Which of the following steps is not a step in the startup of a reciprocating or rotary compressor refrigerating system?

Which of the following steps is not a step in the startup of a reciprocating or rotary compressor refrigerating system?

a) Check oil level in the compressor, it should be at or above the centre of the sight glass.
b) Check the setting of high and low pressure cutout switches.
c) Open all shutoff valves in the system except bypass valves used elsewhere in the system.
d) Valves in lines connecting suction gages should be closed.
e) Check oil level in the compressor; it should be below the centre of the sight glass.







Answer: D

When a chiller has stopped due to low water temperature, and the chilled water temperature subsequently rises approximately 5-6°C above the chilled water temperature set point, the:

When a chiller has stopped due to low water temperature, and the chilled water temperature subsequently rises approximately 5-6°C above the chilled water temperature set point, the:

a. Compressor will restart
b. Compressor will require a manual reset
c. Cooling tower fan will restart
d. Cooling tower fan will shut down
e. Condenser pump will restart





Answer: A

To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken?

To avoid liquid slugging in a direct expansion evaporator after shutting down a reciprocating or rotary compressor refrigerating system which of the following measures needs to be taken?

a. Pump down the evaporator
b. Drain the liquid from the evaporator into the high-side
c. Discharge the condenser refrigerant into the evaporator
d. Open all the suction valves on the connecting condenser line
e. Fill the evaporator with refrigerant vapour







Answer: A

If a refrigeration compressor fails to start but the motor is running, which of the following could be a cause?

If a refrigeration compressor fails to start but the motor is running, which of the following could be a cause?

a. The control circuit is open
b. The compressor is seized
c. The coupling is sheared or broken
d. The motor is burned out
e. The starter is defective









Answer: C

A system of regularly scheduled inspections and lubrications along with the adjustments, minor parts replacement and minor repairs necessary to keep the refrigerating plant and equipment in good operating condition is defined as what:

A system of regularly scheduled inspections and lubrications along with the adjustments, minor parts replacement and minor repairs necessary to keep the refrigerating plant and equipment in good operating condition is defined as what:

a. Preventive maintenance
b. Repair maintenance
c. Routing operation
d. Regular maintenance
e. Troubleshooting








Answer: A

Which of the following steps is not part of the start-up procedure of a centrifugal compressor refrigerating system?

Which of the following steps is not part of the start-up procedure of a centrifugal compressor refrigerating system?

a. Operate the oil pump for at least ten (10) minutes before starting the compressor
b. Open the stop valves in the chilled water system
c. Open the main circuit breakers
d. Open the makeup water valve
e. Check the refrigerant levels







Answer: C

A safety control designed to protect the chiller from freezing is the:

A safety control designed to protect the chiller from freezing is the:

a. Vane closed switch
b. Low oil pressure shut down switch
c. Motor demand limiter
d. Chilled water flow switch
e. Purge unit







Answer: D

An entire centrifugal compressor refrigerating system, including the auxiliary equipment, can be stopped by simply pressing a stop button, unless

An entire centrifugal compressor refrigerating system, including the auxiliary equipment, can be stopped by simply pressing a stop button, unless

a. The system is automatically controlled
b. The system's auxiliary equipment is not electrically interlocked
c. The system's auxiliary equipment can be stopped simultaneously
d. The compressor can be shut down at the same time as the other equipment
e. There is a cooling demand that must be satisfied







Answer: B

Electrical starters and contractors should be inspected

Electrical starters and contractors should be inspected 

a. Daily
b. Weekly
c. Monthly
d. Semi-annually
e. Annually








Answer: E

The safety control of a centrifugal compressor, that ensures the compressor only starts under a no-load condition is called the

The safety control of a centrifugal compressor, that ensures the compressor only starts under a no-load condition is called the

a. Low Oil Pressure Cut out Switch
b. Condenser High Pressure Cut out
c. Chilled Water Flow Switch
d. Motor demand limiter
e. Vane closed switch








Answer: E

Over charging the system with refrigerant will create:

Over charging the system with refrigerant will create:

a. The formation of bubbles in the sight glass
b. A high discharge condition
c. A low-pressure suction condition
d. The formation of frost at the compressor inlet
e. A low oil pressure condition







Answer: B

Which of the following steps is not part of a start-up of a reciprocating or rotary compressor refrigerating system?

Which of the following steps is not part of a start-up of a reciprocating or rotary compressor refrigerating system?

a. Check for proper oil level in the compressor
b. All shutoff valves in the system should be open
c. Open shutoff valves in the cooling water supply and return lines of water-cooled condensers
d. Valves in pressure page piping should be closed
e. Check the setting of high and low pressure cut out switches







Answer: D

When some refrigeration systems are to be shut down for a prolonged period of time they should be "pumped down" and the refrigerant stored in the:

When some refrigeration systems are to be shut down for a prolonged period of time they should be "pumped down" and the refrigerant stored in the:

a. Evaporator
b. Condenser
c. Receiver
d. Compressor
e. Supply cylinders







Answer: C

If the chilled water temperature drops approximately 2.5-3°C below the chilled water temperature set point, the chilled water low temperature cut out will:

If the chilled water temperature drops approximately 2.5-3°C below the chilled water temperature set point, the chilled water low temperature cut out will:

a. Start the compressor
b. Shut down the compressor
c. Stop the chilled water pumps
d. Shut down the cooling tower fan
e. Start the condenser pump







Answer: B

The chilled water flow switch prevents the:

The chilled water flow switch prevents the:

a. Cooling tower fan from starting if chilled water flow has not been established
b. Cooling tower fan from starting if cooling water flow has not been established
c. Refrigeration compressor from starting if chilled water flow has not been established
d. Refrigeration compressor from starting if cooling water flow has not been established
e. Refrigeration compressor from starting if cooling tower fan has not been started







Answer: C

When pumping down a refrigeration system it is recommended to leave _______ residual pressure in the system to prevent air being drawn in through minor leaks or compressor shaft seals.

When pumping down a refrigeration system it is recommended to leave _______ residual pressure in the system to prevent air being drawn in through minor leaks or compressor shaft seals. 

a. 7 to 15 kPa abs
b. 5 to 15 kPa abs
c. 4 to 14 kPa abs
d. 7 to 14 kPa abs
e. 10 to 20 kPa abs








Answer: D