Worksheets07. ACR-105 UNIT 14 PRACTICE TEST
Total questions: 10
Worksheet time: 5mins
In both the heating and cooling function, a thermostat is functioning on a ________.
drop in pressure
drop in temperature
rise in temperature
rise in pressure
A low-voltage thermostat normally regulates other controls and does not carry much current, typically around 10 amps or less.
True
False
To get a more accurate reading when using a bulb-type thermometer on a flat surface, _________.
the thermometer should be kept in a vertical position
the bulb should be immersed in liquid first
the thermometer should be kept in a horizontal position.
insulation should be place over the bulb
Most hermetic compressors are cooled by ________.
passing air over the motor
suction gas passing through the motor
water running over the compressor shell
using a timed off-cycle to allow the motor cool
The term fluid applies to both the liquid and vapor states of matter.
True
False
The pressure at which a pressure control will interrupt an electrical circuit is called the _________.
cut-in
differential
switch pressure
cut-out
In the HVAC/R field, both temperature and pressure controls incorporate cut-out, cut-in, and differential adjustments.
True
False
A device that measures pressure and then converts the sensed pressure into an electronic signal is a(n) __________.
digital thermometer
high pressure control
low pressure control
pressure transducer
A(n) __________ is used to ensure that the compressor has oil pressure when operating.
low pressure control
high pressure control
oil pressure safety control
snap-disc oil control
Electromechanical controls convert a mechanical movement into some type of heat energy.
True
False
