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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. |
| Q1 ⇒ In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the. Prandtl number, Grashoff's number [other wrong options] [Discuss in forum] |
| Q2 ⇒ As relative humidity decreases, the dew point temperature will be __________ wet bulb temperature. lower than [other wrong options] [Discuss in forum] |
| Q3 ⇒ The heat transfer takes place according to. Second law of thermodynamics [other wrong options] [Discuss in forum] |
| Q4 ⇒ A refrigeration system. removes heat from a low temperature body and delivers it to a high temperature body [other wrong options] [Discuss in forum] |
| Q5 ⇒ The curved lines on a psychrometric chart indicates. relative humidity [other wrong options] [Discuss in forum] |
| Q6 ⇒ The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to. -1/3 [other wrong options] [Discuss in forum] |
| Q7 ⇒ The by-pass factor for a cooling coil. increases with increase in velocity of air passing through it [other wrong options] [Discuss in forum] |
| Q8 ⇒ Which of the following statement is correct for ammonia as a refrigerant? all of these [other wrong options] [Discuss in forum] |
| Q9 ⇒ In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s. The sensible heat factor for the process will be. 0.6 [other wrong options] [Discuss in forum] |
| Q10 ⇒ Which of the following refrigerant has the lowest freezing point? R-22 [other wrong options] [Discuss in forum] |
| Q11 ⇒ The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is. equal to one [other wrong options] [Discuss in forum] |
| Q12 ⇒ The superheated vapour region, in a pressure enthalpy chart, is represented by the space. between the saturated liquid line and saturated vapour line [other wrong options] [Discuss in forum] |
| Q13 ⇒ The temperature of ammonia after compression in a vapour compression system is. 70 to 110° C [other wrong options] [Discuss in forum] |
| Q14 ⇒ The thermostatic expansion valve is used in __________ type of evaporators. dry [other wrong options] [Discuss in forum] |
| Q15 ⇒ For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is __________ that for counter flow. equal to [other wrong options] [Discuss in forum] |
| Q16 ⇒ The condition of refrigerant as it leaves the compressor in a vapour compression system is. superheated vapour [other wrong options] [Discuss in forum] |
| Q17 ⇒ Thermal diffusivity of a substance is. all of the above [other wrong options] [Discuss in forum] |
| Q18 ⇒ In a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is. high pressure saturated liquid [other wrong options] [Discuss in forum] |
| Q19 ⇒ Which of the following statement is correct? At thermal equilibrium, the emissivity and absorptivity are same. [other wrong options] [Discuss in forum] |
| Q20 ⇒ In chemical dehumidification process, all of these [other wrong options] [Discuss in forum] |
| Or |