Foaming is caused by the formation of ___________ a) Acids b) Alcohols c) Oils and alkalis d) Ketones

Foaming is caused by the formation of ___________
a) Acids
b) Alcohols
c) Oils and alkalis
d) Ketones
by

1 Answer

Answer :

c) Oils and alkalis
by

Related questions

The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement

Description : The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement

Last Answer : d) Caustic embrittlement

The propulsion of water into steam drum by extremely rapid, almost explosive boiling of water at the heating surface is called ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement

Description : The propulsion of water into steam drum by extremely rapid, almost explosive boiling of water at the heating surface is called ___________ a) Foaming b) Priming c) Corrosion d) Caustic embrittlement

Last Answer : b) Priming

Which of the following is not a result of the excess of impurity in boiler-feed. a) Scale and sludge formation b) Decomposition c) Corrosion, priming and foaming d) Caustic embrittlement

Description : Which of the following is not a result of the excess of impurity in boiler-feed. a) Scale and sludge formation b) Decomposition c) Corrosion, priming and foaming d) Caustic embrittlement

Last Answer : b) Decomposition

Aldehydes undergo oxidation with KMnO4/H+ to give (a) Alcohols (b) Acetals (c) Ketones (d) Acids

Description : Aldehydes undergo oxidation with KMnO4/H+ to give (a) Alcohols (b) Acetals (c) Ketones (d) Acids

Last Answer : Acids

The draught in locomotive boilers is produced by a ___________ a) Chimney b) Centrifugal fan c) Steam jet d) All of the above

Description : The draught in locomotive boilers is produced by a ___________ a) Chimney b) Centrifugal fan c) Steam jet d) All of the above

Last Answer : c) Steam jet

What is the main disadvantage of Lamont boiler ? a. Less flexible in design b. Low heat transfer rate c. Formation of bubbles d. Low steam generation capacity

Description : What is the main disadvantage of Lamont boiler ? a. Less flexible in design b. Low heat transfer rate c. Formation of bubbles d. Low steam generation capacity

Last Answer : c. Formation of bubbles

The biggest loss in the boiler is a) Moisture in fuel b) Dry flue gases c) Steam formation d) Unburnt carbon

Description : The biggest loss in the boiler is a) Moisture in fuel b) Dry flue gases c) Steam formation d) Unburnt carbon

Last Answer : b) Dry flue gases

Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or thermosetting (C) Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

Description : Pick out the wrong statement. (A) Linear polymers are formed from bifunctional groups only and are normally thermoplastic (B) Cross-linked branched chain polymers are either elastometric or ... (D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

Last Answer : D) Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction

Why there is no suitable indicator of mild acids and mild alkalis ?

Description : Why there is no suitable indicator of mild acids and mild alkalis ?

Last Answer : When the mild alkali solution is added to the mild acid solution drop by drop, the pH value of the solution gradually increases. In this case, even if it comes close to the quenching point, no sudden ... is used. So it can be said that there is no suitable indicator of mild acids and mild alkalis.

Why Concentrated Acids and Alkalis Are Dangerous ?

Description : Why Concentrated Acids and Alkalis Are Dangerous ?

Last Answer : Answer : The value of Ph in alkali is less than 3 and the value of Ph in alkali is more than 7 . But the value of Ph for skin is 5.5 - 6.5 . So it is dangerous.

Unconjugated bilirubin in serum is soluble in (A) Water (B) Alkalis (C) Acids (D) Methanal

Description : Unconjugated bilirubin in serum is soluble in (A) Water (B) Alkalis (C) Acids (D) Methanal

Last Answer : Answer : D

Hastelloy C is a good material of construction in chemical process industry, since it is (A) Highly corrosion resistant and is readily fabricated (B) Relatively inexpensive although it can be fabricated with some difficulty (C) Corrosion resistant to most alkalis, particularly because of its copper content (D) Light and resists attack by acids

Description : Hastelloy C is a good material of construction in chemical process industry, since it is (A) Highly corrosion resistant and is readily fabricated (B) Relatively inexpensive although it can be ... most alkalis, particularly because of its copper content (D) Light and resists attack by acids

Last Answer : (D) Light and resists attack by acids

Which of the following statements is correct? (a) Sporopollenin can be degraded by enzymes. (b) Sporopollenin is made up of inorganic materials. (c) Sporopollenin can withstand high temperatures as well as strong acids and alkalis. (d) Sporopollenin can withstand high temperatures but not strong acids.

Description : Which of the following statements is correct? (a) Sporopollenin can be degraded by enzymes. (b) Sporopollenin is made up of inorganic materials. (c) Sporopollenin can withstand high temperatures ... strong acids and alkalis. (d) Sporopollenin can withstand high temperatures but not strong acids.

Last Answer : (c) Sporopollenin can withstand high temperatures as well as strong acids and alkalis

Where is water steam separator drum located in Lamont boiler ? a. Inside of the boiler b. Right above the furnace c. Before the feed water pump d. Outside the boiler

Description : Where is water steam separator drum located in Lamont boiler ? a. Inside of the boiler b. Right above the furnace c. Before the feed water pump d. Outside the boiler

Last Answer : d. Outside the boiler

What type of steam is generated by evaporator tube of Lamont boiler ? a. Saturated steam b. Unsaturated steam c. Superheated steam d. Flash steam

Description : What type of steam is generated by evaporator tube of Lamont boiler ? a. Saturated steam b. Unsaturated steam c. Superheated steam d. Flash steam

Last Answer : a. Saturated steam

In which year was Lamont boiler invented? a. 1905 b. 1910 c. 1920 d. 1925

Description : In which year was Lamont boiler invented? a. 1905 b. 1910 c. 1920 d. 1925

Last Answer : d. 1925

What is the pressure range between which Lamont boiler operator ? a. 80-120 bar b. 120-160 bar c. 180-360 bar d. 450-560 bar

Description : What is the pressure range between which Lamont boiler operator ? a. 80-120 bar b. 120-160 bar c. 180-360 bar d. 450-560 bar

Last Answer : b. 120-160 bar

Through which does the even circulation of water is possible in Lamont boiler ? a. Nozzles b. Water trough c. Feed pump d. Hose

Description : Through which does the even circulation of water is possible in Lamont boiler ? a. Nozzles b. Water trough c. Feed pump d. Hose

Last Answer : a. Nozzles

In what form are the boiler tube arrange in Lamont boiler ? a. Parallel in vertical b. Inclined vertically c. Parallel in horizontal d. Horizontally inclined

Description : In what form are the boiler tube arrange in Lamont boiler ? a. Parallel in vertical b. Inclined vertically c. Parallel in horizontal d. Horizontally inclined

Last Answer : c. Parallel in horizontal

Through what is feed water from hot-well is passed through, before entering steam and water drum in Lamont boiler? a. Evaporator tubes b. Economizer c. Distributor header d. Circulating pump

Description : Through what is feed water from hot-well is passed through, before entering steam and water drum in Lamont boiler? a. Evaporator tubes b. Economizer c. Distributor header d. Circulating pump

Last Answer : b. Economizer

What is called as the heart of the Lamont boiler? a. Water drum b. Centrifugal pump c. Furnace d. Blower

Description : What is called as the heart of the Lamont boiler? a. Water drum b. Centrifugal pump c. Furnace d. Blower

Last Answer : b. Centrifugal pump

Type of Lamont boiler is_______ a. Forced circulation b. Natural circulation c. Over-through d. Positive forced circulation

Description : Type of Lamont boiler is_______ a. Forced circulation b. Natural circulation c. Over-through d. Positive forced circulation

Last Answer : a. Forced circulation

Boilers are used in places like 1. Domestic heating 2. Commercial heating 3. Industrial heating application 4. All of above

Description : Boilers are used in places like 1. Domestic heating 2. Commercial heating 3. Industrial heating application 4. All of above

Last Answer : 4. All of above

Combustion of which fuels from following is source of heat for boiler 1. Wood 2. Coal 3. Oil 4. All of above

Description : Combustion of which fuels from following is source of heat for boiler 1. Wood 2. Coal 3. Oil 4. All of above

Last Answer : 4. All of above

Boiler works from application of which type of energies 1. Fuel combustion 2. Electricity 3. Nuclear energy 4. All of above

Description : Boiler works from application of which type of energies 1. Fuel combustion 2. Electricity 3. Nuclear energy 4. All of above

Last Answer : 4. All of above

High pressure boilers operate at 1. Lower than 15 psig 2. Higher than 15 psig 3. 15 psig 4. None of above

Description : High pressure boilers operate at 1. Lower than 15 psig 2. Higher than 15 psig 3. 15 psig 4. None of above

Last Answer : 2. Higher than 15 psig

Boiler is a enclosed vessel that provides a) Expansion b) Ignition c) Combustion d) None of the above

Description : Boiler is a enclosed vessel that provides a) Expansion b) Ignition c) Combustion d) None of the above

Last Answer : c) Combustion

Which of the following option is incorrect about the sludges? a) Sludges are soft, loose and slimy precipitate b) They are non-adherent deposits and can be easily removed c) Formed generally at heated portions of the boiler d) Can be removed by blow down operation

Description : Which of the following option is incorrect about the sludges? a) Sludges are soft, loose and slimy precipitate b) They are non-adherent deposits and can be easily removed c) Formed generally at heated portions of the boiler d) Can be removed by blow down operation

Last Answer : c) Formed generally at heated portions of the boiler

If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hard and adhering on the inner wall, it is called _____________ a) Sludges, scale b) Scale, sludges c) Sludges, rodent d) Scale, rodent

Description : If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hard and adhering on the inner wall, it is called _____________ a) Sludges, scale b) Scale, sludges c) Sludges, rodent d) Scale, rodent

Last Answer : a) Sludges, scale

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°

Description : 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°

Last Answer : (B) 90°

The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be (A) 0.4 (B) 0.56 (C) 0.67 (D) 1.67

Description : The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be (A) 0.4 (B) 0.56 (C) 0.67 (D) 1.67

Last Answer : (A) 0.4

Find false 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

Description : Find false 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

Last Answer : (D) It erodes furnace walls

In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is (A) 0.007 bar (B) 0.053 bar (C) 0.06 bar (D) 0.067 bar

Description : In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is (A) 0.007 bar (B) 0.053 bar (C) 0.06 bar (D) 0.067 bar

Last Answer : (D) 0.067 bar

Presence of moisture in fuel oil would (A) Keep the burner tips cool (B) Aid in proper combustion (C) Because sputtering, possibly extinguishing flame (D) Clean the nozzles

Description : Presence of moisture in fuel oil would (A) Keep the burner tips cool (B) Aid in proper combustion (C) Because sputtering, possibly extinguishing flame (D) Clean the nozzles

Last Answer : (D) Clean the nozzles

Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process

Description : Adiabatic process is (A) Essentially an isentropic process is___________ (B) Non-heat transfer process (C) Reversible process (D) Constant temperature process

Last Answer : (B) Non-heat transfer process

The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure. (A) Equal to (B) Less than (C) Higher than (D) None of these

Description : The pressure of steam in the engine cylinder at the beginning of the stroke is ________ the boiler pressure. (A) Equal to (B) Less than (C) Higher than (D) None of these

Last Answer : (B) Less than

The relative heat absorption for successively added equal areas of boiler convection heating surfaces__________ (A) Increases (B) Decreases (C) Remain unaffected (D) First increases and then decreases

Description : The relative heat absorption for successively added equal areas of boiler convection heating surfaces__________ (A) Increases (B) Decreases (C) Remain unaffected (D) First increases and then decreases

Last Answer : (B) Decreases

A safety valve usually employed with stationary boilers is (A) Lever safety valve (B) Dead weight safety valve (C) High steam and low water safety valve (D) All of these

Description : A safety valve usually employed with stationary boilers is (A) Lever safety valve (B) Dead weight safety valve (C) High steam and low water safety valve (D) All of these

Last Answer : (D) All of these

Green coal, in order to be burnt, must be (A) Heated sufficiently (B) Burnt in excess air (C) Heated to its ignition point (D) Burnt as powder

Description : Green coal, in order to be burnt, must be (A) Heated sufficiently (B) Burnt in excess air (C) Heated to its ignition point (D) Burnt as powder

Last Answer : (C) Heated to its ignition point

Combustion is the ideal air/fuel ratio where a. the mixing proportion is correct, b. the fuel is completely burned c. the oxygen is entirely consumed d. All of the above

Description : Combustion is the ideal air/fuel ratio where a. the mixing proportion is correct, b. the fuel is completely burned c. the oxygen is entirely consumed d. All of the above

Last Answer : d. All of the above

Based on the exhaust gas analysis, a controller maintains stoichiometric combustion __ a. by commanding a servo motor to adjust the combustion air damper b. By commanding servo motor to adjust the fuel supply valve. c. Both a. & b. d. None of the above.

Description : Based on the exhaust gas analysis, a controller maintains stoichiometric combustion __ a. by commanding a servo motor to adjust the combustion air damper b. By commanding servo motor to adjust the fuel supply valve. c. Both a. & b. d. None of the above.

Last Answer : c. Both a. & b.

Detecting and monitoring carbon monoxide assures the air/fuel ratio is not too rich as a. The excess air is trimmed b. Excess air is let out c. Both a. & b. d. None of above

Description : Detecting and monitoring carbon monoxide assures the air/fuel ratio is not too rich as a. The excess air is trimmed b. Excess air is let out c. Both a. & b. d. None of above

Last Answer : a. The excess air is trimmed

It is easy to detect and monitor excess air a. As oxygen not used for combustion is heated and discharged with the exhaust gases. b. Oxygen is discharged without heating c. Both a. & b. d. None of above

Description : It is easy to detect and monitor excess air a. As oxygen not used for combustion is heated and discharged with the exhaust gases. b. Oxygen is discharged without heating c. Both a. & b. d. None of above

Last Answer : a. As oxygen not used for combustion is heated and discharged with the exhaust gases.

Oxygen trim control strategy __ a. continuously measures the oxygen content in the flue gas b. adjusts the combustion air flow c. Continually tuning the air-fuel mixture. d. All of above

Description : Oxygen trim control strategy __ a. continuously measures the oxygen content in the flue gas b. adjusts the combustion air flow c. Continually tuning the air-fuel mixture. d. All of above

Last Answer : d. All of above

Use of ______ is prohibited in process boilers. a. Use of a common gas b. combustion air control linkage c. jack shaft d. All of the above

Description : Use of ______ is prohibited in process boilers. a. Use of a common gas b. combustion air control linkage c. jack shaft d. All of the above

Last Answer : d. All of the above

For process boilers , combustion air fans must meet the following requirements ___ a. The fan motor shall be driven by a variable speed drive b. The fan motor shall include controls that limit the fan motor demand to no more than 30 %. c. Both a. & b. d. None of the above

Description : For process boilers , combustion air fans must meet the following requirements ___ a. The fan motor shall be driven by a variable speed drive b. The fan motor shall include controls that limit the fan motor demand to no more than 30 %. c. Both a. & b. d. None of the above

Last Answer : c. Both a. & b.

A flue damper and a vent damper are two examples of _______ a. Combustion air positive shut off devices b. Combustion air negative shut off devices c. Both a. & b. d. None of the above

Description : A flue damper and a vent damper are two examples of _______ a. Combustion air positive shut off devices b. Combustion air negative shut off devices c. Both a. & b. d. None of the above

Last Answer : a. Combustion air positive shut off devices

Process boilers with capacity of 2.5 MMBtu/h and above are also referred as _ a. Natural draft boilers b. Atmospheric boilers c. Both a. And b. d. None of the above

Description : Process boilers with capacity of 2.5 MMBtu/h and above are also referred as _ a. Natural draft boilers b. Atmospheric boilers c. Both a. And b. d. None of the above

Last Answer : a. Natural draft boilers

Combustion air positive shut-off shall be provided on all newly installed _______ a. Grant boilers b. Process boilers c. Worcester boilers d. All of the above

Description : Combustion air positive shut-off shall be provided on all newly installed _______ a. Grant boilers b. Process boilers c. Worcester boilers d. All of the above

Last Answer : b. Process boilers

If steam is pressurized _____ • It occupies more space • It occupies less space • Both are correct • None of the above

Description : If steam is pressurized _____ • It occupies more space • It occupies less space • Both are correct • None of the above

Last Answer : • It occupies less space