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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