Boiler Attendant Question Paper and Answer Key

Question Paper Code: 19/2024/OL
Category Code: 193/2023
Exam: Boiler Attendant
Date of Test 13-03-2024
Department Kerala State Bamboo Corporation Ltd

Question1:-If a metre is divided into hundred equal parts, each part is equal to :
        Correct Answer:- Option-B

Question2:-Pascal is the unit of
        Correct Answer:- Option-A

Question3:-What is the dimensional formula of power?
Correct Answer:- Option-A

Question4:-Which among the following is the correct relation between absolute pressure, atmospheric pressure and gauge pressure?
Question5:-Which among the following is the unit of force (in SI system)?
        Correct Answer:- Option-B

Question6:-Pyrometer is used to measure
        Correct Answer:- Option-C

Question7:-Which among the following is the unit of specific heat in SI system?
        Correct Answer:- Option-D

Question8:-The amount of heat energy required to raise the temperature of one kilogram of a substance through one degree Celsius is known as
        A:-Latent Heat
        B:-Sensible heat
        C:-Specific heat
        D:-Heat of sublimation
        Correct Answer:- Option-C

Question9:-One bar is equal to

Question10:-The standard atmospheric pressure is taken as
        A:-760 mm of Hg
        B:-730 mm of Hg
        C:-1000 mm of Hg
        D:-950 mm of Hg
        Correct Answer:- Option-A

Question11:-The saturated liquid line and saturated vapour line meets at
        A:-Ice point
        B:-Triple point
        C:-Critical point
        D:-Boiling point
        Correct Answer:- Option-C

Question12:-Heating dry steam above its saturation temperature is known as
        D:-None of these
        Correct Answer:- Option-B

Question13:-The steam having particles of water in suspension is termed as
        A:-Dry steam
        B:-Superheated steam
        C:-Wet steam
        D:-None of these
        Correct Answer:- Option-C

Question14:-The amount of heat absorbed to evaporate 1 kg of water from its saturation temperature, without change of temperature is known as
        A:-Sensible heat
        B:-Latent heat of vaporization
        C:-Enthalpy of steam
        D:-None of these
        Correct Answer:- Option-B

Question15:-If the pressure is increased the boiling temperature of water
        C:-Doesn't change
        D:-None of these
        Correct Answer:- Option-A

Question16:-Which among the following is not used for measuring dryness fraction?
        A:-Bucket calorimeter
        B:-Separating calorimeter
        C:-Separating and throttling calorimeter
        D:-Bomb calorimeter
        Correct Answer:- Option-D

Question17:-Specific enthalpy of wet steam is given by

Question18:-The numerical amount by which the temperature of a superheated vapour exceeds the saturation temperature is known as
        A:-Latent heat
        B:-Sensible heat
        C:-Degree of super heat
        D:-None of these
        Correct Answer:- Option-C

Question19:-The value of dryness fraction for dry steam is
        Correct Answer:- Option-A

Question20:-The specific volume of water ___________ when heated from 0°C.
        A:-Increases steadily
        B:-Decreases steadily
        C:-First decreases and then increases
        D:-First increases and then decreases
        Correct Answer:- Option-C

Question21:-The steam generators designed to operate above critical pressure is known as
        A:-Once through boiler
        B:-Sub Critical boiler
        C:-Drum boiler
        D:-All of the above
        Correct Answer:- Option-A

Question22:-_________ is an example for water tube boiler.
        Correct Answer:- Option-C

Question23:-Boiler rating usually defined in terms of
        A:-Maximum temperature of steam in K
        B:-Heat transfer rate in kJ/h
        C:-Heat transfer area in
        D:-Steam output in kg/h
        Correct Answer:- Option-D

Question24:-Steam power plants work on which cycle
        A:-Otto cycle
        B:-Carnot cycle
        C:-Diesel cycle
        D:-Rankine cycle
        Correct Answer:- Option-D

Question25:-Draught in locomotive boiler is produced with the help of
        A:-Steam jet
        C:-Draught Fan
        Correct Answer:- Option-A

Question26:-Water circulation in Babcock Wilcox boiler is maintained by
        A:-Conductive current
        B:-Convective current
        C:-Radiative current
        D:-All of the above
        Correct Answer:- Option-B

Question27:-_________ is an example for high pressure boiler.
        A:-La Mont
        D:-All of the above
        Correct Answer:- Option-D

Question28:-Blowing down of boiler water is the process of
        A:-Reducing boiler pressure
        B:-Increasing the steam pressure
        C:-Controlling the solid concentration in the boiler water
        D:-None of the above
        Correct Answer:- Option-C

Question29:-________ is the platform in the furnace on which fuel is burnt.
        A:-Ash pit
        C:-Fire Door
        D:-None of the above
        Correct Answer:- Option-B

Question30:-Which of the following boiler has single internal flue tube for hot gas passage?
        Correct Answer:- Option-C

Question31:-_________ is an example for low pressure boiler.
        A:-Babcock Wilcox
        C:-Scotch Marine
        D:-All of the above
        Correct Answer:- Option-C

Question32:-___________ is a part of steam generator in which phase change occurs.
        A:-Super heater
        D:-Air pre heater
        Correct Answer:- Option-B

Question33:-Which of the following is a boiler accessories?
        B:-Fusible plug
        C:-Pressure gauge
        D:-Blow-off cock
        Correct Answer:- Option-A

Question34:-Which component on boiler is used to increase the temperature of steam above saturation temperature?
        A:-Air Preheater
        C:-Super heater
        D:-None of the above
        Correct Answer:- Option-C

Question35:-Regarding fusible plugs, which of the following claims is FALSE?
        A:-When the water level is low, it puts out the fire
        B:-It keeps the boiler from becoming too hot
        C:-It should melt at very high temperatures
        D:-This requires renewal after a certain amount of time
        Correct Answer:- Option-C

Question36:-An air preheater
        A:-expands the boiler's evaporative capacity
        B:-improves the boiler's efficiency
        C:-enables the burning of inferior fuel
        D:-all of the above
        Correct Answer:- Option-D

Question37:-Which of the following feed pump-related assertions is TRUE?
        A:-It serves as the boiler's feed water delivery system
        B:-To remove steam from the boiler, use this device
        C:-It is a boiler mounting
        D:-All of the above
        Correct Answer:- Option-A

Question38:-What is the number of level indications in a boiler's water level indicator?
        Correct Answer:- Option-C

Question39:-What is the purpose of the boiler's pressure gauge?
        A:-To display the steam pressure as gauge pressure
        B:-To display the steam pressure as absolute pressure
        C:-To display the water pressure as gauge pressure
        D:-To display the water pressure as absolute pressure
        Correct Answer:- Option-A

Question40:-A gauge similar to the steam stop valve is
        A:-Feed Check Valve
        B:-Blow Down Valve
        C:-Junction Valve
        D:-Safety Valve
        Correct Answer:- Option-C

Question41:-In essence, a feed check valve is a ___________ way valve.
        D:-None of the above
        Correct Answer:- Option-B

Question42:-What is the purpose of a boiler's blowdown valve?
        A:-To get rid of sludge
        B:-To get rid of ash
        C:-To get rid of steam
        D:-All of the above
        Correct Answer:- Option-A

Question43:-What a safety valve does is?
        A:-Protect the firebox crown plate or fire tube from burning
        B:-Regulates the flow of water in to the boiler
        C:-Maintain constant pressure on the delivery side
        D:-Regulates excessive steam pressure inside the boiler
        Correct Answer:- Option-D

Question44:-Which of the following is not a boiler mounting?
        A:-Pressure gauge
        B:-Steam stop valve
        C:-Fusible plug
        D:-None of the above
        Correct Answer:- Option-D

Question45:-The function of _________ is to separate the water particle in suspension that are carried by the steam coming from the boiler.
        A:-Steam trap
        B:-Air preheater
        C:-Steam separator
        D:-Feed water pump
        Correct Answer:- Option-C

Question46:-Turbine draught is another name for
        A:-Induced draught
        B:-Forced draught
        C:-Mechanical draught
        D:-Balanced draught
        Correct Answer:- Option-B

Question47:-The draught system that is mostly used by Modern boilers are of
        A:-Natural draught firing
        B:-Balanced draught firing
        C:-Forced draught firing
        D:-Induced draught firing
        Correct Answer:- Option-B

Question48:-A locomotive boiler generally utilises a
        A:-Forced steam jet draught
        B:-Forced draught
        C:-Induced steam jet draught
        D:-Induced draught
        Correct Answer:- Option-C

Question49:-A chimney is 20 m high and the temperature of hot gases inside the chimney is 327°C. The temperature of outside air is 27°C and furnace is supplied
with 10 kg of coal burnt. Then, the draught head in metres of hot gases is
        A:-18.18 m
        B:-9.52 m
        C:-20.16 m
        D:-10.74 m
        Correct Answer:- Option-A

Question50:-In comparing an induced draught fan with respect to a forced draught fan, the operation and maintenance cost of induced draught fan will be
        A:-Lower for same conditions
        B:-Higher for same conditions
        C:-Almost same
        D:-None of these
        Correct Answer:- Option-B

Question51:-Draught loss is due to
        A:-Head loss due to fuelled resistance
        B:-Loss due to friction in the gas flow circuit
        C:-Due to flow resistance offered by chimney
        D:-All of these
        Correct Answer:- Option-D

Question52:-An induced draught blower is usually placed
        A:-Near to the base of the boiler
        B:-Near to the base of the chimney
        C:-Near to the base of the economiser
        D:-Near to the base of the superheater
        Correct Answer:- Option-B

Question53:-Read the statements:
(i)     Induced draught blowers are larger in size in comparison to Forced draught fan
(ii)    Forced draught fans requires more power in comparison to induced draught fan
(iii)   Induced draught fans require special bearings to handle the flue gas
(iv)   Forced draught fans can be 1.3 times in size in comparison to Induced draught fan
Which of the given statement are true?
        A:-Statements 1, 2, 3 and 4
        B:-Statements 3 and 4 only
        C:-Statements 1 and 3 only
        D:-Statements 2, 3 and 4
        Correct Answer:- Option-C

Question54:-Boilers when operating in balanced draught the pressure will be
        A:-Slightly positive gauge pressure
        B:-Atmospheric pressure
        C:-Slightly negative gauge pressure
        D:-None of these
        Correct Answer:- Option-C

Question55:-Which of the below mentioned phrase is not true with respect to natural draught system?
        A:-Long chimney
        B:-Less maintenance required
        C:-No flexibility in operation
        D:-High efficiency
        Correct Answer:- Option-D

Question56:-The evaporative capacity of a boiler may be expressed in terms of
        A:-kg of steam/h
        B:-kg of steam/h/ of heating surface
        C:-kg of steam/kg of fuel fired
        D:-All of the above
        Correct Answer:- Option-D

Question57:-In the following statements regarding direct method for boiler efficiency which option is not true?
        A:-Plant people can evaluate quickly the efficiency of boilers
        B:-Calculate various losses accountable for various efficiency levels
        C:-Require few parameters for computation
        D:-Needs few instruments for monitoring
        Correct Answer:- Option-B

Question58:-The efficiency which represents the effectiveness of the burner only and relates to its ability to completely burn the fuel
        A:-Combustion Efficiency
        B:-Thermal Efficiency
        C:-Fuel to steam Efficiency
        D:-Boiler Efficiency
        Correct Answer:- Option-A

Question59:-The instrument which regulates the flow of water under pressure to the boiler drum is
        A:-Stop valve
        B:-Junction valve
        C:-Feed Check Valve
        D:-Flow regulator valve
        Correct Answer:- Option-C

Question60:-Whenever boiler cleaning and inspection are due water inside the tubes and in the boiler, drum can be completely drained by operating the
        A:-Blow off Cock
        B:-Relief valve
        C:-Fusible plug
        D:-Drain valve
        Correct Answer:- Option-A

Question61:-The ratio of heat received by 1 kg of water under working conditions to that received by 1 kg of water evaporated from and at 100°C
        A:-Evaporation Constant
        B:-Factor of Evaporation
        C:-Equivalent Evaporation
        D:-None of these
        Correct Answer:- Option-B

Question62:-The equivalent evaporation (kg/h) of a boiler producing 1200 kg/h of steam with enthalpy content of 2543 kJ/kg from feed water at 70°C, Take enthalpy
of vaporization of water at 100°C=2250 kJ/h
        Correct Answer:- Option-A

Question63:-Which of the mentioned statement is not generally a result of boiler trial?
        A:-Steam generation capacity
        B:-Boiler safety check
        C:-Heat balance sheet
        D:-Thermal efficiency of boiler
        Correct Answer:- Option-B

Question64:-The lowest grade coal containing moisture as high as 30% and high volatile matter is
        A:-Bituminous coal
        Correct Answer:- Option-C

Question65:-The analysis which gives the chemical elements that comprise the coal substance, together with ash and moisture is known as
        A:-Chemical analysis
        B:-Ultimate analysis
        C:-Proximate analysis
        D:-Fuel analysis
        Correct Answer:- Option-B

Question66:-The primary component of Liquefied Petroleum Gas is
        Correct Answer:- Option-A

Question67:-Bomb calorimeter is one of the ways to get the heating value of solid and liquid fuels when burnt at
        A:-Constant Pressure
        B:-Constant Volume
        C:-Constant Entropy
        D:-Constant Enthalpy
        Correct Answer:- Option-B

Question68:-Which is the best suited fuels for CI engine, considering knocking tendency?
        Correct Answer:- Option-C

Question69:-Gasoline has a specific gravity in the range of about
        A:-0.55 - 0.62
        B:-0.70 - 0.78
        C:-0.82 - 0.86
        D:-0.63 - 0.68
        Correct Answer:- Option-B

Question70:-The gas obtained by partial combustion of coke or coal in the presence of air and steam mixture is
        A:-Producer gas
        B:-Coal gas
        C:-Coke oven gas
        D:-Water gas
        Correct Answer:- Option-A

Question71:-Calorific value obtained from a bomb calorimeter is
        A:-Lower calorific value
        B:-Higher calorific value
        C:-Enthalpy of formation
        D:-Enthalpy of reactants
        Correct Answer:- Option-B

Question72:-Which of the following statement regarding gaseous fuel is not true in comparison to solid or liquid fuels?
        A:-The rate of combustion and temperature can be easily controlled
        B:-Combustion efficiency is more due to the necessity of minimum amount of excess air
        C:-They have low heat content
        D:-They can be directly used as fuels in internal combustion engines
        Correct Answer:- Option-C

Question73:-The fuel which is the cleanest of the fossil fuel is
        C:-Liquefied Petroleum Gas
        D:-Natural Gas
        Correct Answer:- Option-D

Question74:-_________ moles of nitrogen are present for every mole of oxygen in the air.
        Correct Answer:- Option-A

Question75:-Density is measured by an instrument called
        Correct Answer:- Option-B

Question76:-Flash point for furnace oil is
        Correct Answer:- Option-D

Question77:-The pour point of a fuel is the lowest temperature at which it will pour or flow when ___________ under prescribed conditions.
        D:-Constant temperature
        Correct Answer:- Option-C

Question78:-The primary function of burner is to __________ fuel to millions of small droplets.
        A:-Burn the
        D:-All the above
        Correct Answer:- Option-B

Question79:-Inspection procedure of boilers for the renewal of certificates is to apply along with fees as per __________ before expiry of the certificate.
        A:-Annexure C
        B:-Annexure 2
        C:-Annexure A
        D:-Annexure 2B
        Correct Answer:- Option-A

Question80:-The higher calorific value of fuel whose composition is C=86%, S=6%, incombustible=8%
        A:-will be higher than its lower calorific value
        B:-will be lower than its lower calorific value
        C:-will be same as than its lower calorific value
        Correct Answer:- Option-C

Question81:-Bomb calorimeter is used to determine the calorific value of
        A:-Solid fuels only
        B:-Solid as well as liquid fuels
        C:-Liquid fuels only
        D:-Gaseous fuels
        Correct Answer:- Option-B

Question82:-Orsat apparatus is used to determine
        A:-Products of all constituents of fuel combustion by weight
        B:-Products of only dry constituents of fuel combustion by volume
        C:-Products of all constituents of fuel combustion by volume
        D:-Products of only dry constituents of fuel combustion by weight
        Correct Answer:- Option-B

Question83:-Proximate analysis of fuel means, determination
        A:-Lower calorific value
        B:-Higher calorific value
        C:-Percentages of carbon, hydrogen, nitrogen, sulfur and moisture
        D:-Percentage of fixed carbon, ash, volatile matter and moisture
        Correct Answer:- Option-D

Question84:-The ratio of specific heats of gas at constant pressure and constant volume is
        A:-always constant
        B:-always varies with pressure
        C:-always varies with temperature
        D:-none of the above
        Correct Answer:- Option-C

Question85:-The specific volume of water when heated from 0 degree C
        A:-First increase and then decrease
        B:-First decrease and then increase
        C:-Increase steadily
        D:-Decrease steadily
        Correct Answer:- Option-B

Question86:-The temperature of flue gases entering the air preheater of steam generator installation is recommended to be
        A:-less than wet bulb temperature
        B:-more than wet bulb temperature
        C:-less than dew point temperature
        D:-more than dew point temperature
        Correct Answer:- Option-D

Question87:-Turbidity in a boiler feed water causes
        A:-Scale formation
        Correct Answer:- Option-C

Question88:-Thermal conductivity of water
        A:-First increases with temperature and then decreases with temperature
        B:-First decreases with temperature and then increases with temperature
        C:-Increases steadily
        D:-Does not depend on temperature
        Correct Answer:- Option-A

Question89:-Which is not the desirable property of a good fuel?
        A:-Economical in cost
        B:-Minimum sulphur content
        C:-High ignition point
        D:-High heating value
        Correct Answer:- Option-C

Question90:-Oxygen can be removed from the boiler feed water by the addition of
        B:-Calcium carbonate
        C:-Sodium sulphite
        D:-Cuprous chloride
        Correct Answer:- Option-C

Question91:-What salts of calcium and magnesium cause temporary hardness of boiler feed water?
        Correct Answer:- Option-A

Question92:-The economiser unit of a boiler is located between
        A:-Forced draught fan and furnace
        B:-Superheater and air preheater
        C:-Air preheater and chimney
        D:-Furnace and superheater
        Correct Answer:- Option-B

Question93:-What is the function of a steam trap?
        A:-To arrest water particle going along with steam
        B:-To drain off water resulting from partial consideration of steam in pipes
        C:-To prevent steam from leaking out from the boiler
        D:-To regulate the steam flow rate from the boiler
        Correct Answer:- Option-B

Question94:-Superheating of steam is done at
        A:-Constant volume
        B:-Constant temperature
        C:-Constant pressure
        D:-Constant entropy
        Correct Answer:- Option-C

Question95:-The maximum energy loss in a boiler occurs due to
        A:-Unburnt carbon in ash
        B:-Incomplete combustion
        C:-Ash content
        D:-Flue gases
        Correct Answer:- Option-D

Question96:-Which of the following fitting is a boiler mounting?
        C:-Feed check valve
        D:-Air preheater
        Correct Answer:- Option-C

Question97:-Dryness fraction of wet steam is given by
        A:-ratio of mass of dry steam to the mass of suspended liquid water
        B:-Ratio of mass of suspended liquid water to mass of dry steam
        C:-Ratio of mass of dry steam to the sum of mass of suspended liquid water and dry steam
        D:-Ratio of sum of mass of suspended liquid water and dry steam to the mass of dry steam
        Correct Answer:- Option-C

Question98:-If a fan is installed near the base of a boiler to force air through fuel and another fan is installed near the base of the chimney to suck the gas from
boiler, the type of draught produced is called
        A:-Forced draught
        B:-Induced draught
        C:-Natural draught
        D:-Balanced draught
        Correct Answer:- Option-D

Question99:-A benson boiler requires
        A:-No drum
        B:-One drum
        C:-Two drum
        D:-Three drum
        Correct Answer:- Option-A

Question100:-Equivalent evaporation means
        A:-Amount of water evaporated per kg of fuel burnt
        B:-Amount of steam produced per kg/hr
        C:-The evaporation of 15.563 kg of water per hour from and at 100 degree C
        D:-Amount of water evaporated from and at 100 degree in to dry and saturated steam at normal atmospheric pressure
        Correct Answer:- Option-D

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