Air-Conditioning MCQ

Test your knowledge with important Air-Conditioning MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Air-Conditioning MCQs at Bissoy

• The effective temperature increases with a decrease in relative humidity at the same DBT.
  ক

  True

  খ

  False
• Which of the following does not mainly a factor of dependency for the degree of warmth or cold?
  ক

  Relative humidity

  খ

  WBT

  গ

  Air velocity

  ঘ

  DBT
• When the heat stored in the body is ________ the human body feels comfortable.
  ক

  zero

  খ

  infinite

  গ

  positive

  ঘ

  negative
• The heat production from a normal healthy man when asleep is about _________
  ক

  50 W

  খ

  40 W

  গ

  70 W

  ঘ

  60 W
• Which of the following is true about the optimum effective temperature for human comfort?
  ক

  Same in winter and summer

  খ

  Not dependent on season

  গ

  Lower in winter than in summer

  ঘ

  Higher in winter than in summer
• What is the effective temperature needed in a hall with a high density of occupants?
  ক

  Higher

  খ

  Lower

  গ

  Much higher

  ঘ

  Has no effect of density of occupants
• What is the effective temperature needed if a person is sitting in a cinema hall?
  ক

  Higher

  খ

  Lower

  গ

  Much lower

  ঘ

  Has no effect of kind of activity
• What is the effective temperature needed if a person is doing a heavy activity like working with heavy loads?
  ক

  Higher

  খ

  Lower

  গ

  Much higher

  ঘ

  Has no effect of kind of activity
• What is the effective temperature needed if a person is entering his office?
  ক

  Higher

  খ

  Lower

  গ

  Much higher

  ঘ

  Has no effect of duration of stay
• What is the effective temperature needed if the duration of stay in a room is short?
  ক

  Higher

  খ

  Lower

  গ

  Much lower

  ঘ

  Has no effect of duration of stay
• People living in colder climate regions feel comfortable at lower effective temperature.
  ক

  True

  খ

  False
• What is the value of an increase in effective temperature do children need than older ones in case of maternity halls?
  ক

  1 to 2°C

  খ

  2 to 3°C

  গ

  3 to 4°C

  ঘ

  0 to 1°C
• Which of the following is true about effective temperature between young and older people?
  ক

  Tyoung > Told

  খ

  Tyoung < Told

  গ

  Tyoung ≪ Told

  ঘ

  Tyoung = Told
• What is the value of an increase in effective temperature do women need than men?
  ক

  about 1°C

  খ

  about 0.25°C

  গ

  about 0.5°C

  ঘ

  about 2°C
• Men need a higher effective temperature than women.
  ক

  True

  খ

  False
• A person with heavy clothing needs ____________ optimum temperature as compared to a person with light clothing.
  ক

  higher

  খ

  lesser

  গ

  zero

  ঘ

  same
• A person with _________ clothing needs ___________ optimum temperature.
  ক

  heavy, higher

  খ

  heavy, lesser

  গ

  light, higher

  ঘ

  light, lesser
• Which of the following provides the relationship between the optimum indoor effective temperature and optimum outdoor effective temperature?
  ক

  Clothing

  খ

  Occupants

  গ

  Duration of stay

  ঘ

  Climatic and seasonal differences
• Fog can be cleared by cooling.
  ক

  True

  খ

  False
• Even a lesser quantity of steam may result in the formation of fog.
  ক

  True

  খ

  False
• What is the value of final enthalpy if the enthalpies before mixing were 50 and 28 kJ / kg of dry air respectively and m2 / m1 = 2?
  ক

  38.67

  খ

  48.67

  গ

  40.05

  ঘ

  52
• What is the value of one of the mass before mixing if the other mass is 1.98 kg, and the final is 4.22 kg?
  ক

  2.24

  খ

  1.98

  গ

  4.22

  ঘ

  6.20
• What is the value of m1 / m2 if W1 = 0.0157 kg/ kg of dry air, W2 = 0.0084 kg / kg of dry air and W3 = 0.0103 kJ/ kg of dry air?
  ক

  0.31

  খ

  0.28

  গ

  0.35

  ঘ

  0.52
• What is the value of m1 / m2 if h1 = 81 kJ/ kg of dry air, h2 = 46 kJ/ kg of dry air and h3 = 58 kJ/ kg of dry air?
  ক

  1

  খ

  0

  গ

  0.51

  ঘ

  0.52
• When the adiabatic mixing is carried out, the air having ______ enthalpies and ____________ specific humidities are mixed.
  ক

  similar, similar

  খ

  different, similar

  গ

  similar, different

  ঘ

  different, different
• Which of the following is true for the adiabatic mixing of two streams?
  ক

  m3 = m3 – m1

  খ

  m2 = m1 + m3

  গ

  m1 = m3 + m2

  ঘ

  m3 = m1 – m2
• What is the formula for m1 / m2 in terms of specific humidity for adiabatic mixing of two streams?
  ক

  W2 – W1 / W1 – W3

  খ

  W3 – W1 / W1 – W3

  গ

  W3 – W2 / W1 – W3

  ঘ

  W3 – W2 / W2 – W3
• What is the formula for m1 / m2 in terms of enthalpies for adiabatic mixing of two streams?
  ক

  h1 – h2 / h1 – h3

  খ

  h3 – h2 / h1 – h3

  গ

  h3 – h2 / h2 – h3

  ঘ

  h3 – h2 / h1 – h2
• Relative humidity above 30% is not desired in summer comfort cooling.
  ক

  True

  খ

  False
• Effective temperature at Patna, Pune, Rajpur and Surat is similar.
  ক

  True

  খ

  False