Emerging Trends in Mechanical Engineering

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2.3 Hyperbolic Cooling towers

1   The pollutants that are present depend on __________ building material, as well.
    (A)   Cooling tower
    (B)   Water tower
    (C)   Steam tower
    (D)   Fire tower
[showhide type=”button7c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
2   The presence of these pollutants can cause a series of problems. The main problems that are caused______
    (A)   are fouling,
    (B)   limestone formation,
    (C)   Corrosion and biological
    (D)   All of the above
[showhide type=”button7c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
3   Most cooling towers are capacity rated at a “standard” wet bulb temperature of ___of
    (A)   72°F
    (B)   52°F
    (C)   78°F
    (D)   75°F
[showhide type=”button7c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
4   When sizing a cooling tower the highest anticipate__________ should be used?
    (A)   Dry bulb
    (B)   Wet bulb
    (C)   Both dry and wet bulb
    (D)   None of the above
[showhide type=”button7c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
5   In ________ cooling tower there is no direct contact between the water and Air.
    (A)   Dry type
    (B)   Evaporative type
    (C)   Once through
    (D)   All of the above
[showhide type=”button7c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
6   in cooling tower, higher temperature __________ corrosion potential
    (A)   Decrease
    (B)   Increase
    (C)   Temperature has no effect on corrosion
[showhide type=”button7c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
7   Which of the following faction affect the cooling tower performance?
    (A)   The range
    (B)   Heat load
    (C)   Wet bulb temperature
    (D)   All of the above
[showhide type=”button7c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
8   In which system is Cooling of hot water is done on tray as step by?
    (A)   Mechanical draught cooling system
    (B)   Hyperbolic cooling tower
    (C)   Atmospheric cooling tower
    (D)   Wet cooling tower
[showhide type=”button7c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
9   How does the flow of air occur in natural draught cooling towers?
    (A)   Natural pressure head density between cold outside air and humid inside air
    (B)   Variation in pressure of both cold outside air and humid inside air
    (C)   Due to the given air vents and vacuum ports
    (D)   Because of difference in the volume of both the of airs
[showhide type=”button7c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
10   The first hyperboloid shaped cooling tower was introduced by the Dutch engineers Frederik van Iterson and Gerard Kuypers and built in ………..
    (A)   1918
    (B)   1919
    (C)   1870
    (D)   1920
[showhide type=”button7c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
11   Hyperbolic cooling towers are made up of high height reinforced ………structure.
    (A)   plastic
    (B)   metal
    (C)   alloy
    (D)   concrete
[showhide type=”button7c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
12   The hyperbolic cooling towers are associated with ……. and …….. power plants.
    (A)   electrical, thermal
    (B)   Nuclear, electrical
    (C)   Thermal, nuclear
    (D)   None of above
[showhide type=”button7c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
13   Wind is the prime lateral load and its combination with self-weight of the tower shell can cause the buckling instability leading to …………….failure.
    (A)   Polytrophic
    (B)   Catastrophic
    (C)   Both a) & b)
    (D)   None of above
[showhide type=”button7c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
14   Cooling efficiency of a cooling tower is significantly affected under cross-wind condition and might decrease to……… in the range of moderate to high wind velocity condition.
    (A)   50%
    (B)   25%
    (C)   75%
    (D)   90%
[showhide type=”button7c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
15   The ……….-induced response of cooling tower is the key factor to improve safety and to reduce tower crack.
    (A)   Wind
    (B)   Heat
    (C)   Water
    (D)   Steam
[showhide type=”button7c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
16   Wind load analysis can be performed following methods.
    (A)   Experiments wind pressure coefficient
    (B)   Shape factors
    (C)   wind-induced vibration coefficient
    (D)   All of above
[showhide type=”button7c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
17   The ………..used to improve the stability of the total structure HCT.
    (A)   Concrete material
    (B)   Wind properties
    (C)   Stiffening rings
    (D)   Functional structure
[showhide type=”button7c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
18   For achieving maximum buckling stability use………….parameters.
    (A)   Location
    (B)   Quantity
    (C)   Dimensions
    (D)   All of above
[showhide type=”button7c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
19   Natural draft cooling towers are mainly used in the _____.
    (A)   Steel industry
    (B)   Fertilizer industry
    (C)   Alumina industry
    (D)   Power stations
[showhide type=”button7c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
20   A better indicator for cooling tower performance is _____.
    (A)   Wet bulb temperature
    (B)   Dry bulb temperature
    (C)   Range
    (D)   Approach
[showhide type=”button7c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
21   Cooling tower effectiveness is the ratio of _____.
    (A)   Range/ (range + approach)
    (B)   Approach/ (range + approach)
    (C)   Range/ Approach
    (D)   Approach/ Range
[showhide type=”button7c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
22   The cooling water reduces the water temperature close to _____.
    (A)   Dry bulb temperature
    (B)   Ambient wet bulb temperature
    (C)   Dew point temperature
    (D)   None of the above
[showhide type=”button7c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
23   The ratio of dissolved solids in circulating water to dissolved solids in makeup water is called.
    (A)   Liquid gas ratio
    (B)   Cycle of concentration
    (C)   Cooling tower effectiveness
    (D)   None of the above
[showhide type=”button7c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
24   Which one of the following is true to estimate the range of cooling tower?
    (A)   Range = Cooling water inlet temperature- wet bulb temperature
    (B)   Range = Cooling water outlet temperature- wet bulb temperature
    (C)   Range = heat load in kcal per hour / water circulation in liters per hour
    (D)   None of the above
[showhide type=”button7c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
25   Which one of the following fill material is more energy efficient for cooling towers in case of sea water cooling?
    (A)   Splash fill
    (B)   Film fill
    (C)   Low clog film fill
    (D)   None of the above
[showhide type=”button7c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
26   L/G ratio in a cooling tower is a ratio of _____.
    (A)   Length and girth
    (B)   Length and temperature gradient
    (C)   Water flow rate and air mass flow rate
    (D)   Air mass flow rate and water flow rate
[showhide type=”button7c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
27   Normally the guaranteed best approach a cooling tower can achieve is _____.
    (A)   5°C
    (B)   12°C
    (C)   8°C
    (D)   2.8°C
[showhide type=”button7c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
28   Hyperbolic cooling towers have become design standard for all natural draft towers because
    (A)   Their structural strength
    (B)   Minimum usage of material.
    (C)   Improving cooling efficiency
    (D)   All of the above
[showhide type=”button7c28″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
29   Common applications of cooling towers include
    (A)   Cooling the circulating water used in oil refineries
    (B)   petrochemical and other chemical plants
    (C)   thermal power stations
    (D)   All of the above
[showhide type=”button7c29″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
30   The hyperboloid cooling towers are often associated __
    (A)   with nuclear power plants
    (B)   Used in some coal-fired plants
    (C)   In some large chemical and other industrial plants.
    (D)   All of the above
[showhide type=”button7c30″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
31   ______ type of cooling towers is structurally strong.
    (A)   Counter flow towers
    (B)   Hyperbolic towers
    (C)   Cross flow towers
    (D)   None of the above
[showhide type=”button8c1″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
32   Which type of cooling towers operates through a chimney or stack ___?
    (A)   Cross flow
    (B)   Counter flow
    (C)   Hyperbolic
    (D)   All of above
[showhide type=”button8c2″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
33   Hyperbolic cooling towers are also referred as
    (A)   Natural draft towers
    (B)   Cross flow towers
    (C)   Hyperboloid towers
    (D)   None of the above
[showhide type=”button8c3″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
34   _____ type of cooling towers is used with nuclear power plants.
    (A)   Cross flow
    (B)   Natural draft
    (C)   Hyperbolic
    (D)   None of above
[showhide type=”button8c4″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
35   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
[showhide type=”button8c5″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
36   The first hyperbolic cooling tower was built in…
    (A)   1916
    (B)   1917
    (C)   1918
    (D)   1919
[showhide type=”button8c6″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
37   Thermal efficiencies up to……..have been observed in hybrid cooling towers
    (A)   92
    (B)   82
    (C)   72
    (D)   62
[showhide type=”button8c7″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
38   Which of the following is the simplest method of cooling the condenser water?
    (A)   Spray cooling pond
    (B)   Cooling tower
    (C)   Indirect air cooling
    (D)   Hyperbolic cooling tower
[showhide type=”button8c8″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
39   Natural Draft or Hyperbolic towers have been used for
    (A)   Large Capacity of water
    (B)   Small Capacity of Water
    (C)   High Efficiency
    (D)   Low capital cost
[showhide type=”button8c9″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
40   Why is exhaust steam coming out of turbine is admitted to a steam header?
    (A)   To increase the pressure
    (B)   To decrease the velocity
    (C)   To decrease the pressure drop
    (D)   To control the pollution
[showhide type=”button8c10″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
41   How is air produced in mechanical draught cooling tower?
    (A)   Air Tuyeres
    (B)   Propeller fans
    (C)   Air blowers
    (D)   Louvre
[showhide type=”button8c11″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
42   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
[showhide type=”button8c12″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
43   Natural draft cooling tower are mainly used in
    (A)   Steel Industry
    (B)   Alumina industry
    (C)   Fertilizer industry
    (D)   Power station
[showhide type=”button8c13″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
44   Cooling tower effectiveness is the ratio of
    (A)   Range/ (Range + approach)
    (B)   Approach/ (range + approach)
    (C)   Range / (range – approach)
    (D)   Approach/ / (range – approach)
[showhide type=”button8c14″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
45   Which one of the following is true to estimate the range of cooling tower?
    (A)   Range = cooling water inlet temperature – wet bulb temperature
    (B)   Range = cooling water outlet temperature – wet bulb temperature
    (C)   Range = heat load in kcal per hour / water circulation in lines per hour
    (D)   None of the above
[showhide type=”button8c15″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
46   The ratio of dissolved solids in circulating water to the dissolved solids in makeup water is called
    (A)   Liquid gas ratio
    (B)   Cycle of concentration
    (C)   Cooling tower effectiveness
    (D)   None of the above
[showhide type=”button8c16″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
47   Cooling tower is a ______device
    (A)   Heat absorption
    (B)   Heat rejection
    (C)   Both a and b
    (D)   Neither a nor b
[showhide type=”button8c17″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
48   In natural draft cooling tower the air flow is obtained by___________
    (A)   Difference in air pressure
    (B)   Difference in air temperature
    (C)   Difference in air speed
    (D)   None of the above
[showhide type=”button8c18″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
49   In the natural draft cooling tower_________ is not required
    (A)   Fan
    (B)   Tower
    (C)   Nozzle
    (D)   None of the above
[showhide type=”button8c19″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
50   Which among the following are the components of natural draft cooling tower?
    (A)   Supply basin
    (B)   Reinforced concrete
    (C)   Hot water distribution
    (D)   None of the above
[showhide type=”button8c20″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
51   Water lost in form of liquid droplet is called as ______________
    (A)   Drift
    (B)   Water loss
    (C)   Water evaporation
    (D)   None of the above
[showhide type=”button8c21″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
52   The effect that takes place which results in cooling action is
    (A)   Condensing
    (B)   Heating
    (C)   Cooling
    (D)   Evaporating
[showhide type=”button8c22″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]
53   How many times year cooling water must be cleaned
    (A)   Once a year
    (B)   Thrice a year
    (C)   Twice a year
    (D)   Four times a year
[showhide type=”button8c23″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
54   How many times chlorination must be carried out for cooling towers
    (A)   Twice a year
    (B)   Once a year
    (C)   Thrice a year
    (D)   None of above
[showhide type=”button8c24″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: A [/showhide]
55   Cooling towers operate through a ____process that efficiently cools the already cycled water to be reused.
    (A)   Heat exchange
    (B)   Heat expand
    (C)   Heat transfer
    (D)   None of above
[showhide type=”button8c25″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: C [/showhide]
56   In hyperboloid cooling towers the material is filled at
    (A)   Tower’s bottom
    (B)   Tower’s top
    (C)   near tower
    (D)   None of above
[showhide type=”button8c26″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: B [/showhide]
57   Pollution caused by cooling tower includes
    (A)   Fouling
    (B)   Limestone formation
    (C)   Corrosion
    (D)   All of above
[showhide type=”button8c27″ more_text=”Show Answer” less_text=”Hide Answer”] Answer: Option: D [/showhide]

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