Vapor Absorption Refrigeration System

Mechanical Engineering

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This set of Refrigeration and Air conditioning Multiple Choice Questions & Answers (MCQs) focuses on Vapor Absorption Refrigeration System

Q1 | Electrolux refrigerators is
  • Vapour compression refrigerator with one compressor
  • vapour absorption refrigerator with no pump
  • vapour absorption refrigerator with one aqua pump
  • None of the above
Answer: vapour absorption refrigerator with no pump
Q2 | The Wet bulb depression is zero when Relative humidity equals
  • 0
  • 0.5
  • 0.75
  • 1
Answer: 1
Q3 | .In a psychrometric chart, the vertical lines parallel to the ordinate indicate
  • Dry bulb Temperature
  • Wet bulb Temperature
  • Specific humidity
  • Enthalpy of saturation
Answer: Dry bulb Temperature
Q4 | Which of the following statements are TRUE?
  • Thermodynamic WBT is a property of moist air, while WBT as measured by wet bulb thermometer is not a property
  • Both the thermodynamic WBT and WBT as measured by wet bulb thermometer are properties of moist air
  • Under no circumstances, dry bulb and wet bulb temperatures are equal
  • Wet bulb temperature is always lower than dry bulb temperature, but higher than dew point temperature
Answer: Thermodynamic WBT is a property of moist air, while WBT as measured by wet bulb thermometer is not a property
Q5 | Which of the following statements are TRUE?
  • During cooling and humidification process, the enthalpy of air decreases
  • During cooling and humidification process, the enthalpy of air increases
  • During cooling and humidification process, the enthalpy of air remains constant
  • During cooling and humidification process, the enthalpy of air may increase, decrease or remain constant depending upon the temperature of the wet surface
Answer: During cooling and humidification process, the enthalpy of air may increase, decrease or remain constant depending upon the temperature of the wet surface
Q6 | An air stream at a flow rate of 1 kg/s and a DBT of 30 C mixes adiabatically with another air stream flowing with a mass flow rate of 2 kg/s and at a DBT of 15 C. Assuming no condensation to take place, the temperature of the mixture is approximately equal to:
  • 20 C
  • 22.5 C
  • 25 C
  • Cannot be found
Answer: 20 C
Q7 | The temperature at which the water vapour in the air starts. condensing is known as
  • dew point
  • dry bulb
  • wet bulb
  • saturation
Answer: dew point
Q8 | When moisture is added to air at constant dry bulb temperature, the process is known as
  • Sensible cooling
  • humidification
  • dehumidification
  • Chilling
Answer: humidification
Q9 | Which of the following can be measured by a sling psychrometer?
  • Wet bulb temperature
  • Dry bulb as well as wet bulb temperatures
  • Specific humidity
  • Absolute humidity
Answer: Dry bulb as well as wet bulb temperatures
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