Which of the following cycles uses air as the refrigerant? Bell Coleman Ericson Stirling Carnot TRUE ANSWER : ? YOUR ANSWER : ?
In S.J. unit, one ton of refrigeration is equal to 420 kJ/ min 21 kJ/ min 840 kJ/ min 210 kJ/ min TRUE ANSWER : ? YOUR ANSWER : ?
Ammonia absorption refrigeration cycle requires Very little work input Maximum work input Zero work input Nearly same work input as for vapour compression cycle TRUE ANSWER : ? YOUR ANSWER : ?
A standard ice point temperature corresponds to the temperature of Ice at 4°C Water at 0°C Solid and dry ice Mixture of ice and water under equilibrium conditions TRUE ANSWER : ? YOUR ANSWER : ?
The heat rejection factor (HRF) is given by 1 - C.O.P. 1 + (1/C.O.P) 1 + C.O.P 1 - (1/C.O.P) TRUE ANSWER : ? YOUR ANSWER : ?
An infinite parallel planes with emissivities e₁ and e₂, the interchange factor for radiation from surface 1 to surface 2 is given by 1/e₁ + 1/e₂ (e₁ + e₂)/ e₁ + e₂ - e₁e₂ e₁e₂ e₁ + e₂ TRUE ANSWER : ? YOUR ANSWER : ?
In case of sensible cooling of air, the coil efficiency is given by 1/ B.P.F. P.F. - 1 1 + B.P.F. 1 - B.P.F. TRUE ANSWER : ? YOUR ANSWER : ?
In aircraft, air refrigeration Cycle is used because of Higher coefficient of performance Low weight per tonne of refrigeration High heat transfer rate Low temperature at high altitudes TRUE ANSWER : ? YOUR ANSWER : ?
The C.O.P. of an absorption type refrigerator is given by (where T₁ = Temperature at which the working substance receives heat, T₂ = Temperature of cooling water, and T₃ = Evaporator temperature) [T₃ (T₂ - T₃)] / [T₁ (T₁ - T₂)] [T₃ (T₁ - T₂)]/ [T₁ (T₂ - T₃)] [T₁ (T₂ - T₃)] / [T₃ (T₁ - T₂)] [T₁ (T₁ - T₂)] / [T₃ (T₂ - T₃)] TRUE ANSWER : ? YOUR ANSWER : ?
Air refrigerator works on Reversed Carnot cycle None of these Both (A) and (B) Bell Coleman cycle TRUE ANSWER : ? YOUR ANSWER : ?