Over fire burning is the phenomenon of

Question

Over fire burning is the phenomenon of

A. Supply of excess, air

B. Supply of excess coal

C. Burning CO and unburnts in upper zone of furnace by supplying more air

D. Fuel bed firing

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The shell diameter and length of locomotive boiler are

A. 1.5 m, 4 m

B. 1.5 m, 6 m

C. 1 m, 4 m

D. 2 m, 4 m

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The crown of the fire box is made hemispherical in order to

A. Give maximum space

B. Give maximum strength

C. Withstand pressure inside boiler

D. Resist intense heat in fire box

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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 number of flue tubes in Lancashire boiler is

A. Zero

B. One

C. Two

D. Four

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If partial pressure of air and steam be p_a and p_s respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

A. p_s - p_a

B. p_a - p_s

C. p_a + p_s

D. None of these

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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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De-Laval turbine is a

A. Single rotor impulse turbine

B. Multi-rotor impulse turbine

C. Impulse reaction turbine

D. None of these

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In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

A. 3.3 bar

B. 5.46 bar

C. 8.2 bar

D. 9.9 bar

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The ratio of the volume at cut-off to the swept volume is called

A. Cut-off ratio

B. Expansion ratio

C. Clearance ratio

D. None of these

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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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In water tube boilers

A. Water passes through the tubes which are surrounded by flames and hot gases

B. The flames and hot gases pass through the tubes which are surrounded by water

C. Forced circulation takes place

D. None of these

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A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

A. Supplied by same manufacturer loose and assembled at site

B. Supplied mounted on a single base

C. Purchased from several parties and packed together at site

D. Packaged boiler does not exist

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The object of producing draught in a boiler is

A. To provide an adequate supply of air for the fuel combustion

B. To exhaust the gases of combustion from the combustion chamber

C. To discharge the gases of combustion to the atmosphere through the chimney

D. All of the above

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Secondary air is the air used to

A. Provide air around burners for obtaining optimum combustion

B. Transport and dry the coal

C. Convert CO (formed in lower zone of furnace) into CO₂ at higher zone

D. Air delivered by induced draft fan

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The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

A. Equivalent evaporation

B. Factor of evaporation

C. Boiler efficiency

D. Power of a boiler

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The efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

A. V_b = 0.5 V cosα

B. V_b = V cosα

C. V_b = 0.5 V² cosα

D. V_b = V² cosα

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Hygrometry deals with the

A. Hygroscopic substances

B. Water vapour in air

C. Temperature of air

D. Pressure of air

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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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Latent heat of dry steam at atmospheric pressure is equal to

A. 539 kcal/ kg

B. 539 BTU/ lb

C. 427 kcal/ kg

D. 100 kcal/ kg

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A condenser in a steam power plant

A. Increases expansion ratio of steam

B. Reduces back pressure of steam

C. Reduces temperature of exhaust steam

D. All of these

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An air preheater

A. Increases evaporative capacity of the boiler

B. Increases the efficiency of the boiler

C. Enables low grade fuel to be burnt

D. All of the above

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Fire tube boilers are limited to a maximum working pressure of

A. 0.17 MN/m²

B. 1.7 MN/m²

C. 17 MN/m²

D. 170 MN/m²

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For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

A. Equal to

B. Twice

C. Three times

D. Four times

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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

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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

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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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At which pressure the properties of water and steam become identical

A. 0.1 kg/cm²

B. 1 kg/cm²

C. 100 kg/cm²

D. 225.6 kg/cm²

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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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Cochran boiler is a

A. Horizontal fire tube boiler

B. Horizontal water tube boiler

C. Vertical water tube boiler

D. Vertical fire tube boiler

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The maximum efficiency of a reaction turbine is

A. 2 sin²α/(1 + sin²α)

B. 2 cos²α/(1 + cos²α)

C. (1 + sin²α)/2 sin²α

D. (1 + cos²α)/2 cos²α

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Accepted Answer

C. Burning CO and unburnts in upper zone of furnace by supplying more air

Over fire burning is the phenomenon of

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

The shell diameter and length of locomotive boiler are

The crown of the fire box is made hemispherical in order to

A wet vapour can be completely specified by

The number of flue tubes in Lancashire boiler is

If partial pressure of air and steam be p_a and p_s respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

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

De-Laval turbine is a

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

The ratio of the volume at cut-off to the swept volume is called

The main object of a boiler trial is

In water tube boilers

A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

The object of producing draught in a boiler is

Secondary air is the air used to

The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

The efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Hygrometry deals with the

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

Latent heat of dry steam at atmospheric pressure is equal to

A condenser in a steam power plant

An air preheater

Fire tube boilers are limited to a maximum working pressure of

For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

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)

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

The variation of steam pressure in the nozzle depends upon

At which pressure the properties of water and steam become identical

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

Cochran boiler is a

The maximum efficiency of a reaction turbine is

Also checkout

Over fire burning is the phenomenon of

Correct Answer :

Show all Steam Boilers, Engines, Nozzles & Turbines MCQ

Related Questions

The shell diameter and length of locomotive boiler are

The crown of the fire box is made hemispherical in order to

A wet vapour can be completely specified by

The number of flue tubes in Lancashire boiler is

If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

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

De-Laval turbine is a

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

The ratio of the volume at cut-off to the swept volume is called

The main object of a boiler trial is

In water tube boilers

A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

The object of producing draught in a boiler is

Secondary air is the air used to

The ratio of heat actually used in producing the steam to the heat liberated in the furnace, is known as

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

Hygrometry deals with the

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

Latent heat of dry steam at atmospheric pressure is equal to

A condenser in a steam power plant

An air preheater

Fire tube boilers are limited to a maximum working pressure of

For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

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)

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

The variation of steam pressure in the nozzle depends upon

At which pressure the properties of water and steam become identical

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

Cochran boiler is a

The maximum efficiency of a reaction turbine is

Also checkout

If partial pressure of air and steam be p_a and p_s respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

The efficiency of an impulse turbine is maximum when (where V_b = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

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)