Department : Kerala Cooperative Milk Marketing Federation Limited
Category Code : 07/17
Qualificatios : SSLC
Question Paper Code : 68/2017/OL
Date of Test : 08-08-2017
- Good opportunity for energy savings from continuous blow down of boiler is by
- Recovery of flash steam for use in deaerator
- Using the blowdown steam to run steam turbine
- Reusing the hot water so formed as make-up water
- None of these
- Which fuel requires the lowest amount of excess air for combustion?
- Pulverised coal
- Bagasse
- Fuel oil
- Natural gas
- Which data is not required to calculate the efficiency of boiler by indirect method?
- Flue gas temperature
- Ambient temperature
- Calorific value of fuel
- Blow down rate
- The pour point of furnace oil (in deg. C) is
- 100
- 20
- 50
- 25
- In which of the following equipment is stored heat used for preheating combustion air?
- Convective recuperator
- Radiation recuperator
- Regenerator
- Heat pump
- LPG is predominantly a mixture of propane and
- Butane
- Isopropane
- Methane
- Ethane
- The unit of specific heat is
- KCal/kg
- KCal/m3
- KCal/kg°C
- KCal
- If the pressure of saturated steam is reduced through a pressure reducing valve
- Enthalpy of evaporation will reduce
- It will get superheated
- Enthalpy will reduce
- It will produce wet steam
- Radiation losses from a boiler practically
- Increase with increase in its % loading
- Decrease with increase in its % loading
- Are independent of its % loading
- None of these
- Drain pockets are provided in a steam line for
- Effective removal of line condensate
- Effective removal of steam
- Removal of dirt
- Checking of steam line
- Flash steam can be recovered from
- Leaking steam
- Condensate at vacuum
- Condensate at high pressure
- Condensate at atmospheric pressure
- The correct value of 0° C on the Kelvin scale is
- 273.15 K
- 273 K
- 273.85 k
- 273.25 k
- Light year is a unit of
- Time
- Distance
- Mass
- Energy
- Temperature sensing can be achieved by the use of
- Thermocouples
- RTDs
- Thermistors
- All of these
- What causes the piezoelectric effect?
- Heat or dissimilar metals
- Water running on iron
- A magnetic field
- Pressure on a crystal
- Which among the following is not a fire tube boiler?
- Cochran boiler
- Babcock and Wilcox boiler
- Lancashire boiler
- Locomotive boiler
- Which among the following is the characteristic of Cochran boiler?
i. Vertical, multi-tube boiler.
ii. Used for small capacity steam generation.
iii. Water tube boiler.- i, ii and iii are true
- i and iii are true
- i and ii are true
- Only iii is true
- What is the main requirement of locomotive boiler?
- Easy maintenance
- Compact in size
- Any type of fuel can be used
- Produces steam at very high rate
- What is the operating pressure range of a Babcock and Wilcox boiler?
- 11.5 - 17.5 bar
- 17.5 - 22.5 bar
- 22.5 - 27.5 bar
- 5.5 - 11.5 bar
- Which among the following boilers have minimum draught loss?
- Lancashire boiler
- Scotch-marine boiler
- Babcock and Wilcox boiler
- Cochran boiler
- Which boiler is used in ships?
- Cornish boiler
- Locomotive boilers
- Scotch-marine boiler
- Cochran boiler
- What is the rating of Fluidised Bed Boilers (FBB)?
- 200 bar and 400° C
- 150 bar and 400° C
- 200 bar and 450° C
- 150 bar and 450° C
- Where among the following is Waste Heat Recovery boiler is used?
i. Copper smelting industry.
ii. Steel mills.
iii. Pulp and paper.
iv. Refineries.- i, ii and iii
- ii, iii and iv
- i, ii and iv
- i, ii, iii and iv
- The material used to control SOx in the FBC boiler is
- Lime
- Alumina
- Silica
- Limestone
- In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the otherend is connected to
- Steam space
- Water space also
- Chimney
- Superheater
- Select a device which is not a boiler mountings?
- Safety valve
- Water level indicator
- Economiser
- Pressure Gauge
- State the location of safety valve in a boiler
- Top of boiler shell
- Right side of boiler shell
- Bottom of boiler shell
- Left side of boiler shell
- Where is High-steam low water safety valve used?
- Cochran boiler
- Lancashire boiler
- Babcock and Wilcox boiler
- Locomotive boiler
- Which among the following pressure measuring instrument is used as a pressure gauge in boiler?
- Bellows
- Magnetic coupling
- Bourdon-tube
- Mc-Leod gauge
- What is the function of fusible plug?
- Regulate pressure inside boiler
- Supply excess water needed
- Check water level
- Put-off fire in furnace, as water level fall
- What is the function of boiler accessories?
- For operation and safety of boiler
- For cleaning and maintenance
- For increasing overall efficiency of boiler
- Auxiallary part to support boiler
- Which among the following boiler accessories preheats boiler feed water?
- Air-preheaters
- Economiser
- Super-heaters
- Water-feeding equipment
- Where is air preheater placed?
- After the economizer
- In the furnace
- Before the economizer
- In the chimney
- What is/are the advantage/s of super heater?
i. It increases specific steam consumption of engines and turbines.
ii. It eliminates the erosion of the turbine blades.
iii. It reduces condensation losses in pipes and engine cylinder.
iv. Efficiency of steam plant is higher.- i and iv
- ii and iv
- i, ii and iv
- i, ii, iii and iv
- What are the functions of blow-off cock?
i. Empty boiler for cleaning and maintenance purpose.
ii. Supply water to the boiler high pressure continuously.
iii. Prevent the back-flow of water from boiler to pump.
iv. Discharge mud and sediments accumulated at the bottom of the boiler.- i and iii
- ii and iii
- i and iv
- ii and iv
- Which of the following is the best way to assess boiler losses?
- Benchmarking evaporation ratio
- Indirect efficiency evaluation
- Direct efficiency evaluation
- None of these
- A boiler trial indicated 2% O2 at boiler exit and 7% O2 at stack. The in-leak air quanity between these two measurement is
- 25%
- 50%
- 40%
- 5%
- Enthalpy of evaporation of steam will be higher at
- 2 kg/cm2
- 8 kg/cm2
- 12 kg/cm2
- 20 kg/cm2
- The element that does not contribute to heating value during combustion process is
- Sulphur
- Hydrogen
- Carbon
- Nitrogen
- Which of the following is not one of the 3 T's of combustion?
- Time
- Temperature
- Turbulence
- Tertiary
- Which of the following is not required in the boiler efficiency evaluation by direct method?
- Steam flow
- Fuel flow
- Oxygen % in the flue gas
- Feed water temperature
- The dry saturated steam when throttled to a lower pressure will
- Become wet
- Become superheated
- Remain dry saturated
- Become condensate
- Velocity of steam in a pipe does strongly depend on
- Number of bends and valves in the pipe
- Specific volume of steam
- Length of the pipe
- None of these
- Latent heat of steam at the critical point is
- Zero
- 540 kCal/kg
- Infinite
- Equal to sensible heat
- Furnace oil contains 84% carbon by weight. How many kg of CO2 does complete combustion of 1 kg of furnace oil generate?
- 2.4
- 4
- 3.6
- 3.1
- Which fuel releases the most energy per kg on complete combustion?
- Carbon
- Sulphur
- Hydrogen
- Nitrogen
- How many kg of CO2 are produced in complete combustion of 16 kg of Methane?
- 42
- 44
- 16
- 48
- In flue gas the theoretical CO2 is 15.5% and measured CO2 is 11% by volume. The percentage of excess air will be
- 40.90%
- 90.90%
- 240.90%
- 140.90%
- To drain condensate from main steam line, the following type of trap is a suitable trap
- Float
- Bimetallic
- Thermodynamic
- None of these
- With increase in the percentage of excess air for combustion of coal, percentage of CO2 in flue gas.
- Decreases
- Increases
- Remains same
- None of these
- The minimum capacity of any closed vessel which generates steam under pressure as per Indian Boilers Regulation Act is
- 2.275 litres
- 22.75 kilo litres
- 227.5 litres
- 22.75 litres
- If pressure of saturated steam increases then
- Enthalpy of steam goes up
- Enthalpy of steam goes down
- Enthalpy of evaporation goes up
- None of these
- Water treatment for steam boilers is generally required to
- Remove hydrogen
- Prevent formation of scales
- Help improve combustion efficiency
- Reduce stack temperature
- The TDS level in boiler water for boiler blow down, is measured through
- Alkalinity of water
- Thermal conductivity of water
- Electrical conductivity of water
- Turbidity of water
- The heat which is required to change the phase from water at 100° C to saturated steam at 100° C at atm. pressure is
- Sensible heat
- Latent heat
- Super heat
- Specific heat
- The equipment having the highest efficiency in case of thermal power plant is
- Boiler
- Turbine
- Generator
- Cooling tower
- Excess air can be derived by measuring the % of _____________ in flue gases.
- CO
- O2
- N2
- SO2
- The heat loss dependant on chemical characteristics of liquid fuel is
- Unburnt loss
- Blowdown loss
- Radiation loss
- Hydrogen loss
- What type of steam is used for electric power generation in thermal power plants?
- High pressure with superheat
- Dry saturate
- Wet steam
- None of these
- High percentage of carbon monoxide present in the flue gas of boiler is an indicator of
- High excess air
- Complete combustion
- Good control of the pollutants
- Low excess air
- Reverse osmosis for water treatment involves
- Removal of alkali salts
- Removal of total salts
- Removal of only hardness causing salts
- Removal of non-hardness salts
- When 100 kg of fuel with 60% carbon is burnt with theoretical air, the mass of CO2 released is
- 319 kg
- 4400 kg
- 220 kg
- 4500 kg
- Reduction of steam pressure in a process heating application will
- Reduce the steam temperature
- Reduce the sensible heat
- Increase the enthalpy of evaporation
- All of these
- When pure hydrogen is burned, with theoretical air, the volume percentage of nitrogen in flue gas on dry basis will be?
- 100%
- 79%
- 21%
- 0%
- Which of the following is not true of steam?
- Highest specific heat and latent heat
- Low heat transfer coefficient
- Easy to control and distribute
- Cheap and inert
- The draught produced by the chimney is due to the
- Density difference between the column of hot gases inside the chimney and the cold air outside
- Pressure difference between the column of hot gases inside the chimney and the cold air outside
- Velocity difference between the column of hot gases inside the chimney and the cold air outside
- All of these
- The efficiency of the chimney is directly proportional to the
- Height of the chimney
- Bottom area of the chimney
- Top area of the chimney
- None of these
- The theoretical available draught at about __________ percentage of total static draught calculated.
- 20
- 40
- 60
- 80
- The function of a chimney in forced draught is
- To produce draught
- To discharge gases high into the atmosphere
- To make draught and discharge gases to atmosphere
- None of these
- Induced draught is used when
- An economizer is used
- An air preheater is used
- An economizer and air preheater are used
- None of these
- Which is not true in the case of a steam jet draught?
- It occupies minimum space
- It can't be started until high pressure steam is available
- Many classes of low grade fuels can be used
- Maintenance cost is very high
- The efficiency of artificial draught is nearly
- 7%
- 15%
- 25%
- 30%
- The efficiency of the chimney draught is hardly
- 7%
- 5%
- 3%
- 1%
- The fuel burning capacity of the mechanical grate draught in comparison with natural draught is
- Less
- High
- Same
- No comparison
- Which of the following statement is true as for as natural draught is concerned?
- No smoke
- Height of the chimney is less
- The running and maintenance cost is practically nil
- Low grade fuel can be used
- Which of the following fuel has maximum calorific value?
- Paraffin
- Petrol
- Hydrogen
- Fuel oil
- What is the use of Orsat Apparatus?
- To do volumetric analysis of dry flue gas
- To measure the calorific value of fuel
- To measure the water vapour contained in fuel
- To measure the size of the coal
- What is the higher calorific value of Natural Gas in (KJ/Cub.M)?
- 12200
- 37800
- 6080
- 37000
- Water flow through pipe is measured by
- X-Rays
- Pitot Tube
- Electric Field
- Laser beams
- Reverse osmosis for water treatment involves
- Removal of total salts
- Removal of only hardness causing salts
- Removal of alkali salts
- Removal of non-hardness salts
- Who is known as the "Father of New France"?
- Christopher Columbus
- Samuel de Champlain
- Francisco Pizarro
- Bartolome de Las Casas
- Indulekha is the heroin of the famous Malayalam novel "Indulekha" written by O. Chandumenon. Who is the hero of the novel?
- Mahaveeran
- Mahadevan
- Madhavan
- Soori Namboothirippad
- Who is called "Praschanna Buddha"?
- Sankaracharya
- Sri Buddha
- Sahodaran Ayyappan
- C. V. Kunjuraman
- Who acts as the constitutional head?
- Governor
- Dr. B. R. Ambedkar
- Prime Minister
- President
- The Right to Information Act introduced in
- 2004
- 2005
- 2008
- 2009
- What do you mean by Artificial Ground Water - recharge?
- Collection of rain water from the roof top into a collection tank
- Collection of rain water from the roof top into wells
- Allow the roof water in the channels
- Nothing to do with collecting roof water
- In which place Clive established Double Government?
- Madras
- Delhi
- Bengal
- Hyderabad
- Pick one which is not a cause of Muslim communalism
- British Policy of Divide and Rule
- Rise of Hindu reformers
- Demand for communal representation
- Govt. Policies of suppression
- White paper is related to
- Containing proposals for constitutional changes in India
- Agreement of Britain to quit India
- Agreement signed by the Indian rulers with the English East India Company
- None of these
- To uphold and protect the sovereignty, unity and integrity of India. This comes under which category?
- Fundamental Rights
- Fundamental Principles
- Fundamental Duties
- Fundamental Theories
- Kandathil Varghese Mappilai is associated with
- Mathrubhumi
- Malayala Manorama
- Janayugom
- Deepika
- The 2nd part of the film Bahubali is named as
- Bahubali the completion
- Bahubali the end
- Bahubali Part II
- Bahubali the conclusion
- The translation of "Abhijana Sakuntalam" by
- Kerala Varma Valiya Koyi Thampuran
- Neelakantan Namboothiripad
- G. Sankaran Kurup
- Kunjikuttan Thampuran
- The Central Hindu College founded by Annie Besant later developed into
- Sankaracharya University
- Benaras University
- Benaras Hindu University
- Sankaracharya Sanskrit College
- Who said the temple entry proclamation is the "miracle of modern times"?
- Mannathu Padmanabhan
- Gandhiji
- K. Kelappan
- A. K. Gopalan
- The Savarna Jatha was led by
- Ayyankali
- K. K. Madhavan
- Chattampi Swamikal
- Mannathu Padmanabhan
- In relation to the National Movement in Travancore, Action Council of the State Congress was led by
- Accamma Cherian
- Pattom A. Thanu Pillai
- Ikkanda Warrier
- Ali Musaliar
- Who prepared the preamble of the Indian Constitution?
- Sardar Vallabh Bhai Patel
- M. N. Roa
- Jawaharlal Nehru
- B. R. Ambedkar
- Who became famous by his pen name "Kesari"?
- Ponkunnam Varkey
- Vengayil Kunhiraman Nayanar
- S. K. Pottakkad
- G. Sankara Kurup
- The Malayali memorial signed in
- 1891
- 1821
- 1857
- 1862
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