Multiple Choice Questions on Heat Transfer, Refrigeration and Air ConditioningThe Following Section consists of Multiple Choice Questions on Heat Transfer, Refrigeration and Air Conditioning.
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Heat Transfer, Refrigeration and Air Conditioning MCQ
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Question 1 of 20
1. Question
1 pointsWhich of the following statement is wrong?
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Question 2 of 20
2. Question
1 pointsIn free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
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Question 3 of 20
3. Question
1 pointsThe by-pass factor for a cooling coil
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Question 4 of 20
4. Question
1 pointsThe formation of frost on cooling coils in a refrigerator
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Question 5 of 20
5. Question
1 pointsThe difference between dry bulb temperature and wet bulb temperature, is called
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Question 6 of 20
6. Question
1 pointsIn aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively
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Question 7 of 20
7. Question
1 pointsThe optimum effective temperature for human comfort is
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Question 8 of 20
8. Question
1 pointsThermal diffusivity is a
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Question 9 of 20
9. Question
1 pointsIn 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
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Question 10 of 20
10. Question
1 pointsThe amount of radiation mainly depends upon the
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Question 11 of 20
11. Question
1 pointsFor ammonia refrigerating systems, the tubes of a shell and tube condenser are made of
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Question 12 of 20
12. Question
1 pointsThe highest thermal diffusivity is of
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Question 13 of 20
13. Question
1 pointsWhile designing the refrigeration system of an aircraft, the prime consideration is that the
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Question 14 of 20
14. Question
1 pointsThe heat transfer takes place according to
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Question 15 of 20
15. Question
1 pointsThermal conductivity of water __________ with rise in temperature.
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Question 16 of 20
16. Question
1 pointsDuring adiabatic saturation process on unsaturated air __________ remains constant.
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Question 17 of 20
17. Question
1 pointsThe thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is
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Question 18 of 20
18. Question
1 pointsA perfect black body is one which
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Question 19 of 20
19. Question
1 pointsDuring a refrigeration cycle, heat is rejected by the refrigerant in a
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Question 20 of 20
20. Question
1 pointsA refrigeration system
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Heat Transfer, Refrigeration and Air Conditioning MCQ 2
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Question 1 of 20
1. Question
1 pointsDuring sensible cooling of air __________ decreases.
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Question 2 of 20
2. Question
1 pointsThe subcooling in a refrigeration cycle
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Question 3 of 20
3. Question
1 pointsThe critical radius is the insulation radius at which the resistance to heat flow is
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Question 4 of 20
4. Question
1 pointsThe temperature of ammonia after compression in a vapour compression system is
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Question 5 of 20
5. Question
1 pointsThe centrifugal compressors are generally used for refrigerants that require
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Question 6 of 20
6. Question
1 pointsThe automobile radiator is a heat exchanger of
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Question 7 of 20
7. Question
1 pointsA heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be
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Question 8 of 20
8. Question
1 pointsThe curved lines on a psychrometric chart indicates
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Question 9 of 20
9. Question
1 pointsDuring humidification process, __________ increases.
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Question 10 of 20
10. Question
1 pointsA pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be
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Question 11 of 20
11. Question
1 pointsWhich of the following refrigerant has the maximum ozone depletion potential in the stratophere?
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Question 12 of 20
12. Question
1 pointsWhich of the following statement is correct?
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Question 13 of 20
13. Question
1 pointsIn electrolux refrigerator
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Question 14 of 20
14. Question
1 pointsTwo long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be
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Question 15 of 20
15. Question
1 pointsA boot-strap air cooling system has
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Question 16 of 20
16. Question
1 pointsOne tonne of refrigeration (1TR) means that the heat removing capacity is
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Question 17 of 20
17. Question
1 pointsThe boiling point of __________ is -10.5°C.
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Question 18 of 20
18. Question
1 pointsThe operating pressure for refrigerating units using R-12 as a refrigerant is
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Question 19 of 20
19. Question
1 pointsThe superheated vapour region, in a pressure enthalpy chart, is represented by the space
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Question 20 of 20
20. Question
1 pointsThe minimum temperature to which water can be cooled in a cooling tower is
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Heat Transfer, Refrigeration and Air Conditioning MCQ 3
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Question 1 of 20
1. Question
1 pointsThe index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
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Question 2 of 20
2. Question
1 pointsThe ratio of Nusselt number and the product of Reynold’s number and Prandtl number is equal to
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Question 3 of 20
3. Question
1 pointsThe alignment circle is marked on the psychrometric chart at
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Question 4 of 20
4. Question
1 pointsWhen the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be
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Question 5 of 20
5. Question
1 pointsIf a gas is to be liquified, its temperature must be
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Question 6 of 20
6. Question
1 pointsAccording to Stefan-Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the
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Question 7 of 20
7. Question
1 pointsA good refrigerant should have
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Question 8 of 20
8. Question
1 pointsThe condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is
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Question 9 of 20
9. Question
1 pointsIn case of liquids and gases, the heat transfer takes place according to
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Question 10 of 20
10. Question
1 pointsThe radiation emitted by a black body is known as
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Question 11 of 20
11. Question
1 pointsThe condition of refrigerant as it leaves the compressor in a vapour compression system is
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Question 12 of 20
12. Question
1 pointsThe super-heating in a refrigeration cycle
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Question 13 of 20
13. Question
1 pointsThermal conductivity of a material may be defined as the
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Question 14 of 20
14. Question
1 pointsAir refrigeration cycle is used in
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Question 15 of 20
15. Question
1 pointsReynolds number is the ratio of
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Question 16 of 20
16. Question
1 pointsThe wet bulb depression is zero when relative humidity is
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Question 17 of 20
17. Question
1 pointsIn a saturated air-water vapour mixture, the
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Question 18 of 20
18. Question
1 pointsThe capillary tube is not used in large capacity refrigeration systems because
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Question 19 of 20
19. Question
1 pointsThe freezing point of R-12 is
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Question 20 of 20
20. Question
1 pointsIn a vapour compression system, the condition of refrigerant before entering the expansion or throttle valve is
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Heat Transfer, Refrigeration and Air Conditioning MCQ 4
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Question 1 of 20
1. Question
1 pointsThe refrigerant supplied to a compressor must be
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Question 2 of 20
2. Question
1 pointsThe comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)
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Question 3 of 20
3. Question
1 pointsThe dry bulb temperature lines, on the psychrometric chart are
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Question 4 of 20
4. Question
1 pointsThe pressure at the outlet of a refrigerant compressor is called
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Question 5 of 20
5. Question
1 pointsThe evaporator used in house-hold refrigerators is
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Question 6 of 20
6. Question
1 pointsIn chemical dehumidification process,
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Question 7 of 20
7. Question
1 pointsA one tonne refrigerating machine means that
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Question 8 of 20
8. Question
1 pointsThe air cooling system mostly used in transport type aircrafts is
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Question 9 of 20
9. Question
1 pointsEnvironmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
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Question 10 of 20
10. Question
1 pointsWhen the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by
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Question 11 of 20
11. Question
1 pointsThe by-pass factor of a cooling coil decreases with
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Question 12 of 20
12. Question
1 pointsUpto the critical radius of insulation,
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Question 13 of 20
13. Question
1 pointsThe total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which each constituent would exert, if it occupied the same space by itself. This statement is called
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Question 14 of 20
14. Question
1 pointsA mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
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Question 15 of 20
15. Question
1 pointsThe relative humidity lines on a psychrometric chart are
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Question 16 of 20
16. Question
1 pointsA vapour absorption refrigeration system
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Question 17 of 20
17. Question
1 pointsThe rato of energy transferred by convection to that by conduction is called
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Question 18 of 20
18. Question
1 pointsA designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100° C and leaves at 60° C. A cold fluid enters the heat exchanger at 40° C. The mean temperature difference between the two fluids is
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Question 19 of 20
19. Question
1 pointsThe heat is transferred by conduction, convection and radiation in
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Question 20 of 20
20. Question
1 pointsA thermostatic expansion valve in a refrigeration system
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