Thermodynamics and Refrigeration Systems Mid - II, November - 2014

1.During a refrigeration cycle, heat is rejected by the refrigerant in a
  • Compressor
  • Condenser
  • Evaporator
  • Expansion value
Answer: B
2.Which of the following refrigerant is highly toxic and flammable
  • Ammonia
  • Carbon dioxide
  • Sulphur dioxide
  • Freon-12
Answer: B
3.The vapour compression refrigeration cycle is similar to
  • Carnot cycle
  • Reverse Carnot cycle
  • Rankine cycle
  • Reverse refrigeration cycle
Answer: B
4.The maximum theoretical efficiency cycle is referred in
  • Bell-Coleman cycle
  • Carnot cycle
  • Vapour compression cycle
  • Reverse carnot cycle
Answer: D
5.For summer air conditioning the relative humidity should not be less than
  • 40%
  • 60%
  • 75%
  • 90%
Answer: C
6.In air conditioning, dirt, dust, etc., are removed by
  • Scrubbers
  • Filters
  • Sweeps
  • Cyclone separator
Answer: B
7.Air refrigerator works on
  • Carnot cycle
  • Rankine cycle
  • Reverse carnot cycle
  • Bell coleman cycle
Answer: C
8.In Freon systems, the component normally installed in the liquid line is
  • Rotameter
  • Dryer
  • Pressure gauge
  • Injector
Answer: B
9.The drying rate is dependent upon
  • air temperature
  • air flow rate
  • relative humidity
  • all the above
Answer: D
10.During sensible cooling of air, the specific humidity
  • Increases
  • Decreases
  • Remains constant
  • None
Answer: C
11.The chemical name of refrigerant R22 is __________________.
Answer: Difloro mono chloro methane
12.The difference between dry bulb temperature and wet bulb temperature is called __________________.
Answer: Dew point depression
13.Winter air conditioning units consists of heating and __________________ processes.
Answer: Humidifying
14.Bell-coleman cycle uses ________ as refrigerant.
Answer: Air
15.Cooling could be produced by adiabatic demagnetization of __________.
Answer: Paramagnetic salt
16.Throttling process also called ___________.
Answer: Isenthalphic process or constant enthalpy process
17.In vapour compression refrigeration cycle the maximum temperature drop occurs during ____________________ process.
Answer: Throttling
18.The expansion process in which the vapourisation of a part of the liquid causing the lowering of its temperature is called __________________.
Answer: Flashing
19.The addition of moisture to the air , without change in its dry bulb temperature , is known as _______________________
Answer: Humidification
20.In a psychometric chart, curved lines indicate ________________________.
Answer: Relative humidity lines