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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. |
| Q1 ⇒ Most air cooled condensers are designed to operate with a temperature difference of 14°C [other wrong options] [Discuss in forum] |
| Q2 ⇒ Logarithmic mean temperature difference is the same as the arithmetic mean temperature difference. Disagree [other wrong options] [Discuss in forum] |
| Q3 ⇒ The relative humidity is defined as. 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 [other wrong options] [Discuss in forum] |
| Q4 ⇒ The condition of refrigerant after passing through the condenser in a vapour compression system is saturated liquid [other wrong options] [Discuss in forum] |
| Q5 ⇒ The total radiation from a black body per second per unit area is __________ fourth power of the absolute temperature. This statement is known as Stefan-Boltzmann law. directly proportional to [other wrong options] [Discuss in forum] |
| Q6 ⇒ In air-conditioning of aeroplanes, using air as a refrigerant, the cycle used is reversed Brayton cycle [other wrong options] [Discuss in forum] |
| Q7 ⇒ Thermal conductivity of water __________ with rise in temperature. may increase or decrease depending upon temperature [other wrong options] [Discuss in forum] |
| Q8 ⇒ The heat of sun reaches to us according to. radiation [other wrong options] [Discuss in forum] |
| Q9 ⇒ The critical radius is the insulation radius at which the resistance to heat flow is. minimum [other wrong options] [Discuss in forum] |
| Q10 ⇒ In a psychrometric chart, specific humidity (moisture content) lines are horizontal and uniformly spaced [other wrong options] [Discuss in forum] |
| Q11 ⇒ The curved lines on a psychrometric chart indicates. relative humidity [other wrong options] [Discuss in forum] |
| Q12 ⇒ The coefficient of performance (C.O.P.) is the reciprocal of the efficiency of a heat engine. True [other wrong options] [Discuss in forum] |
| Q13 ⇒ Which of the following refrigerant has the highest freezing point. Carbon dioxide [other wrong options] [Discuss in forum] |
| Q14 ⇒ Wein's law states that the wave length corresponding to __________ is proportional to the absolute temperature. maximum energy [other wrong options] [Discuss in forum] |
| Q15 ⇒ The use of heat exchangers is made in. all of the above [other wrong options] [Discuss in forum] |
| Q16 ⇒ The pressure at the inlet of a refrigerant compressor is called. suction pressure [other wrong options] [Discuss in forum] |
| Q17 ⇒ Which of the following refrigerant has the lowest freezing point? R-22 [other wrong options] [Discuss in forum] |
| Q18 ⇒ The absolute humidity is the mass of water vapour present in 1 m3 of dry air. Agree [other wrong options] [Discuss in forum] |
| Q19 ⇒ The specific humidity during heating and humidification process. increases [other wrong options] [Discuss in forum] |
| Q20 ⇒ A refrigerant compressor is used to. all of the above [other wrong options] [Discuss in forum] |
| Or |