Power Generation MCQs Part 31

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Power Generation MCQs Part 31

A hydroelectric power plant has head of 325 m and has an average flow of 1400 m³/s

A hydroelectric power plant has head of 325 m and has an average flow of 1400 m³/s. The reservoir has an area of 6400 km². The available hydroelectric power is:

  1. 4459MW
  2. 2229.5MW
  3. 1114.75MW
  4. 891.8MW

Correct answer: 1. 4459MW

Solution:

Formula for available hydroelectric power P is: P = 9.8 QH kW

——————–

P = 9.8 * 1400 * 325 kW = 4459 * 10³ kW = 4459 MW

The load curve of power station is of

The load curve of power station is of:

  1. Always negative slope
  2. Always zero slope
  3. Always positive slope
  4. Any of above

Correct answer: 4. Any of above

A power supply has domestic load having maximum demand of 2000 kW

A power supply has domestic load having maximum demand of 2000 kW. If diversity factor and demand factor are 1.15 and 0.8 respectively, then connected domestic load is:

  1. 2200 
  2. 2250 
  3. 2300 
  4. 2350 

Correct answer: 2. 2250 

Solution:

Sum of max demands of different domestic consumers = Max domestic demand * Diversity factor = 2000 * 1.15 = 2300 kW

——————–

Connected domestic load = 2300/Demand factor = 2300/0.8 = 2875 kW

Overall efficiency of a steam power station is given by

Overall efficiency of a steam power station is given by:

  1. Overall efficiency = Thermal Efficiency * Electrical efficiency
  2. Overall efficiency = Thermal Efficiency * Mechanical efficiency
  3. Overall efficiency = Thermal Efficiency * Prime mover efficiency
  4. None of these

Correct answer: 1. Overall efficiency = Thermal Efficiency * Electrical efficiency

A base load power plant has capacity of 18 MW

A base load power plant has capacity of 18 MW. The annual output of power plant is 101.35 * 10^6 kWh. The annual load factor of station is:

  1. 40.3kW
  2. 52.3kW
  3. 64.3%
  4. 76.3%

Correct answer: 3. 64.3%

Solution:

Annual load factor = 101.35 * 10^6/(18 * 10^3 * 8760) = 0.642  = 64.3%

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