Topics: All categories in the pool
1: In a low temperature refrigeration system, the benefit of the system using P.A.G. oil is
- it is hydroscopic
- it traps moisture
- viscosity
- all of the above
2: Who is permitted to access a refrigeration machine room?
- Contractors only
- Anyone, it's a completely safe area
- Any employee
- Authorized persons only
3: What kind of system uses two different refrigerants in separate systems dependent on each other?
- R-414B
- Cascade
- Low pressure
- Simple
4: Halo-carbon refrigerants cannot be used with what material?
- Copper
- Magnesium alloy
- Aluminum
- Stainless Steel
5: Increasing superheat will do what to your system?
- Increase gas flow
- Nothing
- Decrease liquid flow
- Increase liquid flow
6: Group A1 refrigerants over ____ pounds in a system must discharge to the atmosphere
- 330
- 1,000
- 6.6
- 110
7: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low-ambient controller
- low pressure switch
- thermostat
8: A split-phase motor has a ______ winding and a ____ winding
- run, common
- duel-run, duel-start
- start, common
- run, start
9: A Category D fluid
- is when the fluid handled is non flammable, nontoxic, and not damaging to human as defined in ANSI/ASME Process Piping.
- is when the design pressure does not exceed 150 psi
- a fluid for service piping in which the potential for personnel exposure is judged to cause harm and irreversible damage to those persons exposed to it
- Both a and b are correct
10: The best way to detect ammonia in brine is
- CO2 gas
- carbonation of soda
- nessler regaent
- potassium of line
11: One ton of refrigeration is defined as ______ btu/minute.
- 60
- 200
- 720,000
- 12,000
12: A 50 VA control transformer with a 25 volt control output would be rated for _________ amps.
- 2.5
- There isn't enough information to answer.
- 1250
- 2
13: Liquid shall not occupy more than ____ of the volume when the temperature of the refrigerant is 90F.
- 75%
- 80%
- 90%
- 100%
14: A professional or office building would be considered what type of occupancy?
- commercial
- mercantile
- business
- public assembly
15: Volts x amps equals
- Watts
- Impedance
- Inductance
- Ohms Law
16: The test pressure applied to the high side of each factory-assembled refrigerating system shall be at least equal to the design pressure of
- the high side
- the low side
- the aggregate of the high side and low side
- 2.5 times the design pressure
17: According to ASHRAE Standard-15 9.8 Positive Displacement Compressor Protection, the pressure-relief device discharge into
- the low-pressure side of the system
- the high side of the system
- the liquid receiver
- both a and c are correct
18: One watt of electrical energy in a resistive heater will provide _____ BTU/hr
- 6.830
- 3.415
- 16.64
- 34.15
19: Pressure vessels having an inside diameter of 6” or less shall be protected by
- Pressure vessels having an inside diameter of 6” or less need no such protection unless otherwise specified
- a fusible plug
- either a fusible plug or a pressure relief device
- a pressure relief device
20: The proper location for an oil separator is between the
- receiver and metering device
- compressor and condenser
- condenser and receiver
- evaporator and compressor
21: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- fusible plug
- relief plug
- rupture plug
- fusion plug
22: When is the only time you can leave a service container attached to a system?
- Leaking system
- Recovery
- Charging
- Both b and c
23: R-410A is classified as a ____ refrigerant on the safety matrix.
- A-1
- B-1
- B-2
- A-2
24: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 88
- 38
- 58
- 96
25: What is the minimum height refrigeration piping should be placed against walls?
- 6'
- 72"
- 7.25'
- Ceiling height