🔥 Heat Transfer, Refrigeration & Air Conditioning MCQ Questions and Answers with Live Score

Practice 100+ important MCQs from Heat Transfer, Refrigeration and Air Conditioning covering conduction, convection, radiation, heat exchangers, refrigeration cycles, COP, and psychrometrics

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🔥 Heat Transfer, Refrigeration & Air Conditioning MCQ Questions and Answers (1–100)

These MCQ questions cover key concepts of Heat Transfer, Refrigeration and Air Conditioning including conduction, convection, radiation, heat exchangers, vapour compression refrigeration cycle, COP, psychrometrics, and air conditioning systems. These questions are highly important for GATE, IES, SSC JE, RRB, and other Mechanical Engineering exams.

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Question 1: In steady-state one-dimensional heat conduction through a plane wall with constant thermal conductivity and no heat generation, what is the temperature distribution across the wall?

Question 2: In a composite wall, the equivalent thermal resistance is determined by which principle?

Question 3: In forced convection over a flat plate, the boundary layer thickness increases with distance from the leading edge because?

Question 4: In radiation heat transfer, emissivity of a surface is defined as?

Question 5: In a vapour compression refrigeration system, the primary function of the condenser is to?

Question 6: In refrigeration cycles, coefficient of performance (COP) is defined as?

Question 7: In psychrometrics, relative humidity is defined as?

Question 8: In heat exchangers, effectiveness is defined as?

Question 9: In steady radial heat conduction through a cylinder, temperature distribution is?

Question 10: In critical radius of insulation for a cylinder, heat loss increases until?

Question 11: In transient heat conduction, the Biot number represents which physical significance?

Question 12: In blackbody radiation, the wavelength corresponding to maximum emission is governed by which law?

Question 13: In a vapour compression refrigeration cycle, throttling process is ideally?

Question 14: In convective heat transfer, Nusselt number signifies?

Question 15: In refrigeration, subcooling of liquid refrigerant results in?

Question 16: In heat exchangers, logarithmic mean temperature difference (LMTD) is used when?

Question 17: In psychrometric processes, sensible heating refers to?

Question 18: In thermal radiation, a gray body is defined as?

Question 19: In a refrigeration cycle, superheating of vapor before compression leads to?

Question 20: In heat transfer, Fourier’s law relates heat flux to?

Question 21: In free convection, heat transfer is mainly due to?

Question 22: In a vapour absorption refrigeration system, the compressor is replaced by?

Question 23: In a heat exchanger, fouling factor accounts for?

Question 24: In Stefan-Boltzmann law, total radiation emitted is proportional to?

Question 25: In psychrometrics, wet bulb temperature is measured using?

Question 26: In transient heat conduction of a lumped system, the validity of lumped analysis depends on which condition?

Question 27: In a vapour compression refrigeration cycle, increasing the evaporator temperature while keeping condenser temperature constant results in?

Question 28: In forced convection over a flat plate, transition from laminar to turbulent flow depends primarily on?

Question 29: In a refrigeration system, the throttling process leads to cooling because?

Question 30: In radiation exchange between two large parallel plates, the view factor between them is?

Question 31: In psychrometrics, specific humidity is defined as?

Question 32: In a heat exchanger, NTU method is preferred when?

Question 33: In refrigeration, flash gas formed during throttling reduces system efficiency because?

Question 34: In heat conduction, thermal diffusivity represents?

Question 35: In air conditioning, sensible heat factor (SHF) is defined as?

Question 36: In radiation, Kirchhoff’s law states that?

Question 37: In refrigeration cycles, subcooling increases COP primarily because?

Question 38: In forced convection, Prandtl number represents ratio of?

Question 39: In a vapour absorption system, the refrigerant-absorbent pair commonly used is?

Question 40: In heat exchangers, effectiveness approaches unity when?

Question 41: In steady heat conduction through a sphere, heat transfer varies with?

Question 42: In air conditioning, bypass factor of coil represents?

Question 43: In radiation heat transfer, shape factor depends on?

Question 44: In refrigeration, COP of Carnot refrigerator depends on?

Question 45: In convective heat transfer, Grashof number is important in?

Question 46: In refrigeration systems, suction line heat exchanger is used to?

Question 47: In a heat exchanger, parallel flow arrangement results in?

Question 48: In air conditioning, humidification process results in?

Question 49: In steady heat conduction with heat generation in a slab, temperature distribution is?

Question 50: In refrigeration, the ideal vapour compression cycle assumes compressor process to be?

Question 51: In transient heat conduction, the Fourier number represents which physical meaning?

Question 52: In a vapour compression cycle, increasing condenser temperature while keeping evaporator temperature constant will?

Question 53: In forced convection inside a pipe, the flow is considered fully developed when?

Question 54: In thermal radiation, a blackbody is defined as?

Question 55: In refrigeration systems, superheating of suction vapor is done mainly to?

Question 56: In convective heat transfer, Reynolds number signifies?

Question 57: In a heat exchanger, counterflow arrangement provides higher effectiveness because?

Question 58: In psychrometrics, dew point temperature is defined as?

Question 59: In steady heat conduction, thermal conductivity of a material indicates?

Question 60: In refrigeration cycles, the refrigerant should have low boiling point because?

Question 61: In natural convection, Nusselt number depends on?

Question 62: In a vapour compression system, refrigerating effect is defined as?

Question 63: In radiation, emissive power depends on?

Question 64: In air conditioning, latent heat load is associated with?

Question 65: In heat exchangers, capacity ratio is defined as?

Question 66: In conduction through composite cylinder, heat flow depends on?

Question 67: In refrigeration, COP of a system increases when?

Question 68: In convection, heat transfer coefficient depends on?

Question 69: In radiation heat transfer, reflectivity is defined as?

Question 70: In air conditioning, comfort conditions depend mainly on?

Question 71: In transient conduction, time constant of lumped system depends on?

Question 72: In refrigeration, ton of refrigeration is defined as?

Question 73: In conduction with variable thermal conductivity, solution requires?

Question 74: In refrigeration, the purpose of evaporator is to?

Question 75: In heat transfer, steady-state condition implies?

Question 76: In transient heat conduction of a semi-infinite solid suddenly exposed to a higher temperature environment, the temperature profile inside the solid is governed by?

Question 77: In a vapour compression refrigeration system, the isentropic efficiency of compressor affects COP such that?

Question 78: In forced convection over a cylinder, the drag force and heat transfer are strongly influenced by?

Question 79: In radiation exchange between two diffuse gray surfaces, the net heat transfer depends on?

Question 80: In a refrigeration cycle, lowering condenser pressure while keeping evaporator pressure constant leads to?

Question 81: In heat exchangers, when one fluid undergoes phase change, LMTD method becomes less accurate because?

Question 82: In psychrometrics, adiabatic saturation temperature is approximately equal to?

Question 83: In conduction with internal heat generation, maximum temperature occurs where?

Question 84: In refrigeration, throttling process is irreversible because?

Question 85: In forced convection, thermal boundary layer thickness depends on?

Question 86: In a vapour absorption system, generator function is to?

Question 87: In radiation, view factor between a surface and itself is?

Question 88: In heat transfer, contact resistance occurs due to?

Question 89: In refrigeration, cascade systems are used when?

Question 90: In convection, heat transfer coefficient increases with?

Question 91: In steady heat conduction, if thermal conductivity increases with temperature, heat transfer rate will?

Question 92: In air conditioning, infiltration load is caused by?

Question 93: In radiation heat transfer, a polished surface has?

Question 94: In refrigeration, refrigerant selection depends on?

Question 95: In heat exchangers, fouling increases?

Question 96: In conduction through a plane wall, if thickness doubles, heat transfer rate will?

Question 97: In psychrometric chart, enthalpy lines are?

Question 98: In refrigeration, multistage compression is used to?

Question 99: In convection, turbulent flow enhances heat transfer because?

Question 100: In ideal refrigeration cycle, COP becomes maximum when?

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🔥 Heat Transfer, Refrigeration & Air Conditioning MCQ Questions and Answers with Live Score

🔥 Heat Transfer, Refrigeration & Air Conditioning MCQ Questions and Answers (1–100)

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