CHAPTER 9 – HYDROELECTRIC PLANT

In turbine installation, the air is removed from the condenser by ________.

• A. Air pump

• B. Air injector

• C. Air ejector

• D. Air jet

The primary purpose of a turbine in a fluid loop is to:

• A. Add energy to the flow

• B. Add mass to the flow

• C. Extract energy from the flow

• D. None of the above

A vena contracta in a fluid jet issuing through a hole in a plate is located approximately:

• A. 10 diameters downstream of the hole

• B. At jet’s minimum diameter

• C. At the orifice minimum diameter

• D. At the orifice maximum diameter

The following are all examples of indirect (secondary) miscellaneous methods to measure flow except:

• A. Turbine and propeller meters

• B. Magnetic flow meters

• C. Positive displacement meters

• D. Hot-wire anemometers

One could expect the possibility of Reynolds number similarity in all of the following cases except:

• A. Pumps

• B. Fans

• C. Turbines

• D. Weirs

One could expect the possibility of Froude number similarity in all of the following cases except:

• A. Surface ships

• B. Surface wave motion

• C. Flow over weirs

• D. Closed-pipe turbulent pipe flow

One could expect the possibility of Froude number similarity in all of the following cases except:

• A. Motion of a fluid jet

• B. Flow over spillways

• C. Surge and flood waves

• D. Subsonic airfoils

In fluid flow, linear momentum is:

• A. A vector quantity equal to the product of mass and velocity

• B. A scalar quantity equal to the product mass and velocity

• C. A scalar quantity equal to the product of force and length of time is applied

• D. The change in impulse

All of the following fluid phenomena are based on the force momentum principle of a flowing fluid except:

• A. Turbines

• B. Pelton wheels

• C. Diesel automobile engines

• D. Jet engines

The fact that a fluid’s velocity increases as the cross sectional area of the pipe through which it flow decreases is due to:

• A. Bernoull’s equation

• B. The continuity equation

• C. The momentum equation

• D. The perfect gas law