MCQ COLING LOAD CALCULATIONS

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MCQ COLING LOAD

CALCULATIONS

MCQ increases level of clarity and

understanding. Cooling load calculations

means finding the capacity of the cooling

plant for a particular application. Cooling

loads consist of sensible and latent heat

load contributed by different sources.

Inside and outside design conditions

along with cooling loads help in the

design of air conditioning equipment.

  1. Meaning of cooling load calculations is to find the

    1. Heating capacity of the A/C plant

    2. Cooling capacity of the A/C plant

    3. Both (a) & (b)

    4. None

ANS: (c )

  1. Cooling load calculations include

    1. sensible heat loads

    2. Latent heat loads

    3. Both (a) & (b)

    4. None

ANS: (c )

  1. Sensible heat load is contributed by

    1. 6 sources

    2. 8 sources

    3. 10 sources

    4. None

ANS: (b)

  1. Latent heat is contributed by

    1. 5 sources

    2. 7 sources

    3. 9 sources

    4. None

ANS: (a)

  1. Sensible heat load through a wall is given by

    1. kA dt wall

    2. h A dt wall

    3. UA dt wall

    4. None

ANS: (c )

  1. Sensible heat load through glass is given by

    1. kA dt glass

    2. h A dt glass

    3. U A dt glass

    4. None

ANS: (a)

  1. Sensible heat load contributed by infiltration is

(a ) m. c p (to—ti)

(b) m. C v(to—ti)

(c) (c p +cv) (to—ti)

(d) None

ANS: (a)

  1. Sensible heat load contributed by additional infiltration is

(a ) m. c p (to—t i)

(b) m. C v(to—t i)

© m.(c p +c v) (to—t i)

(d)None

ANS: (a)

  1. Sensible heat load contributed by occupants is

    1. 240 kJ/h/person

    2. 160 kJ/h/person

    3. 400 kJ/h/person

    4. None

ANS: (b)

  1. Sensible heat load contributed by products being cooled is

    1. m c p (t–t freeing) +m c p(t final-t freezing)

    2. m Latent heat of products

    3. Both (a) & (b)

    4. None

ANS: (c )

  1. Sensible heat load contributed by miscellaneous factors is

    1. 30 %

    2. 20%

    3. 10%

    4. None

ANS: (c )

  1. Sensible heat load contributed by ventilation for 10 air changes per hour is

    1. ρ 10 V room C v (to—ti)

    2. ρ 10 Vroom Cp (to—ti)

    3. Both (a) & (b)

    4. None

ANS: (b)

  1. Latent heat load through a wall is given by

    1. kA Latent heat

    2. h A Latent heat

    3. UA Latent heat

    4. None

ANS: (d)

  1. Latent heat load through glass is given by

    1. kA Latent heat

    2. h A Latent heat

    3. UA Latent heat

    4. None

ANS: (d)

  1. Latent heat load contributed by infiltration is

(a)m. c p Latent heat of moisture

(b)m. C v Latent heat of moisture

©m. Latent heat of moisture

(d)None

ANS: (c)

  1. Latent heat load contributed by additional infiltration is

(a ) m. c p (to—ti)

(b)m. C v(to—ti)

© m.(c p +cv) (to—ti)

(d)None

ANS: (d)

  1. Latent heat load contributed by occupants is

(a)240 kJ/h/person

(b)160 kJ/h/person

©400 kJ/h/person

(d)None

ANS: (a)

  1. Latent heat load contributed by products being cooled is

    (a) m c p (t–t freeing) +m c p(t final-t freezing)

         (b)m Latent heat of products

         ©Both (a) & (b)

         (d)None

          ANS: (b )

  1. Latent heat load contributed by miscellaneous factors is

    1. 30 %

    2. 20%

    3. 10%

    4. None

ANS: (c )

  1. Latent heat load contributed by ventilation for 10 air changes per hour is

    1. ρ 10 Vroom C v (to—t i)

    2. ρ 10 Vroom Cp (to—t i)

    3. Both (a) & (b)

    4. None

ANS: (d)

  1. Sensible heat factor (SHF) is the ratio of

  1. Sensible heat load/Latent heat load

  2. Latent heat load/Sensible heat load

  3. Sensible heat load/ (SHL +LHL)

  4. None

ANS: (c )

  1. Room sensible heat factor is

  1. RSHL/RLHL

  2. RLHL/(RSHL+RLHL)

  3. RSHL/(RSHL+RLHL)

  4. None

ANS: (c )

  1. Grand sensible heat factor is

  1. GSHL/(GSHL+GLHL)

  2. GSHL/GLHL

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. GSHL is

  1. RSHL+RLHL

  2. TRHL+TVHL

  3. TVSHL+TVLHL

  4. None

ANS: (b)

  1. Inside design conditions are

  1. Constant

  2. Variable

  3. Can’t say

  4. None

ANS: (a)

  1. Outside design conditions are

  1. Constant

  2. Variable

  3. Can’t say

  4. None

ANS: (b)

  1. Which heat load is more in the rainy season?

  1. SHL

  2. LHL

  3. Both (a) & (b)

  4. None

ANS: (b)