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1) The gas turbine power plant mainly uses which among the following fuels? a. Coal and Peat b. Kerosene oil and diesel oil and residual oil c. Gas oil d. Natural gas and liquid petroleum fuel
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2) The heating value of gaseous fuels is about a. 500 kJ/litre b. 30 kJ/litre c. 100 kJ/litre d. 10 kJ/litre
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3) The compressor has to be started a. Before starting the gas turbine. b. After starting the gas turbine. c. Simultaneously with starting of gas turbine. d. At any time during the operation.
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4) What would be the temperature of the gas in the combustion chamber? a. 500 ° b. 1600 ° c. 1200 ° d. 650 °
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5) The efficiency of the open cycle gas plant is quite low. Why? a. Gas gets cooled before reaching the turbine wheels. b. A lot of mechanical energy is used up by the compressor. c. Both (a) and (b). d. None of these
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6) Which among these are used to improve the efficiency of gas turbines? a. Regenerator. b. Inter cooling. c. Reheating. d. All of these
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7) What is regeneration? a. Removal of heat from compressed air between stages of compression. b. Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber. c. To increase the temperature of partially expanded gases by burning more fuel. d. None of these
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8) What is meant by inter cooling? a. Removal of heat from compressed air between stages of compression. b. Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber. c. To increase the temperature of partially expanded gases by burning more fuel. d. None of the above
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9) Which material is used for the manufacture of the turbine blades? a. Stainless steel b. Carbon steel c. High nickel alloy d. High alloy steel
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10) Which among these plants are most efficient? a. Open cycle b. Combined cycle c. Closed cycle d. None of these
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11) In a 2 stroke engine, the operation cycle are completed in how many strokes and revolution? a. 4 strokes and 2 revolutions b. 2 stroke and 2 revolutions c. 2 strokes and 1 revolution d. 4 stroke and 4 revolutions
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12) The speed of the diesel engine may vary from a. 0 – 100 rpm b. 200 – 1000 rpm c. 500 -5000 rpm d. 1000 – 3000 rpm
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13) The diesel plants are mainly used ________. a. as peak load plants. b. as base load plants. c. as standby power plants. d. both peak and stand by plants.
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14) What is the ranging capacity of the diesel plant? a. 50 – 750 kW b. 100 – 1175 kW c. 75 – 3750 kW d. 150 – 4575 kW
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15) It is very much necessary to treat the makeup water to remove the scale forming the impurities. Which treatment is used? a. Zeolite softener b. Lime or lime soda treatment c. Both (a) and (b) d. None of the above
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16) Which among the following instruments are provided on the exhaust line to reduce the pressure? a. Ducts b. Muffler c. Strainers d. Purifiers
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17) Which type of cylinder configuration is commonly used? a. Vertical – in line b. V – type c. Horizontal type d. All of these
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18) What is supercharging? a. Pumping of air into the cylinder at the pressure greater than atmospheric pressure. b. Pumping of air out of the cylinder at the pressure greater than atmospheric pressure. c. Pumping of air into the cylinder at the pressure lower than atmospheric pressure. d. Pumping of air out of the cylinder at the pressure lower than atmospheric pressure.
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19) Calculate the overall efficiency of the diesel plant if the fuel consumption is 0.24 kg per kWh and the calorific value of the fuel being 10000 kcal/kg. a. 30.78 b. 35.83 c. 28.73 d. 36.86
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20) The lubrication cost in a diesel power plant is _______. a. High b. Low c. Moderate d. Very low
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