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This set of Power Plant Engineering PPE Multiple Choice Questions & Answers (MCQs) focuses on Power Plant Engineering Set 9
Q1 | Which of these is not a type of drive of variable speed control?
- variable speed turbine
- hydraulic coupling
- multiple speed ac motor
- electronically adjustable turbine drive
Q2 | Which of the following is not a reason of heating feed water?
- it improves overall efficiency
- it removes dissolved impurities
- it prevents from thermal stress which may cause due to enter of cold water into boiler
- it produces steam from feed water
Q3 | Feed water for boiler of thermal power plant is obtained from:
- natural sources like river and lake
- partly from condensed steam and natural sources
- condensed steam and small percentage from natural resources
- natural sources and small percentage from condensed steam
Q4 | Mechanical method of water treatment is done to
- heat the feed water
- to remove solid matter and impurities
- to add some solid materials
- to remove dissolved gases
Q5 | Which method is used in large modern thermal power plants to heat feed water?
- open type heatre is used
- close type heater is used
- steam is directly taken from main turbine and used to heat it feed water
- surface type heater is used
Q6 | Thermal treatment methods used to remove impurities like:
- dissolved carbon dioxide and other gases
- solid materials
- carbonate
- bacterial impurities
Q7 | Heat treatment arrangement used to separate or remove deserved gases and impurities from feed water is called the year later.
- true
- false
Q8 | Chemical method of treatment is used for treatment of:
- diissolve gases
- carbonate and carbon dioxide
- bacterial impurities
- send and suspended materials
Q9 | Having two separate units for process heat and power is?
- useful
- useless
- pollution reducing
- none of the mentioned
Q10 | A plant producing both, electrical power & process heat simultaneously is?
- cogenital plant
- cogenerial plant
- cogeneration plant
- conglomerate plant
Q11 | In a back pressure turbine
- pressure at the exhaust from the turbine is the saturation pressure corresponding to the temperature desired in the process
- pressure at the entrance of the turbine is the saturation pressure corresponding to the temperature desired in the process
- pressure at the exhaust from the turbine is the saturation pressure corresponding to the pressure desired in the process
- none of the mentioned
Q12 | In a by-product power cycle?
- the power is produced initially
- power production is in the middle stages of the cycle
- power production is after the cycle has ended
- none of the mentioned
Q13 | In terms of cost per MW compared to condensing sets of the same power, the back pressure turbines are?
- more expensive
- cheaper
- costly
- none of the mentioned
Q14 | Which of the following is a good medium for constant temperature heating?
- water
- steam
- coolant
- diesel
Q15 | The cogeneration plant efficiency nCO if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by?
- nco = (wt + qi) / qh
- nco = (wt – qi) / qh
- nco = (wt + qh) / qi
Q16 | If e is the electricity fraction of the total energy output, m is the electric plant efficiency and n is the steam generator efficiency; the heat added per unit total energy output is given by?
- (1 / m) + ((1 – e) / n)
- (1 / n) + ((1 – e) / m)
- (1 / m) + ((1 + e) / n)
- (1 / n) + ((1 – e) / m)
Q17 | Pass-out turbines are used in which of these cases?
- relatively high back pressure
- small heating requirement
- only relatively low back pressure
- both relatively high back pressure and small heating requirement
Q18 | Which of these is not considered economical for cogeneration?
- a high fraction of electric to total energy
- a low fraction of electric to total energy
- a low fraction of total energy to electric energy
- none of the mentioned
Q19 | Which of these is a working fluid in the topping plant of a Brayton-Rankine combined plant?
- hydrogen
- helium
- nitrogen
- all of the mentioned
Q20 | Which of these is a working fluid in the bottoming plant of a Brayton-Rankine combined plant?
- mercury
- steam
- water
- air
Q21 | What would be the temperature of the gas in the combustion chamber?
- 500 °c
- 1600 °c
- 1200 °c
- 650 °c
Q22 | To improve the efficiency of the gas turbines, which among these are used?
- regenerator
- inter cooling
- reheating
- all of the mentioned
Q23 | What is regeneration?
- removal of heat from compressed air between stages of compression
- transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber
- to increase the temperature of partially expanded gases by burning more fuel
- transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber and increases the temperature of partially expanded gases by burning more fuel
Q24 | What is meant by inter cooling?
- removal of heat from compressed air between stages of compression
- transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber
- to increase the temperature of partially expanded gases by burning more fuel
- none of the mentioned
Q25 | Which material is used for the manufacture of the turbine blades?
- stainless steel
- carbon steel
- high nickel alloy
- high alloy steel