Top 1000+ Solved Fluid Mechanics (FM) MCQ Questions Answer
Q. The horizontal portion of the draft tube is usually bent to prevent entry of air from the exit end.
a. True
b. False
c. none
d. none
Q. The efficiency of the draft tube is ratio of
a. Pressure energy by kinetic energy
b. Kinetic energy by Pressure energy
c. Kinetic energy into mechanical energy
d. Pressure into mechanical
Q. Draft tubes are not used in which of the following turbines?
a. Francis
b. Reaction
c. Kaplan
d. Pelton
Q. The draft tube at the exit of the nozzle increases the
a. Temperature
b. Pressure
c. Volume of the flow
d. Density of flow
Q. Efficiency of a draft tube gives
a. Temperature difference
b. Pressure difference
c. Kinetic energy difference
d. Density of flow
Q. Cavitation in a draft tube occurs when
a. Temperature difference
b. Pressure drop
c. Kinetic energy difference
d. Density of flow
Q. Which of the following assumptions are true in case of GVF?
a. flow is not steady
b. stream lines are parallel
c. pressure distribution is not hydrostatic
d. channel has varying alignment and shape
Q. What happens to depth of flow when there is obstruction in path
a. remains same
b. increases
c. decreases
d. flow stops
Q. Calculate the value of Froud’s number if the ratio of rate of change of specific energy and rate ofchange of depth is 0.9.
a. 0.29
b. 0.30
c. 0.31
d. 0.32
Q. If the difference between specific energies is 2m, calculate the rate of change of specificenergies if the length of backwater curve is 26314 m.
a. 6.6x10-5m
b. 7.6 x10-5m
c. 8.6 x10-5m
d. 9.6 x10-5m
Q. When gravitational force is equal to the friction drag, what type of depth is formed?P
a. ge 9 of 11a) critical depth
b. normal depth
c. cylindrical depth
d. conical depth
Q. Determine the length of backwater curve if E1=2.8m, E2=5.6m, S0=0.00009, Sf= 0.00004.
a. 26000m
b. 36000m
c. 46000m
d. 56000m
Q. Calculate the bed slope of the channel if the slop of the energy line is 0.00024 and the length ofbackwater curve is 104166.67m. If E1-E2= 3m.
a. 2.28x 10-5
b. 3.28 x10-5
c. 4.28 x10-5
d. 5.28 x10-5
Q. calculate the frictional slope of a triangular channel having depth 2.5m and side slope of 1H:2V.If the rate of change of specific energy is 1.6 x10-5m/s, If V= 1.57 m/s.
a. 5.53 x10-4m
b. 6.53 x10-4m
c. 7.53 x10-4m
d. 8.53 x10-4m