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Refrigeration and air conditioning
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The thermostatic expansion valve is used in __________ type of evaporators. dry [other wrong options] [Discuss in forum] flooded DX coil none of these. |
Q22 ⇒ The capillary tube, as an expansion device, is used in. all of these [other wrong options] [Discuss in forum] domestic refrigerators water coolers room air conditioners |
Q23 ⇒ According to Newton's law of cooling, the heat transfer from a hot body to a cold body is. both (a) and (b) [other wrong options] [Discuss in forum] directly proportional to the surface area directly proportional to the difference of temperatures between the two bodies either (a) or (b) |
Q24 ⇒ The refrigerant supplied to a compressor must be. superheated vapour refrigerant [other wrong options] [Discuss in forum] dry saturated liquid refrigerant a mixture of liquid and vapour refrigerant none of these |
Q25 ⇒ The drier in a refrigeration system removes moisture in the system. Correct [other wrong options] [Discuss in forum] Incorrect Both (a) and (b) None of these |
Q26 ⇒ The critical thickness of insulation is the ratio of thermal conductivity of the insulating material (k) to the heat transfer coefficient at the outer surface of the insulation (h0). True [other wrong options] [Discuss in forum] False Both (a) and (b) None of these |
Q27 ⇒ Upto the critical radius of insulation, added insulation will increase heat loss [other wrong options] [Discuss in forum] added insulation will decrease heat loss convective heat loss will be less than conductive heat loss heat flux will decrease |
Q28 ⇒ The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called. degree of saturation [other wrong options] [Discuss in forum] humidity ratio relative humidity absolute humidity |
Q29 ⇒ The reciprocating refrigerant compressors are very suitable for. small displacements and high condensing pressures [other wrong options] [Discuss in forum] small displacements and low condensing pressures large displacements and high condensing pressures large displacements and low condensing pressures |
Q30 ⇒ The refrigerant widely used in domestic refrigerators is R-12 [other wrong options] [Discuss in forum] ammonia carbon dioxide sulphur dioxide |
Q31 ⇒ The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called relative humidity [other wrong options] [Discuss in forum] humidity ratio absolute humidity degree of saturation |
Q32 ⇒ The average value of thermal conductivity for water at 20° C saturate is about 0.51. True [other wrong options] [Discuss in forum] False Both (a) and (b) None of these |
Q33 ⇒ Dew point temperature is the temperature of air recorded by a thermometer, when the moisture present in it begins to condense. Correct [other wrong options] [Discuss in forum] Incorrect Both (a) and (b) none of these |
Q34 ⇒ The relative humidity __________ as air gets drier. increases [other wrong options] [Discuss in forum] decreases both (a) and (b) none of these. |
Q35 ⇒ Fourier's law of heat conduction gives the heat flow for. one dimensional cases only [other wrong options] [Discuss in forum] irregular surfaces non-uniform temperature surfaces two dimensional cases only |
Q36 ⇒ An evaporator is also known as. all of these [other wrong options] [Discuss in forum] freezing coil cooling coil chilling coil |
Q37 ⇒ The unit of Stefan-Boltzmann constant is. Watt/m2K4 [other wrong options] [Discuss in forum] Watt/mK Watt/m2K2 Watt/mK2 |
Q38 ⇒ The human body feels comfortable when the heat stored in the body is. zero [other wrong options] [Discuss in forum] positive negative none of these |
Q39 ⇒ The undesireable property of a refrigerant is. high boiling point [other wrong options] [Discuss in forum] non-toxic non-flammable non-explosive |
Q40 ⇒ During sensible cooling, partial pressure of vapour remains constant [other wrong options] [Discuss in forum] relative humidity remains constant wet bulb temperature increases specific humidity increases |
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