Hydroelectric Power Plant MCQ

Electrical Engineering MCQ Questions on Hydro Power Plant. Solved MCQ on Hydro Power Plant with brief answers.


Hydroelectric power plant uses the potential energy of water for electric power generation. Water is stored at a certain height from where it is brought down hitting the turbines at the bottom. The turbines are synchronized with a generator and produce electricity at the output.

Surge tank in Hydropower plant

Surge tank in Hydropower plant:

  1. Is the main reservoir
  2. Absorbs pressure swing
  3. Reduce surge frequency of electricity
  4. Is used with Kaplan turbines

Correct answer: 2. Absorbs pressure swing


What is the Role of penstock in Hydropower plant

Role of penstock:

  1. Carries water to the turbine
  2. Absorbs pressure swing
  3. Is used with Kaplan turbines
  4. Reduces load

Correct answer: 1. Carries water to the turbine


Reaction turbines are used for

Reaction turbines are employed for:

  1. Low heads
  2. Medium heads
  3. Both of these
  4. None of these

Correct answer: 3. Both of these


150 m High Hydropower plant Numerical Problem

A hydro-electric power plant with 150-meter head and 8*10^9 kg of water will generate how much energy if overall efficiency is 82%

  1. 3.82 * 10^13 kWh
  2. 4.98 * 10^13 kWh
  3. 9.65 * 10^13 kWh
  4. 9.98 * 10^13 kWh

Correct answer: 3. 9.65 * 10^13 kWh


Impulse turbines are used for

Impulse turbines are used for:

  1. Low heads
  2. Medium heads
  3. Both of these
  4. None of these

Correct answer: 4. None of these

Find explanation here

Method used to produce electricity in hydroelectric power plant

Of given methods, which method is used to produce electricity in a hydroelectric power plant:

  1. Heat energy of water converted to mechanical energy
  2. Potential energy of water converted to mechanical energy
  3. Ionization of water to obtain chemical energy
  4. All of these

Correct answer: 2. Potential energy of water converted to mechanical energy

Which statement about hydroelectric power plant is wrong

Of given statements which statement about hydroelectric power plant is wrong:

  1. Its capital cost is very high
  2. A long duration of time is needed for building a hydroelectric power plant
  3. A hydroelectric power plant can supply power to fluctuating loads
  4. Per unit cost of hydro power plant is higher than diesel plant

Correct answer: 4. Per unit cost of hydro power plant is higher than diesel plant

What type of hydropower plant does not use a dam

What type of hydropower plant does not use a dam:

  1. Impoundment
  2. Run of river
  3. Pumped storage

Correct answer: 2. Run of river

Water from run-of-river facility channels a portion of a river through a canal or penstock. A run-of-river power plant may not require the use of a dam for storage purposes.

Which of the following is not an advantage of hydroelectric power plant mcq#9

Of mentioned points which of the following is not an advantage of hydroelectric power:

  1. It is a renewable source
  2. No standby losses
  3. Low running cost
  4. Continuous power supply

Correct answer: 4. Continuous power

Explanation: The actual output of a power plant is dependent on the flow rate of water. Since the flow rate of water is variable the continuous power may not be assured all the time. So Continuous power supply is not an advantage of hydroelectric power

Also the hydroelectric power plant is cheapest in terms of maintenance and operations.

More Hydroelectric Power Plant MCQ

  1. The Power Plant with minimum running cost
  2. Continent having highest installed capacity of hydropower
  3. Draft tube is provided in hydropower plant to
  4. In hydropower station, the graphical representation of discharge as function of time is known as
  5. The hydroelectric power plant having flow rate 1000 cubic meter/s and 800 m high head having plant efficiency of 96% will generate how many kilowatts
  6. The generating capacity of a hydroelectric plant is represented using equation
  7. Usually the hydroelectric power plants utilize which type of synchronous generators

One thought on “Hydroelectric Power Plant MCQ

  • September 10, 2020 at 3:59 pm
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    I am electraian

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