When the total heat of steam is h kJ/kg and the sensible heat of feed water is h_f1 kJ/kg, then the factor of evaporation is given by

Question

When the total heat of steam is h kJ/kg and the sensible heat of feed water is h_f1 kJ/kg, then the factor of evaporation is given by

A. (h - h_f1)/2257

B. (h + h_f1)/2257

C. (h × h_f1)/2257

D. None of these

Share this question with your friends

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Comment

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

Discuss this answer

The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

A. Wet

B. Superheated

C. Remain dry saturated

D. Dry

Discuss this answer

In an impulse turbine

A. The steam is expanded in nozzles only and there is a pressure drop and heat drop

B. The steam is expanded both in fixed and moving blades continuously

C. The steam is expanded in moving blades only

D. The pressure and temperature of steam remains constant

Discuss this answer

Lancashire boiler has __________ internal flue tubes.

A. One

B. Two

C. Three

D. Four

Discuss this answer

The capacity of induced draft fan compared to forced draft fan in a boiler is

A. Same

B. More

C. Less

D. Less or more depending on size of boiler

Discuss this answer

A wet vapour can be completely specified by

A. Pressure only

B. Temperature only

C. Dryness fraction only

D. Pressure and dryness fraction

Discuss this answer

Which of the following is a fire tube boiler?

A. Locomotive boiler

B. Babcock and Wilcox boiler

C. Stirling boiler

D. All of the above

Discuss this answer

A fusible plug is fitted in small boilers in order to

A. Avoid excessive build up of pressure

B. Avoid explosion

C. Extinguish fire if water level in the boiler falls below alarming limit

D. Control steam dome

Discuss this answer

Steam in water tube boiler as compared to fire tube boiler

A. Can be raised rapidly

B. Is raised at slower rate

C. Is raised at same rate

D. Could be raised at fast/slow rate depending on design

Discuss this answer

Lancashire boiler is

A. Stationary fire tube boiler

B. Internally fired boiler

C. Horizontal boiler

D. All of these

Discuss this answer

The diameter of Cornish boiler is of the order of

A. 12 m

B. 1.52.5 m

C. 23 m

D. 2.53.5 m

Discuss this answer

Hard coke is used in

A. Cement industry

B. Thermal power plant

C. Blast furnace

D. Domestic use

Discuss this answer

The steam temperature with increase in load in case of a boiler fitted with radiation superheater

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

Discuss this answer

The shell of the Cochran boiler is made hemispherical

A. To give maximum space and strength

B. To withstand the pressure of steam inside the boiler

C. Both (A) and (B)

D. None of the above

Discuss this answer

Which of the following boiler works on a forced circulation of water?

A. Lamont boiler

B. Benson boiler

C. Loeffler boiler

D. All of these

Discuss this answer

Which type of boiler can meet rapid changes of load?

A. Vertical fire tube type

B. Horizontal fire tube type

C. Horizontal water tube type

D. Forced circulation type

Discuss this answer

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

Discuss this answer

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and h_d = Enthalpy or heat drop during expansion of steam in a nozzle)

A. V = 44.72 h_d K

B. V = 44.72 K h_d

C. V = 44.72 K h_d

D. V = 44.72 K h_d

Discuss this answer

Incomplete combustion can be best judged by

A. Smoky chimney exit

B. Excess air in flue gases

C. Measuring carbon monoxide in flue gases

D. Measuring temperature of flue gases at exit of furnace

Discuss this answer

A boiler in India should conform to safety regulations of

A. DIN

B. BS

C. ASTM

D. IBR

Discuss this answer

Pour point of fuel oil is the

A. Lowest temperature at which oil will flow under set condition

B. Storage temperature

C. Temperature at which fuel is pumped through burners

D. Temperature at which oil is transported

Discuss this answer

Which is not correct statement about effect of sulphur in fuel?

A. It has heating value

B. It helps in electrostatic precipitation of ash in flue gases

C. It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

D. It erodes furnace walls

Discuss this answer

Benson boiler requires

A. No drum

B. One drum

C. Two drums

D. Three drums

Discuss this answer

Spontaneous combustion is a phenomenon in which

A. All the fuel burns instantaneously producing high energy release

B. Fuel burns with less air

C. 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

D. Explosion in furnace

Discuss this answer

In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

A. Lancashire boiler

B. Locomotive boiler

C. Babcock and Wilcox boiler

D. Benson boiler

Discuss this answer

The value of diagram factor depends upon

A. Initial conditions of steam

B. Back pressure

C. Initial pressure of steam

D. All of these

Discuss this answer

The flow of steam is supersonic

A. At the entrance to the nozzle

B. At the throat of the nozzle

C. In the convergent portion of the nozzle

D. In the divergent portion of the nozzle

Discuss this answer

In a nozzle, whole frictional loss is assumed to occur between

A. Inlet and throat

B. Inlet and outlet

C. Throat and exit

D. All of these

Discuss this answer

The pressure of steam __________ while flowing through a nozzle.

A. Increases

B. Decreases

C. Remains constant

D. None of these

Discuss this answer

The cylinder condensation or missing quantity may be reduced by

A. The efficient steam jacketing of the cylinder walls

B. Superheating the steam supplied to the engine cylinder

C. Keeping the expansion ratio small in each cylinder

D. All of the above

Discuss this answer

Accepted Answer

A. (h - h_f1)/2257

When the total heat of steam is h kJ/kg and the sensible heat of feed water is h_f1 kJ/kg, then the factor of evaporation is given by

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

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

The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

In an impulse turbine

Lancashire boiler has __________ internal flue tubes.

The capacity of induced draft fan compared to forced draft fan in a boiler is

A wet vapour can be completely specified by

Which of the following is a fire tube boiler?

A fusible plug is fitted in small boilers in order to

Steam in water tube boiler as compared to fire tube boiler

Lancashire boiler is

The diameter of Cornish boiler is of the order of

Hard coke is used in

The steam temperature with increase in load in case of a boiler fitted with radiation superheater

The shell of the Cochran boiler is made hemispherical

Which of the following boiler works on a forced circulation of water?

Which type of boiler can meet rapid changes of load?

Clearance ratio is the ratio of

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and h_d = Enthalpy or heat drop during expansion of steam in a nozzle)

Incomplete combustion can be best judged by

A boiler in India should conform to safety regulations of

Pour point of fuel oil is the

Which is not correct statement about effect of sulphur in fuel?

Benson boiler requires

Spontaneous combustion is a phenomenon in which

In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

The value of diagram factor depends upon

The flow of steam is supersonic

In a nozzle, whole frictional loss is assumed to occur between

The pressure of steam __________ while flowing through a nozzle.

The cylinder condensation or missing quantity may be reduced by

Also checkout

When the total heat of steam is h kJ/kg and the sensible heat of feed water is hf1 kJ/kg, then the factor of evaporation is given by

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

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

The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become

In an impulse turbine

Lancashire boiler has __________ internal flue tubes.

The capacity of induced draft fan compared to forced draft fan in a boiler is

A wet vapour can be completely specified by

Which of the following is a fire tube boiler?

A fusible plug is fitted in small boilers in order to

Steam in water tube boiler as compared to fire tube boiler

Lancashire boiler is

The diameter of Cornish boiler is of the order of

Hard coke is used in

The steam temperature with increase in load in case of a boiler fitted with radiation superheater

The shell of the Cochran boiler is made hemispherical

Which of the following boiler works on a forced circulation of water?

Which type of boiler can meet rapid changes of load?

Clearance ratio is the ratio of

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and hd = Enthalpy or heat drop during expansion of steam in a nozzle)

Incomplete combustion can be best judged by

A boiler in India should conform to safety regulations of

Pour point of fuel oil is the

Which is not correct statement about effect of sulphur in fuel?

Benson boiler requires

Spontaneous combustion is a phenomenon in which

In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

The value of diagram factor depends upon

The flow of steam is supersonic

In a nozzle, whole frictional loss is assumed to occur between

The pressure of steam __________ while flowing through a nozzle.

The cylinder condensation or missing quantity may be reduced by

Also checkout

When the total heat of steam is h kJ/kg and the sensible heat of feed water is h_f1 kJ/kg, then the factor of evaporation is given by

The velocity of steam leaving the nozzle (V) is given by (where K = Nozzle coefficient or nozzle efficiency, and h_d = Enthalpy or heat drop during expansion of steam in a nozzle)