MR Random 2

Diminishing quality of indoor air is due to --·

• reduced infiltration of outdoor air
• vapors released from new building materials
• Both A and B.
• Neither A nor B.
• 529

Resistance is measured in

• Coulombs
• amperes
• ohms
• farads
• 225

How can the refrigerant temperature in an air-cooled condenser be estimated?

• By adding 30°F to 35°F to the ambient temperature of air around the condenser
• By subtracting 25°F from the present condenser temperature
• By placing a temperature probe inside the suction line
• None of the above.
• 153

Which instrument measures only the true power consumed by an electrical load?

• Power factor meter
• Wattmeter
• Voltmeter
• Ohmmeter
• 365

The total recovery cylinder weight is equal to the maximum refrigerant weight plus the __of the cylinder.

• specific gravity
• water weight
• tare weight
• density
• 204

Which of the following statements regarding a low-side float system is not true?

• The evaporator has a large receiver that holds liquid refrigerant.
• The float can be a sealed ball or an open pan.
• The high-side and low-side pressures balance during the Off cycle.
• These systems are often referred to as flooded systems.
• 417

Which of the following is the best test a technician can perform to see if the thermostat is the cause of a no-start condition?

• Bypass the thermostat. If the system does not start, the problem is in the thermostat.
• Bypass the thermostat. If the system starts, the problem is in the thermostat.
• Turn the thermostat to its highest setting. If the system does not start, the problem is in the thermostat.
• Turn the thermostat to its lowest setting. If the system does not start, the problem is in the thermostat.
• 492

The type of metering device most commonly used in domestic refrigerators or freezers is the

• electronic expansion valve
• automatic expansion valve
• thermostatic expansion valve
• capillary tube
• 472

The purpose of a purge unit is to__.

• bypass the compressor when the cut-out temperature is reached
• increase the speed at which the system can be evacuated
• prevent excessive pressure from building on the high side
• remove noncondensables from the system
• 614

According to Ohm's law, if a circuit's resistance is 5 Q and the voltage applied is 100 V, what is the current?

• 500 A
• 0.05 A
• 115 A
• 20A
• 226