MCQ PSYCHROMETRY

 

https://www.mesubjects.net/wp-admin/post.php?post=7875&action=edit        Psychrometric Properties

https://www.mesubjects.net/wp-admin/post.php?post=7878&action=edit          Psychrometric chart

https://www.mesubjects.net/wp-admin/post.php?post=3704&action=edit          Question Bank Psychrometry

https://www.mesubjects.net/wp-admin/post.php?post=3094&action=edit          Q. Ans Psychrometry-1

https://www.mesubjects.net/wp-admin/post.php?post=2884&action=edit            Q. Ans. Psychrometry -2

https://www.mesubjects.net/wp-admin/post.php?post=586&action=edit                Q. Ans. Psychrometric Chart

 

MCQ PSYCHROMETRY

MCQ on psychrometry increases level of

understanding & clarity. Psychrometry

deals with the properties of moist air.

Psychrometric processes help to reach

from the existing condition of air to reach

the design conditions. It is very useful in

air conditioning applications.

  1. Psychrometry deals with

    1. Dry air

    2. Moist air

    3. Both dry & moist air

    4. None

ANS: (b)

  1. Dry bulb temperature is given by

    1. Bulb of an ordinary thermometer

    2. Wet bulb of a psychrometer

    3. Can’t say

    4. None

ANS: (a)

  1. Wet bulb temperature is given by

    1. Bulb of an ordinary thermometer

    2. Wet bulb of a psychrometer

    3. Can’t say

    4. None

ANS: (b)

  1. Dew point temperature is that temperature at which

    1. Water droplet start coming on sensible cooling of air

    2. Water droplet start adding into the air on sensible heating

    3. Can’t say

    4. None

ANS: (a)

         5. Relative humidity is the ratio of

    1. Firstly    Moisture in a given volume of air/Moisture in the same volume when saturated at the same temperature

    2. Secondly     Moisture in a given volume when saturated / Moisture in a given volume of air at the same temperature

    3. Thirdly     Moisture in a given mass of air/Moisture in the same mass when saturated at the same temperature

    4. None

ANS: (a)

      6. Humidity ratio is the ratio of

    1. Firstly    Moisture in a given volume of air/Moisture in the same volume when saturated at the same temperature

    2. Secondly     Moisture in a given volume when saturated /Moisture in a given volume of air at the same temperature

    3. Thirdly     Moisture in a given mass of air/Moisture in the same mass when saturated at the same temperature

    4. None

ANS: ©

  1. Specific volume of air means

    1. Volume per kg of dry air

    2. Volume per kg of moist air

    3. Can’t say

    4. None

ANS: (a)

  1. Specific enthalpy of air at a certain temperature means

    1. Enthalpy of dry air

    2. Enthalpy of 1 kg of dry air + enthalpy of moisture associated with 1 kg of dry air

    3. Both (a) & (b)

    4. None

ANS: (b)

  1. Specific humidity means

    1. Mass of moisture in a certain volume of air

    2. Mass of moisture per kg of dry air

    3. Both (a) & (b)

    4. None

ANS: (b)

  1. Sensible heating of air means

    1. Only rise of temperature

    2. Rise of temperature & moisture

    3. Can’t say

    4. None

ANS: (a)

  1. Sensible cooling of air means

    1. Only decrease of temperature

    2. Decrease of temperature & moisture

    3. Can’t say

    4. None

ANS: (a)

  1. Humidification means addition of

    1.  Heat

    2.  Moisture

    3. Heat and moisture

    4. None

ANS: (b)

  1. Dehumidification means addition of

    1.  Heat

    2.  Moisture

    3. Heat and moisture

    4. None

ANS: (d)

  1. Humidification means removal of

    1.  Heat

    2. Moisture

    3. Heat and moisture

    4. None

ANS: (b)

  1. Adiabatic saturation of air means addition of

    1. Heat at constant temperature

    2. Moisture at constant temperature

    3.  Moisture at constant enthalpy

    4. None

ANS: (c )

  1. Heating & humidification means addition of

    1.  Latent heat & moisture

    2.  Sensible heat

    3. Sensible heat & moisture

    4. None

ANS: (c )

  1. Cooling & dehumidification means addition of

    1.  Latent heat & moisture

    2.  Sensible heat

    3. Sensible heat & moisture

    4. None

ANS: (d )

  1. Cooling & dehumidification means removal of

    1.  Latent heat & moisture

    2.  Sensible heat

    3.  Sensible heat & moisture

    4. None

ANS: (c )

  1. For saturated air

    1. Firstly          tdb > twb > tdp

    2. Secondly      tdb < twb < tdp

    3. Thirdly          tdb = twb = tdp

    4. None

ANS: ©

  1. The equation of specific humidity is

    1. Firstly         w = 0.622 pwv/(pt–pwv)

    2. Secondly       w = 0.622 pwv/pt

    3. Thirdly            w = 0.622 pwv/(pt+pwv)

    4. None

ANS: (a)

  1. The equation of relative humidity is

    1. Firstly        Ф = pv/pvs

    2. Secondly    Ф = pt/pvs

    3. Thirdly        Ф = pv/pt

    4. None

ANS: (a)

  1. The equation for enthalpy of moist air is

    1. Firstly        hma = 1 cp dt + w cpv (tdb -tdp)

    2. Secondly    hma = 1 cp dt + w [h0 +cpv (tdb -tdp)]

    3. Thirdly        hma = 1 cp dt + w [h0 +cpv (tdb –twb)]

    4. None

ANS: (b)

  1. A Sling Psychrometer contains

    1. Dry bulb thermometer

    2. Wet b ulb thermometer

    3. Both (a) & (b)

    4. None

ANS: (c )

  1. When two steams of moist air are mixing, the properties of the final steam are found by

    1. Enthalpy and Temperature balance

    2. Temperature and moisture balance

    3. Enthalpy and moisture balance

    4. None

ANS: (c )