DCS in Thermal Power Plant Multiple Choice Questions and Answers 1. DCS in Thermal power An automated power plant uses a) Programmable Logic Controller (PLC) b) Distributed control system (DCS) c) PLC or DCS d) none of the mentioned Answer: PLC or DCS 2. Supervisory Control And Data Acquisition (SCADA) system in a power plant monitors and controls a) Temperatures, speeds of pumps and motors b) Open and close valves. c) Both (a) & (b) d) none of the mentioned Answer: Both (a) & (b) 3. A _________ is the heart of a thermal power plant's instrumentation and control systems.  a) Distributed control system b) Discontinuous controller c) Continuous Controller d) none of the mentioned Answer: Distributed control system 4. The common communication protocols used in DCS include a) Ethernet b) HMI c) Device Net d) Control net Answer: HMI 5. When exchanging digital signals between two different control system then (e.g. DCS DO is connected to PLC DI) a) PLC Side input shall be poten

  Hydraulic Speed Responsive Governor Multiple Choice Questions And Answers 1. In hydraulic governors speed measuring device is connected to ________ a) Piston b) Power shaft c) Pilot valve d) None of the mentioned Answer: Pilot valve 2. Hydraulic governors have ________ adjustability to control. a) rich b) poor c) medium d) none of the mentioned Answer: poor 3. For sliding of pilot valve it requires ______ force and it is generated from piston. a) large b) small c) medium d) none of the mentioned Answer: small 4. _____________ is the standard hydraulic governor used in prime movers. a) Dash type isochronous governor b) Drop governor c) Dash type isochronous & Drop governor d) None of the mentioned Answer: Dash type isochronous governor 5. Hydraulic governors are ________ sensitive when compared to mechanical governors. a) less b) more c) equal d) none of the mentioned Answer: more 6. Dash type isochronous governor gives _________________ control. a) Proportional b) Integrational c

Power Plant Turbine Objectives Questions And Answers Gas Turbine-Steam Power Plant Multiple Choice Questions And Answers 1. What part or % of power developed is utilised for driving the compressor? a) 65 % b) 70 % c) 55 % d) 80 % Answer: 65 % 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 Answer: 30 kJ/litre 3. In the ____________ heat transfer takes place between the exhaust gases and cool air. a) Intercooler b) Re-heater c) Regenerator d) Compressor Answer: Regenerator 4. The efficiency of multistage compressor is _____ than a single stage. a) lower b) higher c) equal to d) all of the mentioned Answer: lower 5. 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 Answer: Before starting the gas turbine 6. Gas turbine is shut down by ____________ a) Turning off start

    Difference between HCV and LCV     HCV LCV Also known as higher heating value (HHV) or gross calorific value Also known as lower heating value (LHV) or net calorific value Byproducts are allowed to condense Byproducts are allowed to escape Amount of heat evolved when a unit weight (or volume in the case of gaseous fuels) of the fuel is completely burnt and the products of combustion cooled to the normal conditions (with water vapor condened as a result). Amount of heat evolved when a unit weight (or volume in the case of gaseous fuels) of the fuel is completely burnt and water vapor leaves with the combustion products without being condensed. Total energy released when products have cooled down to the room temperature and water has been condensed out. Energy released when products are hot. Some of the heat or energy in byproducts can be recovered through condensation. Heat or e

  Heat of Combustion Objectives Types Questions and Answers    1. What is the heating value of 10 Kg of coal with heat of combustion 10 J/Kg? a) -10 J b) 10 J c) -100 J d) 100 J Answer: -100 J 2. What is the difference between lower heating value and higher heating value if the product has 2 moles of H2O and Enthalpy of vaporization is 40 J/mole at standard conditions? a) -40 J b) 40 J c) -80 J d) 80 J Answer: -80 J 3. What is the heating value of 2 Kg of coal with heat of combustion 15 J/Kg? a) -15 J b) 15 J c) -30 J d) 30 J Answer: -30 J 4. What is the heat of reaction for N2 + 3H2 -> 2NH3, if the heat of combustion of N2 = 5 J, H2 = 2 J, and NH3 = 15 J? a) -5 J b) 5 J c) -19 J d) 19 J Answer: -19 J 5. What is the heat of reaction if the heat of combustion of products is 40 J and heat of combustion of reactants is 25 J? a) 5 J b) 10 J c) 15 J d) -15 J Answer: -15 J 6. What is the heat of reaction if the heat of combustion of products is 25 J and heat of combustion of reactants is

Heat of Combustion Multiple Choice Questions and Answers 1. Flue gas discharge velocity through chimney of a big thermal power plant may be around __________ m/sec. a) 0.5 b) 500 c) 10 d) 50 Answer: 10 2. Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively __________ percent. a) 10 & 3 b) 3 & 10 c) 15 & 8 d) 10 & 20 Answer: 10 & 3 3. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg. a) 1000 b) 4000 c) 6000 d) 8000 Answer: 4000 4. If the enthalpy change for a reaction is zero, ΔG° is equal to _____________ a) TΔS° b) -TΔS° c) -ΔH° d) lnKeq Answer: -TΔS° 5. The heat transferred when the H2O in the products is in the vapour state is called? a) HCV b) LCV c) HHV d) None of the mentioned Answer: LCV 6. The heat transferred when the H2O in the products is in the liquid state is called? a) HCV b) LCV c) LHV d) None of the mentioned Answer: HCV 7. HCV stands f

  Power plant Multiple Choice Questions and Answers Superheaters and Reheaters Control Multiple Choice Questions and Answers 1. Lancashire boiler has _____ internal flue tubes. a) 1 b) 3 c) 2 d) 4 Answer: 2 2. The number of fire tubes in a Cochran boiler are ___________ a) 75 b) 165 c) 225 d) 175 Answer: 165 3. The diameter of a cylindrical shell of a Scotch marine boiler varies from ___________ a) 3.5 to 4.5m b) 1.5 to 2m c) 2.5 to 3.5m d) none of the mentioned Answer: 2.5 to 3.5m 4. An economiser is installed in a boiler primarily to ___________ a) increase steam pressure b) reduce fuel consumption c) superheat the steam d) all of the mentioned Answer: reduce fuel consumption 5. Which of the following is a water tube boiler? a) Lancashire boiler b) Cochran boiler c) Babcock & Wilcox boiler d) Locomotive boiler Answer: Babcock & Wilcox boiler 6. The theoretical indicator diagram of a simple steam engine is based upon the assumption that ___________ a) there is no pressure drop

  Feedwater Control Multiple Choice Questions and Answers 1. Thermal treatment methods used to remove impurities like: a) Dissolved carbon dioxide and other gases b) Solid materials c) Carbonate d) Bacterial impurities Answer: Dissolved carbon dioxide and other gases 2. Boiler modulating feedwater control flow rate depends on a) level set point b) control valve position c) actual level d) set point, level, and valve position Answer: set point, level, and valve position 3. Feed water for boiler of thermal power plant is obtained from: a) Natural sources like river and lake b) Partly from condensed steam and natural sources c) Condensed steam and small percentage from natural resources d) Natural sources and small percentage from condensed steam Answer: Condensed steam and small percentage from natural resources 4. Which method is used in large modern thermal power plants to heat feed water? a) Open type heatre is used b) Close type heater is used c) Steam is directly taken from main tur

Coal Mill Objective Questions and Answers Coal Mill or Pulverised mill MCQ 1. What is the pulverization capacity of the ball mill? a) 10 tons of coal per hour b) 20 tons of coal per hour c) 50 tons of coal per hour d) 80 tons of coal per hour Answer: 10 tons of coal per hour 2. What is done when there is requirement for more coal in the ball and race mill? a) The primary air flow is increased b) The combustion intensity is reduced c) The secondary air flow sucks out the light coal particles d) The hopper is fully opened Answer: The primary air flow is increased 3. On what basis is selection of bowl mill is not done? a) Total moisture content of coal b) Volatile matter c) Ash producing capacity d) Grindability Answer: Ash producing capacity 4. What is the purpose of rotary scoop shaped rejecter arms in impact mill? a) To send back the coal back into grinder for second run b) To throw the large particles back into the grinder c) To eliminate ash from the pulverizer d) To eliminate rocks

Coal Handling and ASH Handling Multiple Choice Questions and Answers Cool and Ash Handling System MCQ 1. When coal is being burnt how much % of ash is formed compared to the whole amount? a) 10-20% b) 40-50% c) 25-35% d) 4-10% Answer: 10-20% 2. The coal is fed to the furnace through _________ a) conveyor belt b) wagon tipper c) hopper d) crane Answer: hopper 3. Why is it important to prefer ash handling systems? a) Coal ash produced destroys the machinery by entering into them b) Coal ash produced annually accounts for thousands of tones c) Coal ash can be reutilized for some other purpose d) Coal ash affects the health of people working at plants Answer: Coal ash produced annually accounts for thousands of tones 4. What is the role of breaker house in coal feeding? a) To break the coal into smaller pieces b) To separate different sizes of coal c) To separate the light dust from the coal d) To powder the coal Answer: To separate the light dust from the coal 5. Large amount of coal is t

  Condensers and Cooling Towers Multiple Choice Questions with Answers Condensers Multiple Choice Questions 1. The function of a condenser in a thermal power plant is__________. a) to act as a reservoir to receive steam for the turbine b) to condense steam into condensate to be reused again c) to create a vacuum d) all of these Answer: all of these 2. A condenser condenses the steam coming out from___________. a) Boiler b) Turbine c) Economiser d) Super heater. Answer: Turbine 3. Spray ponds are used to cool the warm water coming from the condenser in ________ a) Large power plants b) Small power plants c)  Medium power plants d) Both medium and large power plants. Answer: Small power plants 4. Water used in the steam plant is used for cooling in_______________. a) Condenser b) Turbine only c) Boiler tube d) Boiler tubes and turbines Answer: Condenser 5. What is use of the air pumps in the condenser? a) Remove water b) Air leaking in the condenser and to maintain the vacuum. c) Maintai