2051. Heating wet steam at constant temperature is heating it at constant_________________?
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A. entropy

B. volume

C. enthalpy

D. none of the above

E. pressure
2052. The economizer is used in boilers to _______________________?
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A. extract heat from the exhaust flue gases

B. to heat feed water by bled steam

C. economise on fuel

D. increase flue gas temperature

E. increase thermal efficiency of boiler
2053. Lancashire boiler is a__________________?
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A. stationary water tube boiler

B. water tube boiler with natural/forced circulation

C. stationary fire tube boiler

D. none of the above

E. mobile fire tube boiler

2054. Steam in water tube boiler as compared to fire tube boiler_________________?
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A. is raised at same rate

B. could be raised at fast/slow rate depending on design

C. none of the above is true

D. can be raised rapidly

E. is raisd at slower rate

2055. Gradually varied flow is__________________?
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A. steady non-uniform

B. steady uniform

C. non-steady non-uniform

D. true one-dimensional

E. non-steady uniform

2056. The fire tubes in, a Coarran and Scotish marine boiler are_________________?
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A. horizontal

B. vertical

C. inclined

D. both horizontal and vertical

E. horizontal and inclined

2057. The continuity equation is connected with__________________?
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A. conservation of mass

B. open channel/pipe flow

C. viscous/unviscous fluids

D. compressibility of fluids

E. steady/unsteady flow

2058. The number of flue tubes in Lancashire boiler is_________________?
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A. zero

B. four

C. one

D. many

E. two
2059. Locomotive type boiler is__________________?
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A. water wall enclosed furnace type

B. vertical tubular fire tube type

C. horizontal multi-tubular fire tube type

D. horizontal multitubular water tube boiler

E. none of the above types

2060. Fire tube boilers are limited to a maximum design working pressure of ____________________?
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A. 1 kg/cm

B. 6 kg/cm

C. 250 kg/cm2

D. 100 kg/cm2

E. 17 kg/cm2
2061. In an immersed body, centre of pressure is __________________?
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A. below be centre of gravity

B. at the centre of gravity

C. could be above or below e.g. depending on density of body and liquid

D. above the centre of gravity

E. unpredictable

2062. Froude number is significant in__________________?
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A. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ships hulls

B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. none of the above

D. supersonics, as with projectile and jet propulsion

E. all of the above

2063. The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is____________________?
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A. 5.0 m

B. 2.5 m

C. 2.4 m

D. 4.0 m

E. 3.0 m
2064. The velocity of jet of water travelling out of opening in a tank filled with water is proportional to_________________?
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A. V/T

B. head of water (h)

C. h3/1

D. h2

E. h2

2065. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of g at this place is _________________?
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A. 9.75 m/sec2

B. 9 m/sec

C. 10m/sec2

D. 9.81 m/sec2

E. 10.2/m sec

2066. Which of the following is a water tube boiler_________________?
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A. Babcock and Wilcox boiler

B. Cochran boiler

C. locomotive boiler

D. Cornish boiler

E. Lancashire boiler

2067. For a body floating in a liquid the normal pressure exerted by the liquid acts at ____________________?
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A. bottom surface of the body

B. all of the above

C. e.g. of the body

D. metacentre

E. all points on the surface of the body
2068. Sublimation region is the region where__________________?
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A. liquid and vapour phases are in equilibrium

B. none of the above

C. solid and liquid phases are in equilibrium

D. solid and vapour phases are in equi-librium

E. solid, liquid and vapour phases are in equilibrium

2069. Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?
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A. former is used for high installed capacity

B. former occupies less space for same power

C. chances of explosion are less in former case

D. rate of steam flow is more in former case

E. former generates steam at high pressure

2070. The centre of gravity of the volume of the liquid displaced by an immersed body is called ___________________?
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A. metacentre

B. centre of gravity

C. centroid

D. centre of buoyancy

E. centre of pressure

2071. In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?
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A. W between P and F

B. F between W and P

C. none of the above

D. W, P and F all on one side

E. P between W and F
2072. Vacuum for reciprocating steam engines compared to steam turbines is__________________?
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A. equal

B. more

C. none of the above

D. could be more or less depending on the size of plant

E. less
2073. Which tool is used to measure gap size in a rough alignment?
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A. Measuring tape

B. Inside caliper

C. Feeler gage

D. Dial indicator

2074. Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?
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A. first decreases and then increases

B. decreases

C. remains unaffected

D. increases

E. first increases and then decreases

2075. The part of the coupling that actually transmits power and rotation from one shaft to the other shaft is_________?
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A. key

B. gap

C. driver

D. hub
2076. The hydraulic turbines are also known as : ___________?
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A. water turbines

B. steam turbines

C. combustion turbines

D. Gas turbines

2077. Sulphur content of fuels is very important to the plant operators because it____________________?
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A. has highly corrosive effect

B. facilitates ash removal

C. promotes complete combustion

D. retards electric precipitation

E. has high heating value

2078. The overall efficiency of thermal power plant is________________?
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A. boiler efficiency, turhine efficiecny, generator efficiency

B. regenerative cycle efficiency

C. all the three above plus gas cycle efficiency

D. rankine cycle efficiency

E. carnot cycle efficiency

2079. The behaviour of coal in a furnace is determained by_______________________?
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A. the proximate analysis

B. the content of sulphur

C. its type

D. the exact analysis

E. the content of ash and heating value

2080. Deaeration of feed water is carried out because it reduces ____________________?
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A. cavitation of .boiler feed pumps

B. weight of water to be handled

C. heat transfer coefficient

D. corrosion caused by oxygen

E. pH value of water

2081. In a recuperative air preheater, the heat is transferred____________________?
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A. heat is transferred by bleeding some gases from furnace

B. from a metal wall from one medium to another

C. from heating an itermediate material and then heating the air from this material

D. none of the above

E. by direct mixing ,

2082. The heat loss in a boiler takes place in the form of________________?
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A. moisture present in fuel and steam formed by combustion of hydrogen in fuel

B. radiation

C. all of the above

D. heat carried away by ash

E. heat carried away by flue gases

2083. Sulphur in coal results in___________________?
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A. all of the above

B. causing clinkering and slagging

C. facilitating ash precipitation

D. spontaneous combustion during coal storage

E. corroding air heaters

2084. Spontaneous combustion is a phenomenon in which____________________?
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A. all the fuel burns instantaneously producing high energy release

B. fuel burns with less air

C. none of the above

D. explosion in furnace

E. coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
2085. Thermal efficiency of a thermal power plant is of the order of___________________?
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A. 20%

B. 15%

C. 45%

D. 30%

E. 60%.

2086. An economiser in a boiler______________________?
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A. decreases fuel consumption

B. decreases steam pressure

C. increases steam flow

D. increases steam pressure

E. increases life of boiler

2087. Ball valves are commonly used to_________?
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A. check flow

B. change flow direction

C. start/stop flow

D. throttle flow

2088. The radius of a dished head is taken approximately as______________________?
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A. one

B. half

C. one-fourth

D. three

E. two

2089. Overfire burning is the phenomenon of _____________________?
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A. fuel bed firing

B. supply of excess, air

C. supply of excess coal

D. none of the above

E. burning CO and unburnts in upper zone of furnace by supplying more air
2090. What is the most common valve used in piping systems to throttle or regulate flow ?
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A. Gate valve

B. Globe valve

C. Butterfly valve

D. Plug valve

2091. The maximum discharge through a chimney occurs when the height of chimney is_____________________?
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A. more than the tallest building nearby

B. infinitely long

C. around 200 meters

D. equal to the height of the hot gas column producing draught

E. outside temperature is very low

2092. The average calorific value of wood is about : __________?
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A. 23000 kj/kg

B. 33500 kj/kg

C. 19700 kj/kg

D. 25000 kj/kg

2093. Film boling occurs at _______________________?
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A. very low pressure

B. none of the above

C. very high pressures

D. medium pressures

E. atmospheric pressures

2094. The function of injector used in small capacity boilers is to____________________?
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A. pump water, similar to boiler feed pump

B. add make up water in the system

C. create vacuum

D. none of the above

E. inject chemical solution in feed pump

2095. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?
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A. locomotive boiler

B. benson boiler

C. lancashire boiler

D. babcock and wilcox boiler

E. cochran boiler

2096. In forced circulation type boiler__________________?
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A. water is heated in a large number of tubes

B. water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C. heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

D. water is converted into steam in one pass without any recirculation

E. feed pump is employed to supplement natural circulation in water wall type furnace

2097. The three Ts for good combustion are____________________?
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A. temperature, time, and turbulance

B. thorough mixing, total air, and temperature

C. total air, time, and temperature

D. total air, true fuel, and turbulance

E. none of the above

2098. Pour point of fuel oil is the____________________?
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A. storage temperature

B. lowest temperature at which oil will flow under set condition

C. none of the above

D. temperature at which oil is transported

E. temperature at which fuel is pumped through burners

2099. The natural solid fuels are : ________?
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A. Peat

B. All of above

C. Wood

D. Lignite

2100. During storage, the heating value of coal __________________?
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A. decreases

B. increases

C. may increase or decrease depending upon the method of storage

D. remains constant

E. none of the above