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Current Affairs January 2024

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4

The amount of water evaporated in kg per kg of fuel burnt is called

A. Evaporative capacity of a boiler

B. Equivalent evaporation from and at 100° C

C. Boiler efficiency

D. None of these

Correct Answer :

A. Evaporative capacity of a boiler


Related Questions

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The heat balance sheet for the boiler shows the

A. Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

B. Moisture present in the fuel

C. Steam formed by combustion of hydrogen per kg of fuel

D. All of the above

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The increase in pressure

A. Lowers the boiling point of a liquid

B. Raises the boiling point of a liquid

C. Does not affects the boiling point of a liquid

D. Reduces its volume

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4

The nozzle efficiency is the ratio of

A. Workdone on the blades to the energy supplied to the blades

B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

D. None of the above

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4

In a steam engine, superheated steam from the boiler is fed into the steam chest at a pressure of

A. 10 atmospheres

B. 20 atmospheres

C. 30 atmospheres

D. 40 atmospheres

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4

In reaction turbines, the axial thrust is due to

A. Pressure drop across the rotor

B. Change in axial velocity

C. Both (A) and (B)

D. None of these

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4

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

A. More

B. Less

C. Same

D. Could be more or less depending on other factors

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4

The main object of a boiler trial is

A. To determine the generating capacity of the boiler

B. To determine the thermal efficiency of the boiler when working at a definite pressure

C. To prepare heat balance sheet for the boiler

D. All of the above

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4

The expansion of steam in a nozzle follows

A. Carnot cycle

B. Rankine cycle

C. Joule cycle

D. Stirling cycle

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4

The theoretical indicator diagram of a simple steam engine is based upon the assumption that

A. There is no pressure drop due to condensation

B. Steam is admitted at boiler pressure and exhausted at condenser pressure

C. The expansion (or compression) of the steam is hyperbolic

D. All of the above

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4

In designing air preheaters, the important design consideration is that

A. Approach temperature should be as low as possible

B. Handling and maintenance should be easier

C. Heat transfer area should be optimum

D. Stack gases should not be cooled to the dew point

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4

In water wall furnace, the heat is transferred to the water walls by

A. Convection

B. Radiation

C. Conduction

D. Radiation and conduction

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4

Feed water conditioning in thermal power plants in done to

A. Reduce hardness and for removal of solids

B. Increase efficiency of thermal power plant

C. Increase heat transfer rate

D. Increase steam parameters

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4

The draught in locomotive boilers is produced by a

A. Chimney

B. Centrifugal fan

C. Steam jet

D. None of these

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4

Lancashire boiler is of

A. Stationary < fire tube type

B. Horizontal type

C. Natural circulation type

D. All of the above

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The steam leaves the nozzle at a

A. High pressure and a low velocity

B. High pressure and a high velocity

C. Low pressure and a low velocity

D. Low pressure and a high velocity

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Water and sediment in fuel oil can be removed by

A. Heating the oil in the settling tanks

B. Cooling the oil in the settling tanks

C. Burning the oil

D. Suspension

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4

Expansion ratio is the ratio of

A. Swept volume to the volume at cut-off

B. Clearance volume to the swept volume

C. Volume at cut-off to the swept volume

D. Swept volume to the clearance volume

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4

Clearance ratio is the ratio of

A. Clearance volume to the swept volume

B. Clearance volume to the volume at cut-off

C. Volume at cut-off to the swept volume

D. Swept volume to the clearance volume

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4

The function of a piston in a steam engine is

A. To guide motion of the piston rod and to prevent it from bending

B. To transfer motion from the piston to the crosshead

C. To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

D. None of these

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4

The process of draining steam from the turbine, at certain points during its expansion and using this steam for heating the feed water in feed water heaters and then supplying it to the boiler is known as

A. Regenerative heating

B. Reheating of steam

C. Bleeding

D. None of these

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The friction in the nozzle __________ exit velocity of steam.

A. Has no effect on

B. Decreases

C. Increases

D. None of these

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The cylindrical shell of a Lancashire boiler has diameter from

A. 1 to 2 m

B. 1.25 to 2.25 m

C. 1.5 to 2.5 m

D. 1.75 to 2.75 m

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Bomb calorimeter is used to determine

A. Higher calorific value at constant volume

B. Lower calorific value at constant volume

C. Higher calorific value at constant pressure

D. Lower calorific value at constant pressure

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The fire tubes in a Cochran boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

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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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The ratio of total useful heat drop to the total isentropic heat drop, is called

A. Stage efficiency

B. Internal efficiency

C. Rankine efficiency

D. None of these

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4

In natural 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

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The friction present between the steam and the nozzle surfaces reduces the heat drop by

A. 10 to 15 %

B. 15 to 25 %

C. 25 to 40 %

D. 40 to 60 %

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Thermal equilibrium means that the flow of steam is

A. Isothermal

B. Isentropic

C. Hyperbolic

D. Polytropic

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The air pressure at the fuel bed is reduced below that of atmosphere by means of a fan placed at or near the bottom of the chimney to produce a draught. Such a draught is called

A. Natural draught

B. Induced draught

C. Forced draught

D. Balanced draught