Formation of frost on evaporator in refrigerator Increases heat transfer rate Results in loss of heat due to poor heat transfer Can be avoided by proper design Is immaterial TRUE ANSWER : ? YOUR ANSWER : ?
The heat rejection factor (HRF) is given by 1 - (1/C.O.P) 1 + C.O.P 1 - C.O.P. 1 + (1/C.O.P) TRUE ANSWER : ? YOUR ANSWER : ?
In a vapour compression cycle, the refrigerant immediately after expansion valve is Sub-cooled liquid Liquid Saturated liquid Wet vapour TRUE ANSWER : ? YOUR ANSWER : ?
In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about 1.25 2.15 5.12 1 TRUE ANSWER : ? YOUR ANSWER : ?
In case of sensible cooling of air, the coil efficiency is given by 1/ B.P.F. 1 - B.P.F. 1 + B.P.F. P.F. - 1 TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following refrigerant has the lowest freezing point? R-12 R-11 Ammonia R-22 TRUE ANSWER : ? YOUR ANSWER : ?
The superheating in a refrigeration cycle Increases C.O.P. Decreases C.O.P. Does not alter C.O.P. None of these TRUE ANSWER : ? YOUR ANSWER : ?
A bootstrap air cooling system has One heat exchanger Four heat exchangers Three heat exchangers Two heat exchangers TRUE ANSWER : ? YOUR ANSWER : ?
One ton refrigeration corresponds to 80 kcal/ hr 50 kcal/ hr 50 kcal/ min 80 kcal/ min TRUE ANSWER : ? YOUR ANSWER : ?
The wet bulb depression indicates _________ humidity of the air. Relative Absolute None of these Specific TRUE ANSWER : ? YOUR ANSWER : ?