Topics: All categories in the pool
1: The actual expansion curve of compressor follows most nearly which one of the following
- Isothermal
- Volume
- Adiabatic
- Pressure-Temperature
2: What type of copper is not permitted on refrigeration systems?
- Type N
- Type M
- Type K
- Type L
3: Which is considered the more efficient condenser?
- spray cooled
- fan cooled
- air cooled
- water cooled
4: "E" represents _____ in the Watt's law formula.
- watts
- amperage
- reactance
- voltage
5: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 88
- 38
- 116
- 108
6: Pi equals approximately
- 3.41
- 3.14
- 12,000
- 746
7: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 16.64
- 3.415
- 34.15
- 6.830
8: Which of the following is an example of an azeotropic refrigerant?
- R-500
- R-134A
- R-410A
- R-404A
9: The measurement of heat in a particular substance is
- latent heat
- enthalpy
- sensible heat
- specific heat
10: A declaration test is needed when the system contains more than
- 110 lbs
- 65 lbs
- 120 lbs
- 55 lbs
11: The level of voltage caused by back electromagnetic force that opens the contacts of a potential relay in order to take the start capacitor out of the circuit is
- boost voltage
- pick up voltage
- run voltage
- lift voltage
12: A VRF system is a direct system
- true
- false
13: A secondary coolant is defined as
- a low temperature refrigerant used for cascading systems
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- any refrigerant direcly in contact with the cooling space for process cooling
14: When air is ducted through a machine room that services occupied space, What must be done?
- Insulated and cross broke
- Ducted and sealed
- Welded and seamed.
- Flanged and gasketed
15: "I" represents _______ in the Watt's law formula.
- reactance
- watts
- amperage
- voltage
16: Gauge pressure is
- absolute pressure
- atmospheric pressure
- what a gauge reads when checking pressures on a chilled water system.
- force of pressure above that of atmospheric
17: What is the leaving chilled water set point for water chiller systems?
- 55F
- 45F
- 66F
- 38F
18: Suction valve unloaders afford an effective means of
- superheat control
- refrigerant control
- capacity control
- evaporator control
19: "P" represents ______ in the Watt's law formula
- watts
- amperage
- voltage
- reactance
20: The dial of a pressure gauge, when installed on the high side of a system be graduated 1.2 times the designed pressure.
- True
- False
21: The discharge relief valve is located (9.4.6)
- between the compressor and the stop valve
- between the compressor and reciever
- on top of the condensor
- between the compressor and oil separator
22: Machinery rooms must be vented to ______?
- outdoors
- unoccupied spaces
- basement
- neutralizing tank
23: A 24 volt transformer with a 240 volt primary can handle how many amps?
- There isn't enough information to answer.
- 10 amps
- 24 amps
- 20 amps
24: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
25: When a refrigeration or air conditioning system is installed
- the form of certificate shall be authorized by the Department of Pubic safety
- a field inspection shall be made before it is put into service
- it shall be approved by the owner for proper operation.
- it shall not be operated below prescribed pressures