# Hydroelectric Power Plant MCQs

Explore the working of hydroelectric power with Electrical Engineering XYZ’s MCQs. Dive into topics like dam mechanics, turbine types, power generation, and environmental impacts. Perfect for students and professionals eager to enhance their understanding of renewable energy systems and power generation through interactive learning MCQs. Join us to master hydroelectric fundamentals effectively!

## Structure which protects the conduit of the dam

The structure which protects the conduit of the dam against the abnormal pressure of water:

1. Penstock
2. Surge tank
3. Reservoir
4. Value house

Correct answer: 2. Surge tank

Explanation: A surge tank is a structure used to protect the hydraulic system of a dam, specifically the penstock (the conduit that carries water from the reservoir to the turbines), from abnormal pressure changes. These changes can be caused by rapid valve closures at the turbine inlet. By absorbing sudden rises or drops in water pressure, surge tanks help prevent potential damage to the penstock and other components of the hydroelectric power system, maintaining the system’s stability and efficiency.

## Open conduits in dams don’t require surge tanks

Open conduits in dams don’t require surge tanks:

1. True
2. False

Correct answer: 1. True

Explanation: Open conduits in dams, such as spillways or channels that carry water over or around a dam without fully enclosing the flow, do not typically require surge tanks because surge tanks are used to control pressure changes and water hammer in closed conduits like pipelines. Surge tanks act as buffers to absorb sudden changes in water pressure, which are not generally a concern in open conduits where the water is exposed to the atmosphere and can freely adjust. Thus, the specific function of surge tanks does not apply to open conduit systems in dams.

## The hydroelectric power plant is constructed in

The hydroelectric power plant is constructed in:

1. Hilly areas
2. Urban areas
3. Deserts
4. Swamps

Correct answer: 1. Hilly areas

Explanation: Hydroelectric power plants are primarily constructed in hilly areas because these locations provide the necessary conditions such as elevation differences and water flow required to generate hydroelectric power. In hilly areas, rivers can be dammed to create a reservoir, and the gravitational force of the falling water from a height is used to drive turbines, which generate electricity. This geographical setup is not typically available in urban areas, deserts, or swamps, making hilly areas the most suitable choice for hydroelectric plants.

## The most appropriate term which explains flow in Pelton turbine

The most appropriate term which explains flow in Pelton turbine:

1. Axial
2. Diagnol
3. Tangential
4. None of these

Correct answer: 3. Tangential

## Four statements about impulse turbine are presented, mark the incorrect term

Four statements about impulse turbine are presented, mark the incorrect term:

1. It works on the principle of reaction
2. Half of the pressure is converted into kinetic energy
3. Pelton turbine is an impulse turbine
4. Francis turbine is not an impulse turbine

Correct answer: 2. Half of the pressure is converted into kinetic energy

## The water stored in the dam is referred as

The water stored in the dam is referred as:

1. Grill
2. Pondage
3. Damage
4. Gate

Correct answer: 2. Pondage

## Head vs Water Quantity Required

Compare to medium head Hydroelectric plant, a _________ head plant required more amount of water to generate same energy:

1. Low
2. High

Correct answer: 1. Low

The turbine which is completely submerged in water:

1. Impulse
2. Reaction
3. Both of these
4. None of these

Correct answer: 2. Reaction turbine

## After passing through turbine the water is discharged in to

After passing through turbine the water is discharged in to:

1. Surge tank
2. Tailrace
3. Forebay
4. Reservoir

Correct answer: 2. Tail race

## Hydroelectric power plants are used as

Hydroelectric power plants are used as:

2. Peak load plants
3. Both of these
4. None of these

## The turbine which is recommended for extremely low heads

The turbine which is recommended for extremely low heads:

1. Kaplan turbine
2. Pelton turbine
3. Any impulse turbine
4. Bulb turbine

Correct answer: 4. Bulb turbine

## Travelling gate is

Travelling gate is:

1. A type of stocker
2. Used to control the flow of water in the dam
3. A used in ball mills
4. Used in boilers for feeding water

Correct answer: 1. A type of stocker

## The closely related term which explains the flow in the Deriaz turbines

The closely related term which explains the flow in the Deriaz turbines:

1. Axial
2. Diagnol
3. Tangential
4. None of these

Correct answer: 2. Diagnol

## The hydrograph is a plot between

The hydrograph is a plot between:

1. Discharge and percentage of time
2. Discharge and flow time
3. Cumulative flow and time
4. None of these

Correct answer: 2. Discharge and flow time

## A high head power plant uses

A high head power plant uses:

1. Francis
2. Kaplan
3. Propeller
4. Pelton

Correct answer: 4. Pelton

## The hydro turbine which turns at lowest RPM

The hydro turbine which turns at lowest RPM:

1. Francis
2. Kaplan
3. Propeller
4. Pelton

Correct answer: 4. Pelton

## 1 day-second-meter in Hydroelectric power station equals

1 day-second-meter in Hydroelectric power station equals:

1. 50,000 m3
2. 68,300 m3
3. 86,400 m3
4. 92,242 m3

Correct answer: 3. 86,400 m3

Solution: 60 * 60 * 24 = 86,400 m3

## Reaction turbines utilize

Reaction turbines utilize:

1. Pressure of fluid
2. Motion of fluid
3. Both of these
4. None of these

Correct answer: 1. Pressure of fluid

## Which one of the following is constant pressure turbine

Which one of the following is constant pressure turbine:

1. Kaplan
2. Francis
3. Propeller
4. Pelton

Correct answer: 4. Pelton

Pelton turbine is:

1. Impulse turbine
2. Reaction turbine
3. Both of these
4. None of these

Correct answer: 1. Impulse turbine

For high values of RPM such as >1000 RMP the recommended type of turbine is:

1. Pelton
2. Kaplan
3. Francis
4. None of these

Correct answer: 2. Kaplan

Usually which type of turbine is recommended for the axial flow:

1. Pelton
2. Kaplan
3. Deriaz
4. Francis