11) Large sized industrial air-conditioning plant are
a) Air cooled
b) Ground cooled
c) Water Cooled
d) Ammonia cooled
12)Clapeyron equation is a relation between
(a) temperature, pressure and enthalpy
(b) specific volume and enthalpy
(c) temperature and enthalpy
(d) temperature, pressure, and specil volume
(e) temperature, pressure, specific volur and’enthalpy.
Ans: e
13) Which one of the following refrigerants has the highest critical temperature ?
a) Water
b) Carbon dioxide
c) Freon 12
d) Ammonia
14)The boiling point of ammonia is
(a) 100° C
(b) 50° C
(c) 33.3° C
(d) 0°C
Ans: c
15) The correct nomenclature for ethylene is
a) R 150
b) R 740
c) R 1150
d) R 12
16) When there is leakage of ammonia refrigerant, the sulphur stick gives
a) red smoke
b) blue smoke
c) white smoke
d) black smoke
17) The recommemnded material use with Ammonia as a refrigerants is
a) Copper
b) Aluminium
c) Steel
d) Brass
18)In milk chilling plants, the usual secondary refrigerant is
a) Ammonia solution
b) Sodium silicate
c) Glycol
d) Brine
19) An evaporator is also known as
a) freezing coil
b) cooling coil
c) chilling coil
d) all of these
20) Which of the following factor does not affect the condenser capacity ?
a) Material
b) Contact area
c) Temperature difference
d) Rate of natural convection