Interview Questions.

Q1. What Is Wet Bulb Depression?

Wet bulb despair is the distinction between dry bulb temperature and wet bulb temperature.

Q2. Why Rate Of Condensation Is Higher On A Polished Surface Compared To Rusty Surface?

Polished surface promotes drop wise condensation and does not wet the surface.

Q3. Define Co-efficient Of Performance?

In case of engine the overall performance is judged the performance of the engine. That is – Efficiency = Work Done / Heat Supplied .

And in case of refrigeration the procedure is first reversed this is we ought to deliver work to achieve lower temperature  or say for that removal of heat. Thus performance of refrigeration is simply reversed . That is – N/W

Where – N = The price of heat abstracted from the frame in given time technically referred to as “Net Refrigeration Effect” and W = Work Done .

Thus COP = Net Refrigeration Effect / Work Done Supplied . This is Called Theoretical COP .

Q4. What Is Air Conditioners?

Air Conditioner constantly draws the air from the space to be cooled & cools it with the aid of the principle of refrigeration and discharge it lower back to the identical indoor area that need to be cooled.

Q5. What Is Refrigeration?

Refrigeration is the method of continuously cooling or extraction of warmth from the environment or environment with the assist of external paintings.

Q6. What Is The Capacity Of One Tonne Machine In Mks System?

In MKS device a system having ability to provide cooling impact of fifty kcal/minute is understood to be a “One Tonne Machine”

Q7. What Is Mechanical Refrigeration ?

Producing cold with the aid of machine.

Q8. How Much Resistance Is Offered To Heat Flow By Dropwise Condensation?

Nill.

Q9. Classify The Different Refrigeration Systems?

It can be of the following three types:

Vapor Compression Refrigeration System

Vapor absorption Refrigeration System 

Air Refrigeration Systems

Q10. What Is One Tonne Of Refrigeration ?

One Tonne of Refrigeration me system is capable of doing away with warmth from a body same to the heat absorbed through one tonne of ice when it melts from 0 ° C to 0 ° C Water in 24 hours . Here one tonne is same to 2000 lb .

Q11. What Will Be The Relative Humidity At Saturation Point?

Relative humidity = one hundred %

Q12. Difference Between The Refrigeration And Heat Pump?

Refrigerators ejects warmth with paintings input. But heat pumps gives heat with work input.

Refrigerator incorporates the warmth pump, it pumps the heat out in order that your gadget remains cold.

Q13. Explain The Principle Of Refrigeration?

The operation is in line with the second one regulation of thermodynamics - Heat can be made to flow from cold body to warm body with the assist of outside supply.

Q14. Which Unit Produces Cooling Effect In The Refrigeration System ?

The evaporator

Q15. Define Relative Humidity?

Relative humidity is the ratio between the real moisture content material of the air in comparison with the moisture content of the air required for saturation on the equal temperature.

Q16. What Is Sensible Heat Ratio (shr)?

The Sensible Heat Ratio (SHR) specific the ratio between the practical heat load and the whole warmness load.

Q17. What Are The Basic Units Of Mechanical Refrigeration Systems?

Refrigeration device has 4 basic devices

An Evaporator – The cooling Unit

A pump or Compressor

A Condenser – The heat disposer

A liquid mixing tool – Expion valve or cylinder or capillary tube

Q18. What Is Relative Cop ?

It is the ratio of real COP and Theoretical COP

Q19. What Is The Unit Of Refrigeration?

As Power Unit of mechanical devices is given by way of H.P , for electric equipment the unit of electricity is kW or MW . In the equal manner the unit of refrigeration is  ” Tonnes of Refrigeration ”