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