Home - Mechanical Engineering - Heat Transfer Refrigeration And Air Conditioning

Heat Transfer Refrigeration And Air Conditioning Online Exam Quiz

Important questions about Heat Transfer Refrigeration And Air Conditioning. Heat Transfer Refrigeration And Air Conditioning MCQ questions with answers. Heat Transfer Refrigeration And Air Conditioning exam questions and answers for students and interviews.

1. The conditioned air supplied to the room must have the capacity to take up

Options

A : room sensible heat load only

B : room latent heat load only

C : both room sensible heat and latent heat loads

D : none of the above

2. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

Options

A : lack of cooling water

B : water temperature being high

C : dirty condenser surface

D : all of these

3. Which of the following would lead to a reduction in thermal resistance?

Options

A : In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

B : In convection, stirring of the fluid and cleaning the heating surface.

C : In radiation, increasing the temperature and reducing the emissivity.

D : all of the above

4. The process, generally used in winter air-conditioning to warm and humidity the air, is called

Options

A : humidification.

B : dehumidification

C : heating and humidification

D : cooling and dehumidification

5. Which of the following refrigerant has the highest freezing point.

Options

A : Ammonia

B : Carbon dioxide

C : Sulphur dioxide

D : R-12

6. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.

Options

A : True

B : False

C :

D :

7. The coefficient of performance of electrolux refrigerator is the ratio of

Options

A : heat supplied by the gas burner to the heat absorbed by the evaporator

B : heat absorbed by the evaporator to the heat supplied by the gas burner

C : heat supplied by the gas burner minus the heat absorbed by the evaporator to the heat supplied by the gas burner

D : heat absorbed by the evaporator minus the heat supplied by the gas burner to the heat absorbed by the evaporator

8. The freon group of refrigerants are

Options

A : halo-carbon refrigerants

B : azeotrope refrigerants

C : inorganic refrigerants

D : hydro-carbon refrigerants

9. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.

Options

A : temperature

B : humidity

C :

D :

10. At 100% relative humidity, wet bulb temperature, dry bulb temperature, dew point temperature and saturation temperature are equal.

Options

A : Correct

B : Incorrect

C :

D :

1. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be

Options

A : positive

B : negative

C : zero

D : none of these

2. The refrigerant supplied to a compressor must be

Options

A : superheated vapour refrigerant

B : dry saturated liquid refrigerant

C : a mixture of liquid and vapour refrigerant

D : none of these

3. According to Stefan's law, the total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature.

Options

A : Correct

B : Incorrect

C :

D :

4. During sensible heating of air, specific humidity remains constant.

Options

A : Agree

B : Disagree

C :

D :

5. Air refrigeration cycle is used in

Options

A : commercial refrigerators

B : domestic refrigerators

C : air-conditioning

D : gas liquefaction

6. In electrolux refrigerator

Options

A : ammonia is absorbed in hydrogen

B : ammonia is absorbed in water

C : ammonia evaporates in hydrogen

D : hydrogen evaporates in ammonia

7. The wet bulb depression is zero when relative humidity is

Options

A : zero

B : 0.5

C : 0.75

D : 1.0

9. A good refrigerant should have

Options

A : high latent heat of vaporisation and low freezing point

B : high operating pressures and low freezing point

C : high specific volume and high latent heat of vaporisation

D : low C.O.P. and low freezing point

10. Dew point temperature corresponds to the saturation temperature of vapour at its partial pressure.

Options

A : True

B : False

C :

D :

1. The sensible heat during humidification process decreases.

Options

A : True

B : False

C :

D :

Mechanical Engineering more Online Exam Quiz

Copyright © 2021
Exam-GK-MCQ-Questions.Com | Contact Us | Privacy Policy | Terms of Use | Sitemap | 0.021385908126831