FREE Bachelor of Mechanical Engineering Hydraulic Machines Questions and Answers

Question 1

The category of a hydraulic coupling is .

Accepted Answer

Energy transfer machines

Answer

A hydraulic coupling is a device used to transmit rotational mechanical power. It functions by transferring kinetic energy from a rotating input shaft (impeller) to an output shaft (turbine) via a fluid, typically oil. Therefore, it falls under the category of energy transfer machines, as it facilitates the movement of energy from one component to another without generating or absorbing it in a net sense.

Question 2

The hydraulic energy that is converted into electricity is .

Accepted Answer

Hydroelectric power

Answer

Hydroelectric power is the specific term for electricity generated by harnessing the energy of moving water. In hydroelectric power plants, the potential energy of water stored at a height is converted into kinetic energy as it flows downwards, which then drives turbines connected to generators to produce electricity. This process directly converts hydraulic energy into electrical energy.

Question 3

What is currently the least expensive method of generating power?

Accepted Answer

Hydroelectric power

Answer

While initial construction costs for hydroelectric power plants can be significant, their operational and maintenance costs are remarkably low compared to other power generation methods. Hydroelectric power utilizes a free and renewable fuel source (water), resulting in no fuel costs and minimal environmental emissions during operation. This makes it one of the most cost-effective methods for generating electricity over its long operational lifespan.

Question 4

A reaction turbine with inward radial flow is called .

Accepted Answer

Francis turbine

Answer

The Francis turbine is a type of reaction turbine characterized by its inward radial flow design. Water enters the runner radially inward, flows through the blades, and exits axially. This design allows it to efficiently operate under a wide range of heads and flows, making it one of the most common types of hydraulic turbines used for medium-head applications.

Question 5

Axial flow reaction turbines of particular significance are .

Accepted Answer

Propeller and Kaplan turbines

Answer

Propeller and Kaplan turbines are both classified as axial-flow reaction turbines, meaning water flows parallel to the axis of rotation through the runner. The Kaplan turbine is an advanced version of the propeller turbine, distinguished by its adjustable runner blades. This adjustability allows Kaplan turbines to maintain high efficiency over a broader range of flow rates and heads, making them particularly significant for variable load conditions.

BME - Bachelor of Mechanical Engineering Practice Test

BME - Bachelor of Mechanical Engineering Practice Test

FREE Bachelor of Mechanical Engineering Hydraulic Machines Questions and Answers