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 :
A:-micrometre
B:-centimetre
C:-millimetre
D:-decimetre

Question2:-Pascal is the unit of
A:-Pressure
B:-Energy
C:-Work
D:-Power

Question3:-What is the dimensional formula of power?

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)?
A:-Pascal
B:-Newton
C:-Kilogram
D:-Joules

Question6:-Pyrometer is used to measure
A:-Pressure
B:-Viscosity
C:-Temperature
D:-Humidity

Question7:-Which among the following is the unit of specific heat in SI system?
A:-J
B:-J/kg
C:-J/kg/K
D:-J/kgK

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

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

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

Question12:-Heating dry steam above its saturation temperature is known as
A:-Sublimation
B:-Superheating
C:-Liquefaction
D:-None of these

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

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

Question15:-If the pressure is increased the boiling temperature of water
A:-Increases
B:-Decreases
C:-Doesn't change
D:-None of these

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

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

Question19:-The value of dryness fraction for dry steam is
A:-1
B:-0
C:-0.5
D:-0.25

Question20:-The specific volume of water ___________ when heated from 0°C.
C:-First decreases and then increases
D:-First increases and then decreases

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

Question22:-_________ is an example for water tube boiler.
A:-Cornish
B:-Lancashire
C:-Sterling
D:-Cochran

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

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

Question25:-Draught in locomotive boiler is produced with the help of
A:-Steam jet
B:-Chimney
C:-Draught Fan
D:-Damper

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

Question27:-_________ is an example for high pressure boiler.
A:-La Mont
B:-Benson
C:-Loefeller
D:-All of the above

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

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

Question30:-Which of the following boiler has single internal flue tube for hot gas passage?
A:-Cochran
B:-Lancashire
C:-Cornish
D:-Locomotive

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

Question32:-___________ is a part of steam generator in which phase change occurs.
A:-Super heater
B:-Evaporator
C:-Economiser
D:-Air pre heater

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

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

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

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

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

Question38:-What is the number of level indications in a boiler's water level indicator?
A:-4
B:-3
C:-2
D:-1

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

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

Question41:-In essence, a feed check valve is a ___________ way valve.
A:-Two
B:-One
C:-Three
D:-None of the above

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

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

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

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

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

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

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

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

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

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

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

(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

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

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

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

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

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

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

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

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

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
A:-1200
B:-1272
C:-1334
D:-1468

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

Question64:-The lowest grade coal containing moisture as high as 30% and high volatile matter is
A:-Bituminous coal
B:-Anthracite
C:-Lignite
D:-Peat

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

Question66:-The primary component of Liquefied Petroleum Gas is
A:-Butane
B:-Propane
C:-Ethane
D:-Methane

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

Question68:-Which is the best suited fuels for CI engine, considering knocking tendency?
A:-Naphthenes
B:-Olefins
C:-Paraffins
D:-Aromatics

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

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

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

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

Question73:-The fuel which is the cleanest of the fossil fuel is
A:-Gasoline
B:-Kerosene
C:-Liquefied Petroleum Gas
D:-Natural Gas

Question74:-_________ moles of nitrogen are present for every mole of oxygen in the air.
A:-3.76
B:-13.6
C:-37.6
D:-78

Question75:-Density is measured by an instrument called
A:-Barometer
B:-Hydrometer
C:-Pyrometer
D:-Oxymeter

Question76:-Flash point for furnace oil is
A:-100°C
B:-6°C
C:-16°C
D:-66°C

Question77:-The pour point of a fuel is the lowest temperature at which it will pour or flow when ___________ under prescribed conditions.
A:-Pressurized
B:-Heated
C:-Cooled
D:-Constant temperature

Question78:-The primary function of burner is to __________ fuel to millions of small droplets.
A:-Burn the
B:-Atomise
C:-Vapourise
D:-All the above

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

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
D:-zero

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

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

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

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

Question85:-The specific volume of water when heated from 0 degree C
A:-First increase and then decrease
B:-First decrease and then increase

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

Question87:-Turbidity in a boiler feed water causes
A:-Scale formation
B:-Corrosion
C:-Sludge
D:-Embrittlement

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
D:-Does not depend on temperature

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

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

Question91:-What salts of calcium and magnesium cause temporary hardness of boiler feed water?
A:-Bicarbonate
B:-Chlorides
C:-Nitrates
D:-Manganese

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

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

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

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

Question96:-Which of the following fitting is a boiler mounting?
A:-Superheater
B:-Economiser
C:-Feed check valve
D:-Air preheater

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

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

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

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