1. In impulse turbines with stationary blades, there is_________ in blades of the turbine.
a) Pressure change
b) Same pressure
c) Volumetric change
d) Pressure independent
Explanation: In impulse turbines, there is pressure change in blades of the turbine. There is pressure change that is developed in fluid or gas in the turbine blades. The turbine blades are in stationary condition.
2. In an outward flow reaction turbine the discharge _______
a) Increases
b) Decreases
c) Same
d) Independent
Explanation: In an outward flow reaction turbine the discharge of fluid increases. Thus, making it different from an inward flow reaction turbine.
3. Before reaching the turbine, the acceleration of the fluid takes place through the__________
a) Vane angle
b) Nozzle
c) Pump
d) Pipe
Explanation: Before the fluid reaches the turbine, the pressure head is converted into its velocity head by accelerating the fluid with a nozzle. Nozzle increases the velocity and decreases the pressure.
4.The Pelton wheel extracts energy from________
a) Vane angle
b) Moving fluid
c) Increase in temperature
d) Heat rejection
Explanation: The Pelton wheel extracts energy from moving of fluid. When the fluid flows through the Pelton wheel, a kinetic energy is developed. This kinetic energy is extracted from the moving fluid.
5. Pelton wheel is a Reaction type water turbine.
a) True
b) False
Explanation: The statement is false. The Pelton wheel is not a reaction type water turbine. It is an impulse type water turbine. The Pelton wheel extracts energy from moving of fluid. When the fluid flows through the Pelton wheel, a kinetic energy is developed.
6. The outward radial flow reaction turbine is a turbine in which direction of water flow is ___________
a) Radial direction
b) Radially inward
c) Radially outward
d) Axial direction
Explanation: The name itself indicates that flow is in radial direction and flowing from center towards outer periphery.
7. Outward flow reaction turbine is used in practical applications
a) True
b) False
Explanation: There are several limitations of outward flow reaction turbine hence it is used in practical applications.
8. The energy available at inlet for outward reaction flow turbine is ____________
a) Potential
b) Kinetic energy
c) Pressure energy
d) Pressure energy and Kinetic energy
Explanation: Since it is reaction turbine energy available at inlet consists of both pressure energy and kinetic energy.
9. Centrifugal head in Outward flow reaction turbine _____________
a) Increases
b) Decreases
c) Remains constant
d) Gradually decreases
Explanation: Because centrifugal head is proportional to difference of outlet blade velocity and inlet blade velocity .
Here, u1<u2 so centrifugal head increases.
10. Discharge in outward flow reaction turbine ____________
a) Increases
b) Decreases
c) Remains constant
d) Gradually decreases
Explanation: Discharge in outward flow reaction turbine increase because area increases to keep velocity constant.