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THERMAL POWER PLANT Online Test and Answers Pdf Download :-
These are very useful & Most Asked Questions in your certification Exam. Read all Online Mock Test Exam Question Bank for Beginners Freshers & Experienced.
1. in steam power plant which of the following component needs more maintenance:
a) Condenser
b) Boiler
c) Turbine
d) Coal carrying system
Answer: b
2. 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: d
3. For the flue gas flow, tick the correct sequence:
a) Boiler-Air preheater- economizer- ID fan- Chimney
b) Boiler- ID fan -Air preheater- Economizer- Chimney
c) Boiler- Economizer- Air preheater- ID fan- Chimney
d) None of the above
Answer: c
4. Hydrogen cooling employed in large thermal power plant alternator:
a) Increases the insulation life
b) Decreases the insulation life
c) Does not affect the insulation life
d) None of the above
Answer: a
5. Hydrogen cooling is employed in:
a) Turbo Generators only
b) Water wheel Generators only
c) Can b used in both turbo generators and water wheel generators
d) None of the above
Answer: a
6. The efficiency of the electro static precipitators will be of the order:
a) 99.6%
b) 90%
c) 85%
d) 80%
Answer: a
7. Economizer is normally employed when boiler pressure exceeds:
a) 70 kg/cm2
b) 50 kg/cm2
c) 30 kg/cm2
d) Can be used for all pressures
Answer: a
8. The sizing of the generator in power plant is based on:
a) Current carrying capacity ratings only
b Insulation strength ratings only
c) Both (a) and (b)
d) None of the above
Answer: c
9. Without Electro static precipitators:
a) ID fan rating should be increased
b) Economizer rating should be increased
c) Chimney height should be reduced
d) None of the above
Answer: a
10. In thermal power plants the condenser used is of:
a) Surface type
b) Jet type
c) Can be both surface type and jet type
d) None of the above
Answer: a
11. Coal rank classifies coal as per its:
a) Specific gravity
b) Degree of metamorphism
c) Carbon percentage
d) Ash content
Answer: d
12. Induced draft fans are used to:
a) Cool the steam let out by the turbine in the thermal power station
b) Cool the hot gases coming out of boiler
c) Forces the air inside the coal furnace
d) Pull the gases out of furnace
Answer: d
13. Generally the speed of turbine generators employed in thermal power plants will be in the range of:
a) 750 rpm
b) 1000 rpm
c) 3000 rpm
d) 5000 rpm
Answer: c
14. Large size thermal power plants will be:
a) peak load plants
b) Base load plants
c) Can be operate either as peak load or base load plants
d) None of the above
Answer: b
15. The auxiliary consumption of thermal power plants will be in the range:
a) 2-5% of plant power generated
b) 8-10% of power generated
c) 15-20% of power generated
d) 20-25% of power generated
Answer: b
16. Which of the following equipment is installed in steam power plant to reduce air pollution:
a) Air filer
b) HEPA filter
c) Electro static precipitator
d) All the above can be used
Answer: c
17. Burning of low grade coal can be improved by:
a) Pulverizing the coal
b) Blending with high quality coal
c) Oil assisted ignition
d) All the above
Answer: b
18. Equipment used for pulverizing the coal is:
a) hopper
b) Stoker
c) Ball mill
d) Electro static precipitator
Answer: c
19. The percentage of carbon in anthracite is usually:
a) More than 90%
b) About 70%
c) About 50%
d) Below 40%
Answer: a
20. for the same power the size of the turbine:
a) Increases with speed
b) Decreases with speed
c) Constant irrespective of speed
d) None of the above
Answer: b
THERMAL POWER PLANT Objective type Questions with Answers
21. Which type of coal has lowest calorific value?
a) Peat
b) Lignite
c) Bituminous
d) Anthracite
Answer:b
22. Pipes carrying steam in thermal power plant are generally made of:
a) Steel
b) Cast iron
c) aluminium
d) Cobalt
Answer: a
23. Economizer of boiler has main function of:
a) Heat up the incoming water with excess steam
b) Heat up the pulverized fuel by exhaust gases
c) Heat up the incoming air by exhaust gases
d) Heat up the incoming water by exhaust gases
Answer: d
24. In a super heater:
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: c
25. Steam turbine works on the principle of:
a) carnot cycle
b) brayton cycle
c) rankine cycle
d) None of the above
Answer: c
26. The steam power plant efficiency can be improved by:
a) Using large quantity of water
b) Burning large quantity of coal
c) Using high temperature and pressure of steam
d) Decreasing the load on the plant
Answer: c
27. As the size of the thermal power plant increases, the capital cost per kW of installed capacity:
a) Increases
b) Decreases
c) Remains the same
d) May increase and decrease
Answer: b
28. Vacuum can be measured by using:
a) rotameter
b) pitot tube
c) U tube manometer
d) ventrimeter
Answer: b
29. Electrostatic precipitator is installed between:
a) Induced fan and chimney
b) air preheater and induced fan
c) Economizer and air preheater
d) Boiler furnace and economiser
Answer: b
30. Belt conveyors can be employed for transporting coal at inclination up to:
a) 75 deg
b) 60 deg
c) 30 deg
d) 15 deg
Answer: c
31. In a shell and tube surface condenser:
a) Steam passes through the tubes and cooling water surrounds them
b) Cooling water passes through the tubes and steam surrounds them
c) Steam and water mix to give condensate
d) None of the above
Answer: b
32. The purpose of Spray pond in Thermal power plant is:
a) To deposit the ash coming out of the thermal power plant
b) To cool the water coming out of condensate
c) To remove the dissolved gases in the feed water
d) None of the above
Answer: b
33. For the forced draft the blower is located:
a) At the top of the chimney
b) Near the base of the chimney
c) Near the base of the boiler
d) None of the above
Answer: c
34. It is important the heat the water before feeding to boiler because:
a) The dissolved gases which corrodes the boiler are removed
b) Thermal stresses arises due to the cold water entering the boiler can be reduced
c) Some impurities carried by steam and condensate due to corrosion in boiler and condenser are precipitated outside the boiler
d) All the above
Answer: d
35. Which type of alternator is employed in thermal power plant?
a) Salient type
b) Non salient pole type
c) Both can be used
d) None of the above
Answer: b
36. The indication to determine the incomplete combustion is:
a) High percentage of carbon dioxide content in the flue gases
b) High percentage of CO content in the flue gases
c) High temperature of the flue gases
d) All the above
Answer: b
37. For the same drought required, the power of forced draught fan will be __ than the induced draught fan:
a) Higher
b) Lower
c) The same
d) May be more or less
Answer: b
38. What are the combustible elements in the fuel:
a) Carbon and hydrogen
b) Carbon, hydrogen and ash
c) Carbon, hydrogen and sulphur
d) None of the above
Answer: c
39. The efficiency of the thermal power plant is of the order:
a) 15%
b) 30%
c) 50%
d) 60%
Answer: b
40. The coal which has highest ash content is:
a) Lignite
b) Coke
c) Bituminous coal
d) Peat
Answer: a