If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be Less More/less depending on rating Same More TRUE ANSWER : ? YOUR ANSWER : ?
In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is Dry vapour High pressure saturated liquid Wet vapour Very wet vapour TRUE ANSWER : ? YOUR ANSWER : ?
The material of pipe lines for a system using Freon as a refrigerant should be Aluminium Copper Brass Steel TRUE ANSWER : ? YOUR ANSWER : ?
In a reversed Brayton cycle, the heat is absorbed by the air during Constant pressure expansion process Constant pressure cooling process Isentropic compression process Isentropic expansion process TRUE ANSWER : ? YOUR ANSWER : ?
One of the purposes of sub cooling the liquid refrigerant is to Reduce compressor discharge temperature Increase cooling effect Ensure that only liquid and not the vapour enters the expansion (throttling) valve Reduce compressor overheating TRUE ANSWER : ? YOUR ANSWER : ?
The condition of refrigerant after passing through the condenser in a vapour compression system is Superheated vapour Wet vapour Dry saturated vapour Saturated liquid TRUE ANSWER : ? YOUR ANSWER : ?
A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with Cp = 1 kJ/kg) 100 kJ/kg 25 kJ/kg 50 kJ/kg 125 kJ/kg TRUE ANSWER : ? YOUR ANSWER : ?
The pressure at the outlet of a refrigerant compressor is called Suction pressure Discharge pressure Back pressure Critical pressure TRUE ANSWER : ? YOUR ANSWER : ?
Vapour compression refrigeration is somewhat like Reversed Carnot cycle Carnot cycle None of these TRUE ANSWER : ? YOUR ANSWER : ?
The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is Bigger Equal Smaller Smaller/bigger depending on capacity TRUE ANSWER : ? YOUR ANSWER : ?