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In forced circulation type boiler

A. 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

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

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

Correct Answer :

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


Related Questions

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The variation of steam pressure in the nozzle depends upon

A. Velocity of steam

B. Specific volume of steam

C. Dryness fraction of steam

D. All of these

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During storage, the heating value of coal

A. Increases

B. Decreases

C. Remain constant

D. May increase or decrease depending upon the method of storage

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Which of the following statement is wrong?

A. The factor of evaporation for all boilers is always greater than unity.

B. The amount of water evaporated in kg per kg of fuel burnt is called equivalent evaporation from and at 100° C.

C. The ratio of heat actually used in producing the steam to the heat liberated in the furnace is called boiler efficiency.

D. None of the above

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A turbine is said to have an axial discharge when the steam leaves the blade tip at _________ to the direction of the blade motion.

A. 60°

B. 90°

C. 180°

D. 270°

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Benson boiler requires

A. No drum

B. One drum

C. Two drums

D. Three drums

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During polytropic process

A. Heat transfer takes place across cylinder walls

B. Work is done

C. Steam may be wet, dry or superheated after expansion

D. All of the above

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A wet vapour can be completely specified by

A. Pressure only

B. Temperature only

C. Dryness fraction only

D. Pressure and dryness fraction

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The water tubes in a Babcock and Wilcox boiler are

A. Horizontal

B. Vertical

C. Inclined

D. Horizontal and inclined

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The value of the reheat factor varies from

A. 1.02 to 1.06

B. 1.08 to 1.10

C. 1.2 to 1.6

D. 1.6 to 2

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The pressure of steam __________ while flowing through a nozzle.

A. Increases

B. Decreases

C. Remains constant

D. None of these

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Locomotive boiler is of the following type

A. Multi tubular

B. Horizontal

C. Internally fired

D. All of the above

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The temperature of flue gases at air heater outlet should be

A. 100°C

B. Above dew point temperature of flue gases

C. Below dew point temperature of flue gases

D. Less than wet bulb temperature of flue gases

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The expansion of steam in a nozzle follows

A. Carnot cycle

B. Rankine cycle

C. Joule cycle

D. Stirling cycle

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Which of the following statement is correct?

A. The efficiency of steam turbines is greater than steam engines

B. A flywheel is a must for steam turbine

C. The turbine blades do not change the direction of steam issuing from the nozzle

D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades

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Desecration of feed water is carried out because it reduces

A. Cavitation of boiler feed pumps

B. Corrosion caused by oxygen

C. Heat transfer coefficient

D. pH value of water

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The turbine blades are

A. Straight

B. Circular

C. Curved

D. None of these

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The factor of evaporation for all boilers is always

A. Equal to unity

B. Less than unity

C. Greater than unity

D. None of these

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Cut-off governing as compared to throttle governing is

A. Less efficient and less economical

B. Less efficient and more economical

C. More efficient and less economical

D. More efficient and more economical

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Maximum energy loss in a boiler occurs due to

A. Unburnt carbon in ash

B. Incomplete combustion

C. Ash content

D. Flue gases

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Water tube boilers are

A. Internally fired

B. Externally fired

C. Internally as well as externally fired

D. None of these

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Relative percentage of heat absorbed through the heat transfer of (i) Furnace water wall (ii) Boiler tank (iii) Superheater (iv) Economiser (v) Air-heater of a typical boiler of 200 MW capacity would be of the order of

A. 48 : 20 : 15 : 7 : 10

B. 10 : 7 : 15 : 20 : 48

C. 20 : 48 : 7 : 15 : 10

D. 7 : 15 : 20 : 10 : 48

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In order to reduce the rotor speed of an impulse turbine, the method employed is

A. Velocity compounding

B. Pressure compounding

C. Pressure-velocity compounding

D. All of these

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Which of the following varieties of coals is mostly used in steam boilers?

A. Non-coking bituminous coal

B. Brown coal

C. Peat

D. None of the above

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The number of flue tubes in Lancashire boiler is

A. Zero

B. One

C. Two

D. Four

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Which of the following gases has the highest calorific value?

A. Producer gas

B. Coal gas

C. Water gas

D. Blast furnace gas

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The fire tubes in a Scotch marine boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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The maximum efficiency of a De-Laval turbine is (where α = Nozzle angle)

A. sin²α

B. cos²α

C. tan²α

D. cot²α

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The ratio of the energy required to produce the artificial draught (expressed in metres head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

A. Efficiency of the boiler

B. Efficiency of the chimney

C. Efficiency of the fan

D. Power of the boiler

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A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

A. Steam condenser

B. Steam boiler

C. Steam preheater

D. Economiser

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The impulse reaction turbine has its driving force

A. As an impulsive force

B. As a reaction force

C. Partly as an impulsive force and partly as a reaction force

D. None of the above