This set of Hydraulic Machines Multiple Choice Questions & Answers (MCQs) focuses on “Constant Speed Curves”.
1. Constant speed curves are also called as _______
a) Main characteristic curves
b) Turbine curves
c) Tail race curves
d) Impeller curves
View Answer
Explanation: Constant speed curves are also called as main characteristic curves. It helps in determining the overall efficiency of the turbine by drawing curves with different set of parameters that play a major role in determining the performance of the turbine.
2. Constant speed curve is denoted as _____
a) T
b) V
c) c
d) V
View Answer
Explanation: The constant speed curve is denoted as ‘c’. It is also called as called as the main characteristic curve. It plays an important role in determining the performance of the turbine.
3. Constant speed curves are ________
a) Scalar quantities
b) Vector quantities
c) Constant quantities
d) Different conditions
View Answer
Explanation: Constant speed curves detect the performance at different conditions. Constant speed curves are vector quantities.
4. Constant speed is measured _________
a) Mechanically
b) Electrically
c) Chemically
d) Thermally
View Answer
Explanation: Constant speed is measured is measured mechanically by adjusting the flow of fluid using the percentage variations in a sluice gate. It helps in determining the overall efficiency of the turbine.
5. Constant speed curves are determined by the _________
a) Arc length
b) Power
c) Heat
d) Temperature
View Answer
Explanation: Constant speed curves are determined by the unit arc length. Constant speed is measured is measured mechanically by adjusting the flow of fluid using the percentage variations in a sluice gate. It helps in determining the overall efficiency of the turbine.
6. Which component is necessary for writing the velocity equation?
a) Cos component
b) Sine Component
c) Cos and sine component
d) Independent
View Answer
Explanation: Both the cosine and sine component are necessary for determining and writing down the equation for the velocity. It also helps to determine the characteristic curves using the equation.
7. Which among the following is not a shape for a curve?
a) Logarithmic curve
b) Helix curve
c) Straight curve
d) Speed curve
View Answer
Explanation: Speed curve is not a shape of a characteristic curve. Constant speed is measured is measured mechanically by adjusting the flow of fluid using the percentage variations in a sluice gate. It helps in determining the overall efficiency of the turbine.
8. How do we plot points in a curve?
a) Analytical approach
b) General approach
c) Tail approach
d) Head approach
View Answer
Explanation: The plotting of curves take place in an analytical approach. It is very essential for the plotting of the characteristic points.
9. Plotting sine curve will take place along the _________
a) y axis
b) x axis
c) z axis
d) x and z
View Answer
Explanation: Plotting sine curve will take place along the x axis. It is the motion of the x-y plane that will occur in space.
10. In analytical approach, dp= __________
a) vdt
b) v
c) dt
d) dx
View Answer
Explanation: In any sort of analytical approach, the equation for dp = vdt. It takes place when the sine component and cosine components equal to one.
11. The equation is general approach is called as central difference.
a) True
b) False
View Answer
Explanation: The equation is general approach is called as central difference. All the characteristic curves that specify different parameters in a turbine are drawn with respect to its unit speed.
12. The approximate value of the constant speed curve is given by ratio of ________
a) dy/dp
b) dx/dp
c) dt/dx
d) dt/dy
View Answer
Explanation: The approximate value of the constant speed curve is given by ratio of dy/dp. It helps in determining the overall efficiency of the turbine by drawing curves with different set of parameters that play a major role in determining the performance of the turbine.
13. In constant speed curves, the velocity is kept a constant varying its head.
a) True
b) False
View Answer
Explanation: Constant speed curves are also called as operating characteristic curves. It helps in determining the overall efficiency of the turbine by drawing curves with different set of parameters that play a major role in determining the performance of the turbine.
14. The performance of a characteristic curve is kept at a high value.
a) True
b) False
View Answer
Explanation: Yes, In all the characteristic curves, the performance is aimed at the maximum value. It helps in determining the overall efficiency of the turbine by drawing curves with different set of parameters that play a major role in determining the performance of the turbine.
Sanfoundry Global Education & Learning Series – Hydraulic Machines.
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