MCQOPTIONS
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MCQOPTIONS
This section includes 70 Mcqs, each offering curated multiple-choice questions to sharpen your Power Systems knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
In a DG Set, bus-bar experiences |
| A. | thermal stress |
| B. | electromagnetic stress |
| C. | Both (1) and (2) |
| D. | None of the above |
| Answer» D. None of the above | |
| 52. |
If the specific speed of turbine is 800, the turbine should be |
| A. | Francis turbine |
| B. | Pelton wheel |
| C. | Kaplan turbine |
| D. | Girard turbine |
| Answer» D. Girard turbine | |
| 53. |
In context to solar energy production, the efficiency of flat plate collectors is usually: |
| A. | 20 – 30% |
| B. | 30 -50% |
| C. | 50 – 70% |
| D. | 70 – 90% |
| Answer» D. 70 – 90% | |
| 54. |
Electrostatic precipitators are used in |
| A. | Thermal power station to reduce the pollution |
| B. | Thermal power station to heat the water |
| C. | Solar power plant to generate static electricity |
| D. | Nuclear power plant to control the radiation |
| Answer» B. Thermal power station to heat the water | |
| 55. |
_______ is used for non-conventional system to generate electrical energy form. |
| A. | Diesel electrical system |
| B. | Nuclear system |
| C. | Tidal energy |
| D. | Thermal system |
| Answer» D. Thermal system | |
| 56. |
Overloading permitted in DG set is about |
| A. | 125%, 2 hrs |
| B. | 110%, 2 hrs |
| C. | 125%, 1 hr |
| D. | 110%, 1 hr |
| Answer» E. | |
| 57. |
For a diesel generating station, the useful life is expected to be around: |
| A. | 15 to 20 years |
| B. | 20 to 50 years |
| C. | 75 to 100 years |
| D. | 50 to 75 years |
| Answer» B. 20 to 50 years | |
| 58. |
A steam engine is based on which of the following thermodynamic cycles? |
| A. | Rankine cycle |
| B. | Brayton cycle |
| C. | Stirling cycle |
| D. | Carnot cycle |
| Answer» B. Brayton cycle | |
| 59. |
In steam power stations, the condenser creates a ________ at the exhaust of the turbine. |
| A. | very high pressure |
| B. | very low pressure |
| C. | very high temperature |
| D. | very low temperature |
| Answer» C. very high temperature | |
| 60. |
Hydro-generators are generally employed to run at: |
| A. | 500 rpm |
| B. | 1000 rpm |
| C. | 1500 rpm |
| D. | 3000 rpm |
| Answer» B. 1000 rpm | |
| 61. |
A power plant with high initial cost, low running and maintenance cost and with no standby losses is: |
| A. | Steam power plant |
| B. | Diesel power plant |
| C. | Nuclear power plant |
| D. | Hydro-electric power plant |
| Answer» E. | |
| 62. |
Four types of power plants have been given, out of which three are alike in some manner and one is different. Select the odd one. |
| A. | Thermal power plant |
| B. | Nuclear power plant |
| C. | Solar power plant |
| D. | Hydro-electric power plant |
| Answer» D. Hydro-electric power plant | |
| 63. |
A forebay is an enlarged body of water provided just in |
| A. | Power house |
| B. | Draft tube |
| C. | Penstocks |
| D. | Turbines |
| Answer» D. Turbines | |
| 64. |
Centrifugal pumps with backward curved blades are used in |
| A. | Forced draft fans |
| B. | Induced draft fans |
| C. | Furnace fans |
| D. | Kitchen exhaust fans |
| Answer» B. Induced draft fans | |
| 65. |
In a steam power plant, the function of _______ is to utilise the waste heat of the flue gases for heating the feed water. |
| A. | a boiler |
| B. | a superheater |
| C. | an economiser |
| D. | a condenser |
| Answer» D. a condenser | |
| 66. |
During day time, solar cells generate |
| A. | Constant D.C. voltage |
| B. | Variable D.C. voltage |
| C. | Constant A.C. voltage |
| D. | Variable A.C. voltage |
| Answer» C. Constant A.C. voltage | |
| 67. |
Pump efficiency is defined as the ratio of |
| A. | Pressure to temperature |
| B. | Temperature to pressure |
| C. | Water horsepower to pump horsepower |
| D. | Pump horsepower to water horsepower |
| Answer» D. Pump horsepower to water horsepower | |
| 68. |
A thermal station has 85% boiler efficiency, 90% turbine efficiency and 40% load factor. Determine the thermal efficiency of the station. |
| A. | 34.5% |
| B. | 36.5% |
| C. | 76.5% |
| D. | 90% |
| Answer» D. 90% | |
| 69. |
In wind power, the speed which is considered as the single most important parameter is |
| A. | Wind speed |
| B. | Peripheral speed |
| C. | Tip speed |
| D. | Blade speed |
| Answer» D. Blade speed | |
| 70. |
In which of the following power plants the availability of power is least reliable? |
| A. | Solar power plant |
| B. | Wind energy |
| C. | Tidal power plant |
| D. | Geothermal power plant |
| Answer» C. Tidal power plant | |