Differentiate induced draft and forced draft cooling towers based on (i) Location of fan (ii) Corrosion of blades (iii) Efficiency (iv) Fan size

Differentiate induced draft and forced draft cooling towers based on (i) Location of fan (ii) Corrosion of blades (iii) Efficiency (iv) Fan size
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Differentiate induced draft and forced draft cooling towers based on (i) Location of fan (ii) Corrosion of blades (iii) Efficiency (iv) Fan size

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Pick out the wrong statement pertaining to the cooling towers. (A) In case of induced draft cooling tower, the fan is placed at the top of the tower (B) Effectiveness of forced draft cooling tower is reduced by the recirculation of the humid and hot discharged air (C) A natural draft cooling tower is recommended to be used, when the air humidity is low and air temperature is also low (D) Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

Description : Pick out the wrong statement pertaining to the cooling towers. (A) In case of induced draft cooling tower, the fan is placed at the top of the tower (B) Effectiveness of ... Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

Last Answer : (D) Effectiveness of a mechanical draft cooling tower is reduced with increase in air wet-bulb temperature

In a furnace employing forced draught as compared to induced draught, (A) Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced (B) The fan operates hot and hence blades are liable to corrosion and erosion (C) Positive pressure exists in the furnace (D) None of these

Description : In a furnace employing forced draught as compared to induced draught, (A) Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced (B) The fan operates hot and hence blades are liable to corrosion and erosion (C) Positive pressure exists in the furnace (D) None of these

Last Answer : (C) Positive pressure exists in the furnace

Define Forced Draft And Induced Draft Cooling Towers?

Description : Define Forced Draft And Induced Draft Cooling Towers?

Last Answer : If the fan is located at the bottom of the tower and air is blown by the fan up through the descending water it is called as forced draft cooling towers. If the fan is located at the top of the ... on the tower's side and drawn up and discharge through the fan casing, it is called as induced draft.

Describe with neat sketch working of natural draft cooling towers.

Description : Describe with neat sketch working of natural draft cooling towers.

Last Answer : Natural draft cooling tower: -In natural draught cooling tower, the circulation of air is produced by the pressure difference of air inside the tower and outside atmospheric air Hot cooling water falls down ... the pressure difference of air inside and outside of cooling tower (natural flow).

Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? (A) Ash disposal problem (B) Excessive fly ash discharge from the stack (C) Higher power consumption in its transportation (D) Erosion of induced draft fan blades

Description : Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? (A) Ash disposal problem (B) Excessive fly ash discharge from the stack (C) Higher power consumption in its transportation (D) Erosion of induced draft fan blades

Last Answer : (A) Ash disposal problem

Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? (A) Ash disposal problem (B) Excessive fly-ash discharge from the stack (C) High power consumption in its transportation (D) Erosion of induced draft fan blades

Description : Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing? (A) Ash disposal problem (B) Excessive fly-ash discharge from the stack (C) High power consumption in its transportation (D) Erosion of induced draft fan blades

Last Answer : (A) Ash disposal problem

Flue gas from the heating chamber of byproduct coke ovens is removed by (A) Forced draft fan (B) Induced draft fan (C) Steam ejector (D) Natural draft

Description : Flue gas from the heating chamber of byproduct coke ovens is removed by (A) Forced draft fan (B) Induced draft fan (C) Steam ejector (D) Natural draft

Last Answer : (D) Natural draft

When the temperature and humidity of air is low, we usually use __________ draft cooling tower. (A) Natural (B) Forced (C) Induced (D) None of these

Description : When the temperature and humidity of air is low, we usually use __________ draft cooling tower. (A) Natural (B) Forced (C) Induced (D) None of these

Last Answer : (A) Natural

The most efficient cooling tower out of the following is (A) Induced draft (B) Forced draft (C) Natural draft (D) Atmospheric

Description : The most efficient cooling tower out of the following is (A) Induced draft (B) Forced draft (C) Natural draft (D) Atmospheric

Last Answer : (A) Induced draft

What Are The Advantages Of Induced Draft Cooling Tower Over Forced Draft Cooling Tower?

Description : What Are The Advantages Of Induced Draft Cooling Tower Over Forced Draft Cooling Tower?

Last Answer : 1. The outlet water comes in contact with the driest air and warmest water comes in contact with most humid air. 2. The re-circulation is seldom a problem. 3. The first cost is low due to the reduction in pump power consumption.

. Improved cooling efficiency and minimum usage of material are the key features of ______ a. Natural draft cooling towers b. Cross flow towers c. Hyperbolic cooling d. All of above

Description : . Improved cooling efficiency and minimum usage of material are the key features of ______ a. Natural draft cooling towers b. Cross flow towers c. Hyperbolic cooling d. All of above

Last Answer : Hyperbolic cooling

Hyperbolic cooling towers have become design standard for all natural draft structural towers because usage of . a. Their structural strength b. Minimum usage of material. c. Improving cooling efficiency d. All of the above.

Description : Hyperbolic cooling towers have become design standard for all natural draft structural towers because usage of . a. Their structural strength b. Minimum usage of material. c. Improving cooling efficiency d. All of the above.

Last Answer : All of the above.

Natural draft in hyperbolic cooling towers reduces of fans a) Damage b) Efficiency c) Cost d) Speed

Description : Natural draft in hyperbolic cooling towers reduces of fans a) Damage b) Efficiency c) Cost d) Speed

Last Answer : c) Cost

Cooling towers are rated in terms of A. approach B. range C. both of the mentioned D. none of the mentioned

Description : Cooling towers are rated in terms of A. approach B. range C. both of the mentioned D. none of the mentioned

Last Answer : ANSWER :C

Supercharging is the process of a. supplying the engine with air at a density greater than the density of the surrounding atmosphere b. providing forced cooling air c. injecting excess fuel d. raising the exhaust pressure

Description : Supercharging is the process of a. supplying the engine with air at a density greater than the density of the surrounding atmosphere b. providing forced cooling air c. injecting excess fuel d. raising the exhaust pressure

Last Answer : ANSWER a. supplying the engine with air at a density greater than the density of the surrounding atmosphere

Scavenging air in diesel engine means a. air used for combustion under pressure b. forced air for cooling the cylinder c. burnt air containing products of combustion d. air used for forcing burnt gases out of the engines cylinder during the exhaust stroke

Description : Scavenging air in diesel engine means a. air used for combustion under pressure b. forced air for cooling the cylinder c. burnt air containing products of combustion d. air used for forcing burnt gases out of the engines cylinder during the exhaust stroke

Last Answer : ANSWER d. air used for forcing burnt gases out of the engines cylinder during the exhaust stroke

Induced draft fans provided in large thermal power plant boilers have __________ blades. (A) Forward curved (B) Backward curved (C) Double curved (D) Radial or straight

Description : Induced draft fans provided in large thermal power plant boilers have __________ blades. (A) Forward curved (B) Backward curved (C) Double curved (D) Radial or straight

Last Answer : (B) Backward curved

State two factors on which efficiency of cooling tower depends.

Description : State two factors on which efficiency of cooling tower depends.

Last Answer : Efficiency of cooling tower depends on 1.Losses in duct, piping and joints, pipes should be free from scale/rust 2.Efficient heat transfer, maintenance of piping , Ensure fill is clean and free of debris. 3.Sufficient airflow and correct fan speed. 

In surface condensers write role of (i) Water tubes (ii) Shell (iii) Baffle plate (iv) Tube sheet

Description : In surface condensers write role of (i) Water tubes (ii) Shell (iii) Baffle plate (iv) Tube sheet

Last Answer : Function of parts in surface condensers 1. Water tubes- Cooling water flows through it , for convective heat transfer to occur with steam outside the tubes 2. Shell- Outer body, all components are ... and improves heat transfer 4. Tube sheet- All tubes are supported at the end in tube sheet

Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given ‘L/V’ ratio (B) The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction(C) Natural draft cooling towers are made of ferroconcrete and its cross￾section is wider at the bottom(D) Vander wall adsorption is also called chemisorption

Description : Pick out the wrong statement. (A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given L/V' ratio (B) The extraction per unit ... and its cross￾section is wider at the bottom (D) Vander wall adsorption is also called chemisorption

Last Answer : (D) Vander wall adsorption is also called chemisorption

How Mechanical Draft Cooling Towers Are Classified?

Description : How Mechanical Draft Cooling Towers Are Classified?

Last Answer : Mechanical draft cooling tower is classified into three types: 1. Forced draft tower. 2. Induced draft counterflow tower. 3. Induced draft cross flow tower.

What Are The Advantages Of Hyperbolic Natural-draft Cooling Towers?

Description : What Are The Advantages Of Hyperbolic Natural-draft Cooling Towers?

Last Answer :  Since no fans are used power cost and auxiliary equipments cost is reduced.  Hyperbolic tower chimney creates its own draft even when there is no wind.  Ground fogging and warm air re-circulation are avoided in hyperbolic towers.  The structure is more or less self-supported.

. _____ type of cooling towers are used with nuclear power plants. a. Cross flow b. Natural draft c. Hyperbolic d. None of above

Description : . _____ type of cooling towers are used with nuclear power plants. a. Cross flow b. Natural draft c. Hyperbolic d. None of above

Last Answer : Hyperbolic

Hyperbolic cooling towers are also referred as a. Natural draft towers b. Cross flow towers c. Hyperboloid towers d. None of the above

Description : Hyperbolic cooling towers are also referred as a. Natural draft towers b. Cross flow towers c. Hyperboloid towers d. None of the above

Last Answer : Hyperboloid towers

Natural draft cooling towers are mainly used in the _____. • Steel industry • Fertilizer industry • Alumina industry • Power stations

Description : Natural draft cooling towers are mainly used in the _____. • Steel industry • Fertilizer industry • Alumina industry • Power stations

Last Answer : Power stations

__________ Cooling towers have become the design standard for all natural-draft cooling towers because oftheir structural strength and minimum usage of material. • HCT • CCT • Hyperboloid • None

Description : __________ Cooling towers have become the design standard for all natural-draft cooling towers because oftheir structural strength and minimum usage of material. • HCT • CCT • Hyperboloid • None

Last Answer : Hyperboloid

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan (A) With greater number of blades (B) Of increased diameter (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan (A) With greater ... (B) Of increased diameter (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Natural Draft or Hyperbolic towers have been used for • Large Capacity of water • Small Capacity of Water • High Efficiency • Low capital cost

Description : Natural Draft or Hyperbolic towers have been used for • Large Capacity of water • Small Capacity of Water • High Efficiency • Low capital cost

Last Answer : Large Capacity of water

In centrifugal compressor terminology, vaneless space refers to the space between A. The inlet and blade inlet edge B. Blades in the impeller C. Diffuser exit and volute casing D. Impeller tip and diffuser inlet edge

Description : In centrifugal compressor terminology, vaneless space refers to the space between A. The inlet and blade inlet edge B. Blades in the impeller C. Diffuser exit and volute casing D. Impeller tip and diffuser inlet edge

Last Answer : ANSWER : D

Ingress of cold air in the furnaces through cracks, charging doors, openings etc(A) Reduces the flue gas temperature and makes the furnace atmosphereoxidising(B) Increases the load on the induced draft fan(C) Reduces the furnace draught(D) All (A), (B) and (C)

Description : Ingress of cold air in the furnaces through cracks, charging doors, openings etc (A) Reduces the flue gas temperature and makes the furnace atmosphere oxidising (B) Increases the load on the induced draft fan (C) Reduces the furnace draught (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Pick out the wrong statement. (A) Different solids have different equilibrium moisture curves (B) Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of theoretical plate calculation for distillation column (C) Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column (D) Even a forced draft cooling tower cannot cool water below the wet bulb temperature

Description : Pick out the wrong statement. (A) Different solids have different equilibrium moisture curves (B) Total condenser or reboiler is considered equivalent to one theoretical plate in McCabe-Thiele method of ... (D) Even a forced draft cooling tower cannot cool water below the wet bulb temperature

Last Answer : (C) Heat removal load on cooler remains constant, even with increase of the reflux ratio in a distillation column

In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the (A) Range is 15°F (B) Approach is 10°F (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is (A) Natural draft cooling tower (B) Induced draft cooling tower (C) Spray chamber (D) None of these

Description : The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is (A) Natural draft cooling tower (B) Induced draft cooling tower (C) Spray chamber (D) None of these

Last Answer : (C) Spray chamber

Explain the construction and working of induced draft cooling tower with neat sketch.

Description : Explain the construction and working of induced draft cooling tower with neat sketch.

Last Answer : Induced draft cooling tower :  Diagram: Construction and working: Cooling towers are employed to cool utility cooling water by direct contact with air. The parts of a cooling tower are ... top pulls the hot air through the fills and cooled water gets collected in the cold water basin.

Which of the following is used to produce draught in the locomotive boilers? (A) Chimney (B) Induced draught fan (C) Forced draught fan (D) Steam jet arrangement

Description : Which of the following is used to produce draught in the locomotive boilers? (A) Chimney (B) Induced draught fan (C) Forced draught fan (D) Steam jet arrangement

Last Answer : Option D

Why is induced draught considered better than the forced draught? a) Because power requirement is high for forced draught b) Maintenance of induced draught fan is costlier c) Forced draught is less efficient d) Forced draught produces less amount of speed of air

Description : Why is induced draught considered better than the forced draught? a) Because power requirement is high for forced draught b) Maintenance of induced draught fan is costlier c) Forced draught is less efficient d) Forced draught produces less amount of speed of air

Last Answer : Because power requirement is high for forced draught

In the natural draft cooling tower_________ is not required a) Fan b) tower c) Nozzle d) none of the above

Description : In the natural draft cooling tower_________ is not required a) Fan b) tower c) Nozzle d) none of the above

Last Answer : Fan

Write the functions of : i) Blades – ii) Nacelle – iii) Shaft – iv) Gear box –

Description : Write the functions of : i) Blades – ii) Nacelle – iii) Shaft – iv) Gear box –

Last Answer : i) Blades - Convert wind energy into usable mechanical energy. Aerodynamically optimized structure of blades help to capture maximum wind power even in normal operation. ii) Nacelle - Protects ... high speed - drives the generator. iv) Gear box - Controls rotational speed of generator.

Moisture in freon refrigeration system causes (a) ineffective refrigeration (b) high power consumption (c) freezing automatic regulating valve (d) corrosion of whole system

Description : Moisture in freon refrigeration system causes (a) ineffective refrigeration (b) high power consumption (c) freezing automatic regulating valve (d) corrosion of whole system

Last Answer : Ans: c

Differentiate between natural draught and forced draught cooling tower.

Description : Differentiate between natural draught and forced draught cooling tower.

Last Answer : Sr. No. Natural draught Forced draught 1 The air flows naturally without fan through tower and provides required cooling Fan is located at the top of the tower and enters the ... from tower cannot be controlled. The temp. of water coming out from tower can be controlled.

The maximum harbour depth below lowest low water is generally equal to (i) Loaded draft +1.2 m when bottom is rock (ii) Loaded draft +1.8 m when bottom is soft (iii) Loaded draft +1.2 m when bottom is soft (iv) Loaded draft +1.8 m when bottom is rock Of these statements (A) (i) and (ii) are correct (B) (i) and (iii) are correct (C) (ii) and (iv) are correct (D) (iii) and (iv) are correct

Description : The maximum harbour depth below lowest low water is generally equal to (i) Loaded draft +1.2 m when bottom is rock (ii) Loaded draft +1.8 m when bottom is soft (iii) Loaded draft +1.2 m when bottom is ... ) and (iii) are correct (C) (ii) and (iv) are correct (D) (iii) and (iv) are correct

Last Answer : (D) (iii) and (iv) are correct

The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid (A) Its evaporation loss (B) Excessive corrosion (C) Uneconomic LMTD (D) Decrease in heat exchanger efficiency

Description : The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid (A) Its evaporation loss (B) Excessive corrosion (C) Uneconomic LMTD (D) Decrease in heat exchanger efficiency

Last Answer : (B) Excessive corrosion

Differentiate between isothermal and isentropic processes

Description : Differentiate between isothermal and isentropic processes

Last Answer : Isothermal Vs Isentropic

The formation of frost on cooling coils in a refrigerator (a) increases heat transfer (b) improves C.O.P. of the system (c) increases power consumption (d) reduces power consumption

Description : The formation of frost on cooling coils in a refrigerator (a) increases heat transfer (b) improves C.O.P. of the system (c) increases power consumption (d) reduces power consumption

Last Answer : Ans: c

Cooling water is required for following equipment in ammonia absorption plant (a) condenser (b) evaporator (c) condenser and absorber (d) condenser, absorber and separator (rectifier).

Description : Cooling water is required for following equipment in ammonia absorption plant (a) condenser (b) evaporator (c) condenser and absorber (d) condenser, absorber and separator (rectifier).

Last Answer : Ans: d

Under-cooling in a refrigeration cycle (a) increases COP (b) decreases COF (c) COP remains unaltered (d) other factors decide COP

Description : Under-cooling in a refrigeration cycle (a) increases COP (b) decreases COF (c) COP remains unaltered (d) other factors decide COP

Last Answer : Ans: a

Choose the correct statement (a) A refrigerant should have low latent heat (b) If operating temperature of system is low, then refrigerant with low boiling point should be used (c) Pre-cooling and sub-cooling bf refrigerant are same (d) Superheat and sensible heat of a. refrigerant are same

Description : Choose the correct statement (a) A refrigerant should have low latent heat (b) If operating temperature of system is low, then refrigerant with low boiling point should be used (c) Pre-cooling and sub-cooling bf refrigerant are same (d) Superheat and sensible heat of a. refrigerant are same

Last Answer : Ans: b

One ton of the refrigeration is (a) the standard unit used in refrigeration problems (b) the cooling effect produced by melting 1 ton of ice (c) the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours (d) the refrigeration effect to produce 1 ton of ice at NTP conditions

Description : One ton of the refrigeration is (a) the standard unit used in refrigeration problems (b) the cooling effect produced by melting 1 ton of ice (c) the refrigeration effect to freeze 1 ton of water at ... ice at 0°C in 24 hours (d) the refrigeration effect to produce 1 ton of ice at NTP conditions

Last Answer : Ans: c

Condensing temperature in a refrigerator is the temperature (a) of cooling medium (b) of freezing zone (c) of evaporator (d) at which refrigerant gas becomes liquid

Description : Condensing temperature in a refrigerator is the temperature (a) of cooling medium (b) of freezing zone (c) of evaporator (d) at which refrigerant gas becomes liquid

Last Answer : Ans: d