RAC Section No. 1

A reversible Carnot cycle used for refrigeration

comprises

• Two isentropic and two adiabatic processes

• Two isentropic and two constant volume processes

• Two isentropic and two constant pressure process

• Two isentropic and two isothermal processes

Where does the low pressure liquid become a gas (vapour)?

• Evaporator

• Condenser

• TX valve

• Compressor

The two major functions of the compressor are to circulate refrigerant and to compress ____________. 

• Low-pressure refrigerant vapor into hot, high temperature vapor
• High-pressure refrigerant vapor into high-temperature, low temperature liquid
• Low-pressure refrigerant liquid into hot, high temperature vapor
• Low-pressure refrigerant liquid into hot, high temperature liquid

As refrigerant moves through the condenser it goes from _____ to ________

• a Vapor to a Liquid

• a Liquid to a Vapor

• Low pressure Vapor to a low pressure vapor

• High pressure liquid to a low pressure liquid

The heat removing capacity of one tone of refrigeration is equal to?

• 210 Watt

• 210 kJ/hour

• 3.5 kJ/hour

• 3.5 W

In which type of air refrigeration system a secondary compressor is used?

• Reduced ambient type air refrigeration System

• Regenerative type air refrigeration System

• Simple air refrigeration System

• Boot strap air refrigeration System

The COP of a refrigerator is 4. What will be the COP of a heat pump if it is working between same source and sink temperature ?

• 2

• 3

• 4

• 5

One tonne of refrigerating machine means that,

• One tonne is the total mass of the machine

• One tonne of refrigerant is used

• One tonne of water can be converted into ice.

• One tonne of ice when melts from and at 0^oC in 24 hours, the refrigerating effect produced is equivalent to 210 KJ/min

In air conditioning of aeroplanes, using air as refrigerant, the cycle used is

• Reversed Carnot cycle

• Reversed Joule cycle

• Reversed Brayton cycle

• Reversed Otto cycle

The condition of refrigerant after passing through the condenser in a vapour compression system is

• (A) Saturated liquid

• (B) Wet vapour

• (C) Dry saturated vapour

• (D) Superheated vapour