for this question!

10)   The head loss through fluid flowing pipe due to friction is

a. the minor loss
b. the major loss
c. both a. and b.
d. none of the above
 Answer  Explanation ANSWER: the major loss Explanation: No explanation is available for this question!