MCQ 1 Which of the following represents a heat pump?
MCQ 2 The heat transfer by conduction through a thick sphere is same as through a thick cylinder.
MCQ 3 The wet bulb temperature lines, on the psychrometric chart, are curved lines.
MCQ 4 The heat transfer takes place according to
MCQ 5 The sensible heat factor during the heating and humidification process is given by (where h1 = Enthalpy of air entering the heating coil, h2 = Enthalpy of air leaving the heating coil, and hA = Enthalpy of air at the end of humidification process)
MCQ 6 During sensible cooling of air __________ decreases.
MCQ 7 The water, alcohol and ammonia have same refrigerating effect at different altitudes.
MCQ 8 The freon group of refrigerants are
MCQ 9 Air conditioning means
MCQ 10 Fouling factor is used
MCQ 11 Which of the following statement is correct for ammonia as a refrigerant?
MCQ 12 The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.
MCQ 13 The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative humidity)
MCQ 14 The dry bulb temperature lines, on the psychrometric chart are
MCQ 15 In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
MCQ 16 The lowest thermal diffusivity is of
MCQ 17 Environmental protection agencies advice against the use of chloro-fluoro-carbon refrigerants since
MCQ 18 A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour into it, is called
MCQ 19 During sensible heating of air, specific humidity remains constant.
MCQ 20 The ratio of emissive power of a body to the emissive power of a perfectly black body is called emissivity.
MCQ 21 The pressure at the outlet of a refrigerant compressor is called
MCQ 22 Sulphur dioxide has the lowest boiling point.
MCQ 23 In counter-current flow heat exchanger, the logarithmic temperature difference between the fluids is __________ as compared to parallel flow heat exchanger.
MCQ 24 The capacity of the cooling tower and spray ponds __________ as the wet bulb temperature of air decreases.
MCQ 25 A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)
