The emissivity of a polished silver body is ____ as compared to black body. High Very low Same Low TRUE ANSWER : ? YOUR ANSWER : ?
If a gas is to be liquefied, its temperature must be None of these Equal to critical temperature Reduced to a value below its critical temperature Increased to a value above its critical temperature TRUE ANSWER : ? YOUR ANSWER : ?
A vapour absorption refrigeration system Gives quiet operation Gives noisy operation Requires little power consumption Cools below 0°C TRUE ANSWER : ? YOUR ANSWER : ?
A bootstrap air cooling system has Two heat exchangers One heat exchanger Three heat exchangers Four heat exchangers TRUE ANSWER : ? YOUR ANSWER : ?
The material of pipe lines for a system using Freon as a refrigerant should be Copper Brass Steel Aluminium TRUE ANSWER : ? YOUR ANSWER : ?
One tonne of refrigeration (1TR) means that the heat removing capacity is 21 kJ/min 420 kJ/min 210 kJ/min 620 kJ/min TRUE ANSWER : ? YOUR ANSWER : ?
In a domestic vapour compression refrigerator, the refrigerant commonly used is CO? Ammonia R-12 All of these TRUE ANSWER : ? YOUR ANSWER : ?
The relative humidity lines on a psychrometric chart are Curved lines Horizontal and non-uniformly spaced Horizontal and uniformly spaced Vertical and uniformly spaced TRUE ANSWER : ? YOUR ANSWER : ?
The sensible heat factor during cooling and dehumidification process is given by (where h₁ = Enthalpy of air entering the cooling coil, h₂ = Enthalpy of air leaving the cooling coil, and hA = Enthalpy of air at the end of dehumidification process) (hA - h2)/ (h1 - h2) (h1 - h2)/ (hA - h2) (h2 - hA)/ (h1 - h2) (hA - h1)/ (h2 - h1) TRUE ANSWER : ? YOUR ANSWER : ?
The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as Dew point temperature None of the listed here Effective temperature Mean radiant temperature TRUE ANSWER : ? YOUR ANSWER : ?