MCQs and Answers

100 TOP FLUID MECHANICS Interview Questions and Answers <—-CLICK HERE

51. 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
Ans: a
52. The major loss of energy in long pipes is due to
a) sudden enlargement
b) sudden contraction
c) gradual contraction or enlargement
d) friction
Ans: d
53. Coefficient of contraction for an external cylindrical mouthpiece is
a) 1.00
b) 0.855
c) 0.7H
d) 0.611
Ans: a
54. Which of the following has highest coefficient of discharge ?
a) sharp edged orifice
b) venturimeter
c) Borda’s mouthpiece running full
d) CipoUetti weir
Ans: b
55. In a Sutro weir, the discharge is proportional to
a) H1/2
b) H3/2
c) H5/2
d) H
where H is head.
Ans: d

a) 0.611
b) 0.707
c) 0.855
d) 1.00
Ans: b

a) velocity
b) discharge
c) head
d) pressure
Ans: b

a) equal to atmospheric
b) less than atmospheric
c) more than atmospheric
d) none of the above
Ans: b

a) is independent of Reynolds number
b) decreases with higher Reynolds number
c) is equal to the coefficient of discharge of venturimeter
d) none of the above
Ans: c

a) Coefficient of contraction of a venturimeter is unity.
b) Flow nozzle is cheaper than venturimeter but has higher energy loss.
c) Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined.
d) None of the above statement is correct.
Ans: d