Emerging Trends in Mechanical Engineering

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2.2 Introduction to ultra-supercritical boiler

1   A supercritical boiler is one that operates above the pressure and temperature of following values
    (A)   100 kg/cm² and 540°C
    (B)   1 kg/cm² and 100°C
    (C)   218 kg/cm² abs and 373°C
    (D)   218 kg/cm² abs and 540°C

2   Steam is generated in a _____ boiler at a pressure above the critical point.
    (A)   Simple
    (B)   Once through
    (C)   Superficial
    (D)   Thrice through

3   Apart from feed heating, what should a plant have to obtain a gain in thermal efficiency?
    (A)   Lubrication
    (B)   Differential heating
    (C)   Reheating cycles
    (D)   Regenerative cycles

4   What is the critical point of steam generation in a “once through” boiler?
    (A)   221.5 bar
    (B)   221.4 bar
    (C)   221.3 bar
    (D)   221.2 bar

5   In a typical layout of a 215MW reheat power plant, the feed in the boiler is at?
    (A)   280 degree Centigrade
    (B)   230 degree Centigrade
    (C)   238 degree Centigrade
    (D)   250 degree Centigrade

6   The input to the low pressure feed water heater is from?
    (A)   Drain heater
    (B)   Drain cooler
    (C)   Drain pipe

7   In which year was Benson boiler was invented?
    (A)   1918
    (B)   1920
    (C)   1921
    (D)   1922

8   What type of boiler is a Benson boiler?
    (A)   Super critical boiler
    (B)   Fire tube boiler
    (C)   Natural circulation boiler
    (D)   Over-through boiler

9   What is the capacity of Benson boiler?
    (A)   180 tonnes/hr & above
    (B)   150 tonnes/hr & above
    (C)   250 tonnes/hr & above
    (D)   300 tonnes/hr & above

10   What is the major disadvantage of the Benson boilers?
    (A)   Boiler is big in size
    (B)   Has large storage capacity
    (C)   Deposition of salts
    (D)   Bubble formation

11   The increment in thermal efficiency compared to the corresponding Subcritical cycle is gained at the expanse of?
    (A)   compactness of the plant
    (B)   simplicity of the plant
    (C)   complexity of the plant
    (D)   expanse of the plant

12   The input to the low pressure feed water heater is from?
    (A)   Drain heater
    (B)   Drain cooler
    (C)   Drain pipe
    (D)   None of the mentioned

13   Supercritical boiler generate___ to ___pressure.
    (A)   22Mpa to 25Mpa
    (B)   28Mpa to 20Mpa
    (C)   23Mpa to 27Mpa
    (D)   25Mpa to 28Mpa

14   Supercritical boilers are use for…………..
    (A)   Thermal power.
    (B)   Electric power
    (C)   Solar power.
    (D)   Steam power

15   Which type of boiler is used critical pressure………..
    (A)   Benson boiler.
    (B)   Water tube boiler.
    (C)   Fire tube.
    (D)   Steam boiler

16   Who has patent design for boiler?
    (A)   Mark Benson.
    (B)   Mark Zuckerberg
    (C)   Newton.
    (D)   C.N. Rao

17   Which of the following needs to be incorporated to prevent the low pressure turbine exhaust wetness from being excessive?
    (A)   Double regeneration
    (B)   Double carbonization
    (C)   Double reheat
    (D)   Double cooling

18   An ultra-super critical boiler operates at……
    (A)   Ultra-Supercritical pressure
    (B)   Thermal pressure
    (C)   Critical pressure
    (D)   Atmospheric pressure

19   ________ terms are used to describe supercritical and ultra-supercritical coal generation by the coal industry.
    (A)   High- efficiency and low -emissions
    (B)   Low-efficiency and high- emissions
    (C)   High-efficiency and high- emissions
    (D)   Low-efficiency and low-emissions

20   In 1922, _____ was granted a patent for a boiler designed to convert at high pressure.
    (A)   Mark Benson
    (B)   James Watt
    (C)   Alexander Graham Bell
    (D)   Archimedes

21   What was the main concern behind Benson’s concept?
    (A)   Safety
    (B)   power generation
    (C)   conversation of energy
    (D)   All of the above

22   The subcritical temperature is ——–
    (A)   Up to 809 F and 221.2 bar
    (B)   Up to 705 F and 222. 2 bar
    (C)   Up to 900 F and 344.3 bar
    (D)   Up to 605 F and 216.3 bar

23   Ultra-supercritical temperature is _____.
    (A)   1,400 °F
    (B)   2,000 °F
    (C)   1,600°F
    (D)   1,800°F

24   Which of these is not a type of steam generator depending upon the kind of applications?
    (A)   utility steam generators
    (B)   marine steam generators
    (C)   agricultural steam generators
    (D)   industrial steam generators

25   The subcritical steam generators operate between a pressure ranges of?
    (A)   120-160 bar
    (B)   100-110 bar
    (C)   130-180 bar
    (D)   140- 200 bar

26   Industrial steam generators operate at a steam capacity of?
    (A)   1300 kg/s
    (B)   1000 kg/s
    (C)   500 kg/s
    (D)   125 kg/s

27   Ultra-super critical boiler uses steam with very high temperature up to ……
    (A)   980°
    (B)   620°
    (C)   550°
    (D)   720°

28   An ultra-super critical boiler generates less emission per……of power output.
    (A)   Kilowatt
    (B)   Watt
    (C)   Megawatt
    (D)   Metric horse power

29   An ultra-super critical boiler was developed in the US in …….
    (A)   1950s
    (B)   1970s
    (C)   1960s
    (D)   1940s

30   Philo unit 6 in Ohio was built by …….
    (A)   Thomas Savery
    (B)   Denis Papin
    (C)   Thomas Edison
    (D)   Babcock and Wilcox

31   If ……. has a future, then ultra-super critical boiler will be the key.
    (A)   Coal
    (B)   Fossil fuels
    (C)   Natural gas
    (D)   Oil

32   An ultra-super critical boiler technology is today the Option: of choice for most new……. fired power stations.
    (A)   Coal
    (B)   Natural gas
    (C)   Biogas
    (D)   Oil

33   In ultra-super critical boiler technology the units run at about ……. efficiency.
    (A)   40%
    (B)   50%
    (C)   55%
    (D)   45%

34   Yuhuan has ……. first 1000MW ultra-super critical pressure boiler.
    (A)   America
    (B)   China
    (C)   India
    (D)   Russia

35   Which type of generator is a type of boiler that at maximum critical pressure frequently used in the production of electric power?
    (A)   Supercritical boiler
    (B)   High pressure boiler
    (C)   Low pressure boiler
    (D)   None

36   Ultra supercritical boilers are mostly used in ______.
    (A)   Petrochemical industries
    (B)   Coal industries
    (C)   Textile industries
    (D)   none

37   Supercritical is ___% efficient than subcritical boiler.
    (A)   42-47
    (B)   50-55
    (C)   32-38
    (D)   More than 60

38   Find false statement
    (A)   Tube of supercritical boilers are self-supporting
    (B)   Corners are easy to form
    (C)   Uniform heating of water takes place in supercritical boiler occurs
    (D)   All

39   State disadvantage of Supercritical boiler.
    (A)   Corrosion problem
    (B)   Setting of material in feed lines can produce explosions
    (C)   Leakage problem
    (D)   All

40   What type of boiler is supercritical boiler
    (A)   Drum type
    (B)   Once through type
    (C)   Both
    (D)   None

41   A ultra-supercritical steam generator operates at pressures above the critical pressure
    (A)   2400 psi
    (B)   1500 psi
    (C)   3200 psi
    (D)   4600 psi

42   The point of ultra-supercritical steam generator is to save on coal to heat the water and reduce ________ emissions.
    (A)   Oxygen (O2)
    (B)   Water (H2O)
    (C)   Carbon dioxide (CO2)
    (D)   Both ‘a’ and ‘c’

43   Because less coal is consumed in this system, emissions of ______ and particulate and solid waste by products are reduced.
    (A)   Sulphur dioxide (SO2)
    (B)   Nitrogen oxide (NOx)
    (C)   Carbon dioxide (CO2)
    (D)   All of the above.

44   Higher plant efficiency up to______ over the entire load range.
    (A)   30%-50%
    (B)   20%-40%
    (C)   60%-90%
    (D)   50%-80%

45   The world’s first boiler using supercritical technology was introduced by “B&W” in ______
    (A)   1948
    (B)   1936
    (C)   1928
    (D)   1957

46   The thermal efficiency of a Watt’s Beam Engine is about?
    (A)   50%
    (B)   100%
    (C)   5%
    (D)   2%

47   Among which locomotive steam engines have the highest efficiency?
    (A)   1 MW
    (B)   2 MW
    (C)   30 MW
    (D)   660 MW

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