Top 1000+ Solved Fluid Mechanics (FM) MCQ Questions Answer
Q. To generate 8.1 MW under a head of 81m while working at a speed of 540rpm, what type ofturbine is suitable?
a. pelton wheel
b. francis turbine
c. kaplan turbine
d. propeller turbine
Q. A turbine works at 20 m head and speed of 500 rpm. Its 1:2 scale model to be tested at samehead should have a rotational speed of
a. 1000rpm
b. 750rpm
c. 500rpm
d. 250rpm
Q. Mechanical efficiency of a turbine is the ratio of
a. power at the inlet to the power at the shaft of turbine
b. power at the shaft to the power given to the runner
c. power at the shaft to the power at the inlet of turbine
d. none of the above
Q. The overall efficiency of the turbine is the ratio of
a. power at the inlet of the turbine to the power at the shaft
b. power at the shaft to the power given to the runner
c. power at the shaft to the power at the inlet of turbine
d. none of the above
Q. Specific speed of the turbine is defined as the speed at which the turbine runs when
a. working under unit head and discharging one liter per second
b. working under unit head and develops unit horse power
c. develops unit horse power and discharges one liter per second
d. none of the above
Q. The Unit speed is the speed of a turbine when it is working
a. under unit head and develops unit power
b. under unit head and discharge one m3/sec
c. under unit head
d. none of the above
Q. The ratio of actual work available at the turbine to the energy imparted to the wheel is known as_____________ efficiency.
a. hydraulic
b. mechanical
c. overall
d. none of the above
Q. Which of the following turbine is preferred 0 to 25m head of water?P
a. ge 4 of 11a) pelton wheel
b. kaplan turbine
c. francis turbine
d. none of the above
Q. A Francis turbine is used when the available head of water is
a. 0 to 25m
b. 25 to 250m
c. above 250m
d. none of these
Q. The differential equation of the gradually varied flow can be written by using Manning’s Formulafor the case off a wide rectangular channel as (dy/dx) =
a. s0{[1-(yn/y)3.33]/[1-(yn/y)3]}
b. s0{[1-(yc/y)3.33]/[1-(yc/y)3]}
c. s0{[1-(yn/y)3]/[1-(yn/y)3]}
d. s0{[1-(yo/yc)3]/[1-(yn/y)3.33]}
Q. If E = specific energy at a section in a gradually varied flow, then (dE/dx) =
a. s0+sf
b. s0-sf
c. sf-s0
d. sfs0-1
Q. ationSelect the correct answer using the codes given below:
a. 1,2 and 3
b. 1 and 3 only
c. 1 and 2 only
d. 2 and 3 only
Q. Calculate the value of rate of change of specific energy for a triangular channel having depth3.5m and the side slope is 1H:2V. Given: V=2.5m/s, dy/dx= 8.6x10-4
a. 3.74x10-4m
b. 4.47 x10-4m
c. 5.47 x10-4m
d. 6.47 x10-4m