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Heat transfer
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 ⇒ A boot-strap air cooling system has. two heat exchangers [other wrong options] [Discuss in forum] one heat exchanger three heat exchangers four heat exchangers |
Q22 ⇒ The by-pass factor of a cooling coil decreases with. decrease in fin spacing and increase in number of rows [other wrong options] [Discuss in forum] increase in fin spacing and increase in number of rows increase in fin spacing and increase in number of rows decrease in fin spacing and decrease in number of rows |
Q23 ⇒ The alignment circle is marked on the psychrometric chart at. 26°C DBT and 50% RH [other wrong options] [Discuss in forum] 20°C DBT and 50% RH 20°C DBT and 60% RH 26°C DBT and 60% RH |
Q24 ⇒ 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 |
Q25 ⇒ In a refrigerating machine, heat rejected is __________ heat absorbed. greater than [other wrong options] [Discuss in forum] equal to less than none of these. |
Q26 ⇒ The thermal diffusivity for gases is generally __________ those for liquids. greater than [other wrong options] [Discuss in forum] equal to less than none of these. |
Q27 ⇒ A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called. low side float valve [other wrong options] [Discuss in forum] automatic expansion valve high side float valve thermostatic expansion valve |
Q28 ⇒ The optimum effective temperature for human comfort is. lower in winter than in summer [other wrong options] [Discuss in forum] higher in winter than in summer same in winter and summer not dependent on season |
Q29 ⇒ Reynolds number is the ratio of. inertia force to viscous force [other wrong options] [Discuss in forum] energy transferred by convection to that by conduction kinematic viscosity to thermal diffusivity none of the above |
Q30 ⇒ Which of the following statement is correct? all of the above [other wrong options] [Discuss in forum] In vapour absorption refrigerator, the compression of refrigerent is avoided. Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser. In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke. |
Q31 ⇒ An electrolux refrigerator is called a __________ absorption system. three fluids [other wrong options] [Discuss in forum] single fluid two fluids none of these. |
Q32 ⇒ The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity). 22°C DBT and 60% RH [other wrong options] [Discuss in forum] 25°C DBT and 100% RH 20°C DBT and 80% RH 25°C DBT and 40% RH |
Q33 ⇒ The evaporator changes the low pressure liquid refrigerant from the expansion valve into. low pressure vapour refrigerant [other wrong options] [Discuss in forum] high pressure liquid refrigerant low pressure liquid and vapour refrigerant none of these |
Q34 ⇒ The subcooling in a refrigeration cycle. increases C.O.P. [other wrong options] [Discuss in forum] does not alter C.O.P. decreases C.O.P. none of these |
Q35 ⇒ Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since. these react with ozone layer [other wrong options] [Discuss in forum] these react with water vapour and cause acid rain these react with plants and cause green-house effect these react with oxygen and cause its depletion |
Q36 ⇒ The wet bulb temperature during sensible cooling of air. decreases [other wrong options] [Discuss in forum] remains constant increases none of these. |
Q37 ⇒ During humidification process, __________ increases. relative humidity [other wrong options] [Discuss in forum] wet bulb temperature dry bulb temperature specific humidity |
Q38 ⇒ The relative humidity lines on a psychrometric chart are. curved lines [other wrong options] [Discuss in forum] vertical and uniformly spaced horizontal and uniformly spaced horizontal and non-uniformly spaced |
Q39 ⇒ In aqua-ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water in. condenser [other wrong options] [Discuss in forum] evaporator absorber none of these |
Q40 ⇒ Free convection flow depends on. all of these [other wrong options] [Discuss in forum] density coefficient of viscosity gravitational force |
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