There is need of cooling water at the following units of vapour absorption refrigeration plant:
Condenser and rectifier
Condenser, absorber and rectifier
Condenser, absorber, rectifier and evaporator
Condenser, absorber and heat exchanger
The most distinguishing feature of absorption type refrigerator is
Uses onlu low grade of energy in the form of heat
Small size for the same refrigerating effect
Higher coefficient of performance
Quieter operation
Choose the false statement in the context of vapour compression refrigeration system:
The efficiency of performance is the ratio of the refrigeration effect to the enthalpy increase in the compressor
For obtaining high COP, the pressure range of the compressor should be high
Dry compression permits high speeds to be used
The pipe diameter of the compressor on the suction side is bigger than that on the delivery side
The bank of tubes at the back of a domestic refrigerator of vapour compression type are
Condenser tubes
Evaporator tubes
Capillary tubes
Tubes carrying electric wires
The location of freezer in the top portion of a refrigerator result in
Less noise in the system
Quick cooling of entire chamber
No overheating of the motor
No adverse effect on environment
Which aspect is not true in the context of vapour absorption system when compared to vapour compression system?
Need for more precise equipment
Energy input is mainly heat which is a low grade energy
Energy supply is low; only ½ to 1/3 of cooling effect
Performance of the system is not affected by load variations
Lithium bromide is used as absorbent in
Electrolux refrigerator
Vapour absorption refrigeration
Vapour compression refrigeration
Steam jet refrigeration
Identify the usefulness of lithium bromide is a vapour absorption system:
Primary refrigerant
Secondary refrigerant
Absorbent
Lubricant
The most common type of absorption system in use in industrial application is based on the refrigerant absorbent combination of
Air-water
Lithium bromide-air
Carbon dioxide-water
Ammonia-water
Waste heat can be effectively used in which one of the following refrigeration systems?
Vapour compression cycle
Vapour absorption cycle
Air refrigeration cycle
Vortex refrigeration cycle
A rectifier is fitted in an ammonia absorption plant to
Superheat ammonia vapour
Remove the unwanted water vapour by heating the vapour mixture
Remove the unwanted water vapour by cooling the vapour mixture
Remove the unwanted water vapour by cooling the vapour mixture and condensing the water vapour
There is no need of rectifier in the vapour circuit of lithium bromide refrigeration plant because
Water vapour and lithium bromide cannot be seqarated
Condensation of vapour mixture can take place in the condenser
Lithium bromide is non-volatile
Vacuum conditions prevail in the lithium bromide plant
Which of the following machines can be used to obtain refrigeration at places where there is no electric power?
Air refrigeration
Steam jet refrigeration
Vapour compression
Vapour absorption
Which of the followings are synonyms?
Absolute humidity and specific humidity
Specific humidity and humidity ratio
Humidity ratio and relative humidity
Relative humidity and degree of saturation
Ratio of mass of water vapour in a given volume of mixture to the mass of water vapour in the same volume of saturated mixture at the same pressure and temperature is known as
Specific humidity
Humidity ratio
Relative humidity
Degree of saturation
Ratio of the specific humidity of a given volume of mixture to the specific humidity of the saturated mixture at the same temperature is called
Relative humidity
Humidity ratio
Percentage humidity
Degree of saturation