The blue gauge and hose on a gauge manifold set are used for:
A) Connecting to refrigerant cylinders.
B) Connecting to vacuum pumps.
C) Reading pressures on the low side of the system.
D) Reading pressures on the high side of the system.
[Ques. 2] What controls the length of the defrost cycle on most commercial refrigeration systems?
A) The defrost termination thermostat B) The evaporator fan motor
C) The high-pressure switch D) The defrost timer
[Ques. 3] The advantage of compliance in a scroll compressor is that:
A) The top of the compressor can be rotated 180 to comply with many refrigerant piping arrangements.
B) The compressor complies with all national compressor standards.
C) The orbiting scroll can separate and unload to pass a small liquid slug.
D) The compressor is very flexible in its application.
[Ques. 4] How does a hot-gas defrost system work?
A) Gas flames provide the heat to melt the ice.
B) A warm glycol solution is sprayed on the coil.
C) The superheated gas leaving the evaporator is used to melt the ice.
D) Hot compressor discharge gas is routed to the evaporator.
[Ques. 5] The smallest increments displayed on most digital gauges are:
A) 1 psi. B) 0.1 psi. C) 5 psi. D) 0.5 psi.
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