MCQ on Refrigeration and Air Conditioning

Rajasthan Polytechnic Third Year Paper 2016 – Refrigeration and Air Conditioning

Cofficient of performance of heat pump is
(a) Refrigerating effect/ Network
(b) Network/ Refrigerating effect
(c) (Refrigerating effect+ Neetwork)/Network
(d) Network/ (Refrigerating effect+ Neetwork)

Refrigeration produced in water from porous earthen pot is
(a) Refrigeration by evaporation
(b) Ice refrigeration
(c) Air refrigeration
(d) Vapour absorption refrigeration

The fulids used in Electrolux refrigerator are
(a) Water and Hydrogen
(b) Ammonia and Hydrogen
(c) Only Ammonia
(d) Ammonia, Water and Hydrogen

In which port of vapour compression refrigeration system enthalpy will remain same?
(a) Evaporator
(b) Expansion valve
(c) Condenser
(d) Compressor

In a simple saturated vapour compression refrigeration cycle the following result are obtained
Enthalpy before compression = 375 kJ/kg
Enthalpy after compression = 425 kJ/kg
Enthalpy after condensation = 125 kJ/kg
Co-efficient of performance will be
(a) 0.2
(b) 2
(c) 6
(d) 5

Bell Coleman air refrigeration cycle consist of following thermodynamic process
(a) two adiabatic and two constant volume process
(b) two isothermal and two constant volume process
(c) two adiabatic and two constant pressure process
(d) two isothermal and two constant pressure process

Ratio of higher temperature and lower temperature of a Carnot refrigeration cycle is 1.25. The value of coefficient of performance will be
(a) 4
(b) 5
(c) 3
(d) 2

In adiabatic humidification process which statement is wrong related to air properties?
(a) Wet bulb temperature decrease
(b) Dry bulb temperature decrease
(c) Wet bulb temperature will same
(d) Enthalpy will remain same

Dry ice is
(a) free from water
(b) solid carbon dioxide
(c) free from air and gases
(d) does not contain impurities

Which refrigerant is inorganic compound?
(a) Ethane
(b) Ethly chloride
(c) Carbon dioxide
(d) Ethylene