electrical-power-generation-mcqs-part-7

Electrical Power Generation MCQs Part 7

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a. Pelton turbine is:

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

Correct answer: 1. Impulse turbine

b. 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

c. Usually __________ type of turbine is recommended for the axial flow:

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

Correct answer: Kaplan

d. The power plant/station which is strongly recommended for dealing with the peak load conditions is:

  1. Hydroelectric power station
  2. Diesel power station
  3. Tidal unit station
  4. Steam power station

Correct answer: 2. Diesel power station

e. The statement: Size of diesel engine increases with the increase of cutoff ratio. is:

  1. Wrong
  2. Correct
  3. Partially correct
  4. Size of the engine has nothing to do with the cutoff ratio

Correct answer: 1. Wrong

Explanation: Size of engine increases with the decrease of cutoff ratio.

f. A Hydro-electric power station is considered to be Super-hydro electric power station if its capacity is:

  1. 1 – 10 MW
  2. 10 – 100 MW
  3. 100 – 1000 MW
  4. > 1000 MW

Correct answer: 4. 1000 MW

g. The correct statement about cooling water used in the condenser of coal power station:

  1. The cooler the water, the lower will be the efficiency
  2. The cooler the water, the higher will be the efficiency
  3. The temperature of the water does not impact the efficiency
  4. Cooling water should never be used in the condenser

Correct answer: 2. The cooler the water, the higher will be the efficiency

h. The steam in reaction turbine ________ expands in stationery nozzles:

  1. Fully
  2. Partially

Correct answer: 2. Partially

i. The efficiency of modern generators in coal power stations can be up to:

  1. 44%
  2. 67%
  3. 89%
  4. 96%

Correct answer: 4. 96%

j. A two pole generator in 60 Hz grid should be turned at ___________:

  1. 1800 RPM
  2. 3600 RPM
  3. 7200 RPM
  4. 9600 RPM

Correct answer: 1. 3600 RPM

Explanation: Speed = 120 * f / P

Speed = 120 * 60 / 2 = 3600 RPM

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