Thermal Engineering II Set 21

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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 21

Q1 | Viscous type filters are made of screens of spilt wire and coated with non-drying viscous oil in order to catch and remove the dust particles from the incoming air.
  • true
  • false
Q2 | Which of the following types of filters used in the air conditioning system is made of cloth that is discarded on getting dirty?
  • viscous type filters
  • dry filter
  • spray washers
  • electric precipitators
Q3 | Which of the following statements about electric precipitators is false?
  • they are used to remove dust by providing a strong electric field
  • their initial installation cost is high
  • their operational cost is low
  • dust particles get attached to the positive electrode
Q4 | The process of extraction of the certain required amount of water from air is known as                        
  • heating
  • cooling
  • humidification
  • dehumidification
Q5 | Which of the following is capable of absorbing excess moisture from the air?
  • silica gel
  • charcoal
  • salts of calcium or ammonia
  • activated alumina
Q6 | Open cooling system is also called as
  • parallel system
  • once through system
  • air based system
  • non-reversible system
Q7 | How many number of spray nozzle does each module on spray pond cooling system contains?
  • 1
  • 2
  • 3
  • 4
Q8 | Which of the following is the simplest method of cooling the condenser water?
  • spray cooling pond
  • cooling tower
  • indirect air cooling
  • hyperbolic cooling tower
Q9 | In which type of cooling system are nozzles arranged on different elevation?
  • single deck system
  • double deck system
  • natural flow system
  • direct flow system
Q10 | What are used in the direct flow system to transverse the pond before uniting at intake?
  • separators
  • filters
  • baffle walls
  • porous pipes
Q11 | Select the disadvantage of cooling pond out of the given?
  • the area required of cooling in a cooling pond is small
  • spray losses due to evaporation and windage run high
  • there is no control over the temperature of cooled water
  • the cooling efficiency is low compared with cooling water
Q12 | What type of cooling system is used in the large power plants?
  • cooling ponds
  • natural flow system
  • cooling towers
  • single deck system
Q13 | How does outside air enter into the wet cooling system?
  • air vents
  • louvers
  • tuyeres
  • vacuum
Q14 | How is water circulated throughout the dry cooling tower system?
  • finned tubes
  • metal pipes
  • porous tubes
  • swirling tubes
Q15 | Why is exhaust steam coming out of turbine is admitted to a steam header?
  • to increase the pressure
  • to decrease the velocity
  • to decrease the pressure drop
  • to control the pollution
Q16 | In which system is Cooling of hot water is done on tray as step by?
  • mechanical draught cooling system
  • hyperbolic cooling tower
  • atmospheric cooling tower
  • wet cooling tower
Q17 | How is air produced in mechanical draught cooling tower?
  • air tuyeres
  • propeller fans
  • air blowers
  • louvre
Q18 | Why is induced draught considered better than the forced draught?
  • because power requirement is high for forced draught
  • maintenance of induced draught fan is costlier
  • forced draught is less efficient
  • forced draught produces less amount of speed of air