It is not true that:
a) A humidistat may contain a hygroscopic element
b) A pressurestat maintains a constant pressure in evaporator
c) A thermostatic controller works only by the pressure of its bulb effecting on a connected bellows
d) A bimetal thermostat works only by the change of temperature effect on a bimetal strip
e) A pressure actuated control may be used to control the high pressure cut out of the compressor
Answer: C