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Test: Comfort Conditions - 2 - Mechanical Engineering MCQ


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9 Questions MCQ Test - Test: Comfort Conditions - 2

Test: Comfort Conditions - 2 for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: Comfort Conditions - 2 questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Comfort Conditions - 2 MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Comfort Conditions - 2 below.
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Test: Comfort Conditions - 2 - Question 1

Consider the following statements about mechanism of body heat loss:
1. The heat lost by human body to the surroundings mainly by convection and radiation.
2. Sensible heat loss and latent heat loss are two main component of human body heat loss to the surroundings.
3. Evaporative losses tends toward zero during winter season.
4. Sensible heate component of human body heat loss depends on the difference in water vapour pressures.

Which of the above statements is/are correct? 

Detailed Solution for Test: Comfort Conditions - 2 - Question 1

(i) The total heat loss, Q = sensible heat + latent heat sensible heat depends on convection, radiation and respiration.
(ii) Latent heat depends on evaporation of moisture.
(iii) In summer, evaporative losses are maximum.
(iv) in winter, evaporative losses are zero.

Test: Comfort Conditions - 2 - Question 2

The reason for a person feeling more comfortable on a warm day if seated in front of an electric fan is that the

Detailed Solution for Test: Comfort Conditions - 2 - Question 2

Due to electric fan, temperature difference for convection and evaporation increases. To maintain thermal equilibrium, the body starts perspiring to increase the evaporative loss.

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Test: Comfort Conditions - 2 - Question 3

Which of the following is considered comfort conditions in air-conditioning?

Detailed Solution for Test: Comfort Conditions - 2 - Question 3

A human body feels comfortable when the air is at 21°C DBT with 56% RH. In general, for summer air conditioning, the RH should not be less than 60% whereas for winter air conditioning it should not be more than 40%.

Test: Comfort Conditions - 2 - Question 4

The desirable air velocity in the occupied zone for comfort for summer air-conditioners is in the range of

Test: Comfort Conditions - 2 - Question 5

As compared to cold storage plant, air- conditioner of an auditorium requires air at

Test: Comfort Conditions - 2 - Question 6

The comfort chart is drawn between

Detailed Solution for Test: Comfort Conditions - 2 - Question 6

Comfort chart is drawn between DBT-in x-axis and WBT-in y-axis.

Test: Comfort Conditions - 2 - Question 7

The difference between the comfort air- conditioning and industrial air-conditioning lies in the

Detailed Solution for Test: Comfort Conditions - 2 - Question 7

In comfort air conditioning, the air is brought to the required dry bulb temperature and relative humidity for the human health comfort and efficiency, while in industrial air conditioning the inside dry bulb temperature and relative humidity of the air is kept constant for proper working of the machine and for the proper research and manufacturing processes.

Test: Comfort Conditions - 2 - Question 8

In room air-conditioning for comfort the supply air in summer should be a

Test: Comfort Conditions - 2 - Question 9

What are the general comfort conditions in an air-conditioning system?

Detailed Solution for Test: Comfort Conditions - 2 - Question 9

Explanation:

Effective temperature 

  • It is the temperature of saturated air at which a person or human being would feel the same level of comfort as in the actual environment.
  • It includes comfort temperature, velocity, and purity.

Factors affecting the effective temperature

Climatic and seasonal differences

  • People living in a warmer region feel comfortable at higher effective temperatures than people living in a colder region.
  • In summer the effective temperature is 21.6°C and in the case of winter, the optimum effective temperature is 20°C.

Age and Gender

  • Children and old age persons need 2-3°C higher effective temperature in comparison to adults. Same the case is with the women.

Kind of activity

  • If a person is involved in the foundry shop, dancing or jogging, etc needs a lower effective temperature in comparison to the person in the rest.

Density of occupants

  • Highly densely occupied needs a lower effective temperature in comparison to the less densely occupied.
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