Thermal power plants And Steam Power plant MCQs with Answers
Thermal power plants And Steam Power plant MCQs with Answers
Steam Power plant Objective Questions and Answers
1. The thermal efficiency of a steam power station is __________
a) 38%
b) 28%
c) 40%
d) 45%
Answer: 28%
2. In the steam condensing power plants
a) The amount of energy extracted per kg of steam is increased
b) the steam, converted into water, can be re-circulated with the help of pump
c) Both (a) and (b)
d) None of the above
Answer: Both (a) and (b)
3. Rankine cycle efficiency in a good steam power station may be in the range between __________
a) 15% - 20%
b) 35% - 40%
c) 50% - 60%
d) 90% - 95%
Answer: 35% - 40%
4. A steam power station requires space __________
a) Equal to diesel power station
b) More than diesel power station
c) More than diesel power station
d) None of the above
Answer: More than diesel power station
Design of Solar Thermal Power Plants5. The height of chimney in a staem power plant is governed by __________
a) Flue gases quantity
b) The draught to be produced
c) Control of pollution
d) Corner of power plant
Answer: The draught to be produced
6. The major heat loss in a steam power station occurs in __________
a) Heat chember
b) Penstock
c) Spillways
d) Condenser
Answer: Condenser
7. The major heat loss in a steam power station occurs in __________
a) Economiser
b) Spillways
c) Condenser
d) None of the above
Answer: Condenser
8. The cost of fuel transportation is maxmimun in __________
a) Hydro-electric power plant
b) Steam power plant
c) Nuclear power plant
d) 90% - 95%
Answer: Steam power plant
9. Modern steam plants works on which of the following cycles?
a) Carnot cycle
b) Rankine cycle
c) Otto cycle
d) Bell- Coleman cycle
Answer: Rankine cycle
10. Space required of a steam power station __________
a) More than diesel power station
b) Equal to diesel power station
c) Less than diesel power station
d) None of the above
Answer: More than diesel power station
Thermal power plants Objective Questions and Answers
1. What would be the most important factor under consideration for the site selection of a thermal plant?
a) Availability of fuel.
b) Availability of water.
c) Distance from the populated area.
d) Cost and the type of land.
Answer: Availability of water
2. Which of the following station is least efficient __________
a) Nuclear power plant
b) Diesel power station
c) Thermal power station
d) None of the above
Answer: Thermal power station
3. __________ requires more space
a) Nuclear power plant
b) Hydro-electric power plant
c) Tharmal power plant
d) Diesel power plant
Answer: Tharmal power plant
4. Standby loss is maximum in __________
a) Nuclear power plant
b) Hydro-electric power plant
c) Tharmal power plant
d) Diesel power plant
Answer: Tharmal power plant
5. In thermal power plant, turbine is placed
a) before boiler
b) in between boiler and generator
c) after generator
d) any of the above
Answer: in between boiler and generator
6. The following is the correct order of energy conversion in thermal power plants
a) Chemical energy – Mechanical energy – Electrical energy
b) Mechanical energy – Chemical energy – Electrical energy
c) Wind energy – Mechanical energy – Electrical energy
d) Heat energy – Electrical energy – Mechanical energy
Answer: Chemical energy – Mechanical energy – Electrical energy
7. The most common methods used for burning of coal is _______
a) Stroker firing
b) Pulverized fuel firing
c) both (a) and (b)
d) None of the above
Answer: both (a) and (b)
8. A ‘stroker’ is a power operated fuel ___ mechanism
a) Burning
b) Feeding
c) Handling
d) Storage
Answer: Feeding
9. The spreader stroker, secondary air is supplied
a) through holes
b) through nozzles
c) from bottom side
d) any of the above
Answer: through nozzles
10. The following is not a pulverized fuel burner.
a) Tangential burner
b) Turbulent burner
c) Cyclone burner
d) Radial burner
Answer: Radial burner
11. In which of the following type of burner, liquid fuel is raised by capillary action?
a) Wick burners
b) Re-circulating burner
c) Rotating cup burner
d) All of the above
Answer: Wick burners
12. A Fluidised bed may be defined as the bed of ______ particles
a) Liquid
b) Solid
c) Both (a) and (b)
d) None of the above
Answer: Solid
13. The following is are ash handling systems
a) Hydraulic system
b) Pneumatic system
c) Steam jet system
d) All of the above
Answer: All of the above
14. The following is dry type dust collectors
a) Spray type
b) Packed type
c) Impingement type
d) cyclone separator
Answer: cyclone separator
15. The major constituent of fly ash is
a) Silicon dioxide
b) Aluminium oxide
c) Calcium oxide
d) Magnesium oxide
Answer: Silicon dioxide
16. The draught produced by the chimney if due to the ____ difference between the column of hot gases inside the chimney and the cold air outside.
a) Temperature
b) Potential
c) Density
d) None of the above
Answer: Density
Economiser in Thermal Power Plant Objective Questions and Answers
1. The feed water entering into a Economiser in a thermal plant gets heated up by____________.
a) H.P cycle
b) Flue gases
c) L.P cycle
d) Direct heat from the furnace
Answer: Flue gases
2. The major use of the Economiser is ___________.
a) Heat up the incoming water with exhaust steam.
b) Heat up the pulverised fuel by exhaust.
c) Heat up the incoming air by exhaust gases.
d) Heat up the incoming water by exhaust gases.
Answer: Heat up the incoming water by exhaust gases.
3. Economiser is used to heat ___________.
a) Feed heater
b) Air
c) Flue gases
d) All of the above
Answer: Feed water
4. Economoser improves boiler efficiency ___________.
a) 4% to 5%
b) 1% to 5%
c) 10% to 12%
d) 18% to 20%
Answer: 4% to 5%
Flue Gases and Super Heater in Thermal Power Plant Objective Questions and Answers
1. The flue gases are released to the atmosphere through _____________.
a) Air- Preheater
b) Forced draught
c) Induced draught
d) Electrostatic precipitator
Answer: Electrostatic precipitator
2. The path of flue gases in Thermal power plant is
a) Boiler – Economizer – Superheater– Air preheater
b) Boiler – Superheater – Air preheater – Economizer
c) Boiler – Air preheater – Superheater – Economizer
d) Boiler – Superheater – Economizer – Air preheater
Answer: Boiler – Superheater – Economizer – Air preheater
3. In thermal power plants, the dust of flue gases is trapped by
a) Precipitator
b) Economizer
c) Superheater
d) Air preheater
Answer: Precipitator
4. Fluid fuels are handled by
a) burners
b) stokers
c) both (a) and (b)
d) None of the above
Answer: both (a) and (b)
5. In a superheater _____________.
a) Pressure rises and temperature drops.
b) Temperature rises and pressure drops.
c) Temperature rises and pressure remains unchanged.
d) Pressure rises and temperature remains the same.
Answer: Temperature rises and pressure remains unchanged.
6. Equipment installed in the steam plants to reduce the rate of air pollution is________________.
a) De super heater
b)Air filter
c) Air electrostatic precipitator
d) Stock
Answer: Air electrostatic precipitator
Boiler in Thermal Power Plant Objective Questions and Answers
1. The boiler commonly used in a thermal plant are__________________.
a) Water tube type
b) Fire tube
c) Both (a) & (b)
d) None of these
Answer: Both (a) & (b).
2. Water to the boiler is at________________
a) Atmospheric pressure
b) Slightly more than atmospheric pressure.
c) More than steam pressure in the boiler.
d) Any pressure.
Answer: More than steam pressure in the boiler.
3. What is the main advantage of the usage of high pressure boilers in a thermal plant?
a) Lower price
b) Increase in efficiency
c) Low grade fuel can be burnt.
d) Both (b) and (c)
Answer: Both (b) and (c)
4. What is the normal range of pH of water to be maintained in the steam rising in the thermal power station?
a) 3.5
b) 7.02
c) 8.5
d) 9.87
Answer: 8.5
5. Heat balance in a boiler furnace is improved by sending air to the furnace
a) At low temperature.
b) At high temperature.
c) Mixed with CO2.
d) Both (b) & (c).
Answer: At high temperature.
6. Coal is carried from storage to the boiler by means of?
a) Trolleys
b) V – belts
c) Buckets
d) Manually
Answer: Buckets
7. In reaction turbine,function of the draft tube is __________
a) To increase the flow rate
b) To reduce water hammer effect
c) To convert kinetic energy of water to potential energyby a gradual expansion in divergen part
d) None of the above
Answer: To reduce water hammer effect
8. For steam boilers, the fuels is mainly
a) Bituminous coal
b) Fuel oil
c) Natural gas
d) All of the above
Answer: All of the above
9. The draught in locomotive boilers is produced by __________
a) Forced fan
b) Chimney
c) Steam jet
d) Only locomotive motion
Answer: Steam jet
10. Francis,kaplan and propeller turbines fall under the category of __________
a) Impulse turbine
b) Reaction turbine
c) Impulse reaction combined
d) Axial flow
Answer: Reaction turbine
11. Francis turbine is usually used for __________
a) High head
b) Low head
c) Mediam head
d) All of the above
Answer: Mediam head
12. Pelton wheel turbine is used for minimum of the following heads __________
a) 20 m
b) 40 m
c) 120 m
d) 180 m and above
Answer: 180m and above
13. Pelton turbine is suitable for high head and __________
a) High discharge
b) Low discharge
c) High and low discharge
d) None of the above
Answer: Low discharge
14. Water to the boiler is at more than ________ in the boiler
a) Atmospheric pressure
b) Any pressure.
c) Steam pressure
d) All of the above
Answer: Steam pressure
15. The pH value of the water used in boiler is
a) unity
b) 7
c) slightly less than seven
d) slightly more than seven
Answer: slightly more than seven
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