Topics: All categories in the pool
1: 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
- 96
- 38
- 58
2: A High-Probability System
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is a system highly likely to leak form a failed connection or component of such system
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
- is such that a leak of refrigerant from a failed connection will enter the occupied space
3: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution evaporates
- The machine will cool excessively as the solution crystallizes.
- The machine will stop cooling and the solution will evaporate.
4: Suction line oil traps should be installed when the condenser is
- more than 100' away from the evaporator
- on the third floor roof and the evaporator is in the basement
- located outside the operates in temperatures below 35F
- in the basement and the evaporator is on the third floor
5: Low pressure chiller systems use what type of compressor?
- Screw
- Reciprocating
- Scroll
- Centrifugal
6: Brazed joints melt at temperatures above
- 1,000F
- 800F
- 1,200F
- 500F
7: The proper location for an oil separator is between the
- evaporator and compressor
- receiver and metering device
- condenser and receiver
- compressor and condenser
8: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
9: When must refrigeration system covered by the code be inspected?
- Upon installation
- Annually and when installed
- Not required
- Annually
10: If a purge unit fails on a low pressure chiller, what are the symptoms?
- low pressure chillers do not have purge units
- increased capacity
- low suction pressure
- high head pressure
11: All electrical work done on refrigeration systems must comply with
- NEC and Massachusetts Modifications
- ASHREA-15 Section 9.2.1
- OSHA
- Department of Energy
12: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Stop valve
- Muffler
- Foot valve
- Moisture indicator
13: One ton of refrigeration is defined as ______ btu/minute.
- 12,000
- 720,000
- 200
- 60
14: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- of Group B2 refrigerant shall be prohibited
- shall not be prohibited
15: Joints in piping for refrigeration containing parts must withstand temperatures of ___?
- 800F
- 700F
- 600F
- 1000F
16: What is the state of the refrigerant leaving the evaporator?
- low temperature superheated vapor
- a high temperature subcooled liquid
- a low temperature subcooled liquid
- a high temperature superheated vapor
17: Booster compressors connect to the ____ side of the compressor
- vapor
- low side
- oil side
- liquid
18: Each machinery room shall contain
- a toxicity detector where the presence of ammonia or lithium bromide from a leak will concentrate
- smoke and fire alarms as well as three means of egress and that egress must meet 528 CMR ventilation requirements
- a refrigerant detector located in an area where the refrigerant from a leak will concentrate
- high and low pressure controls
19: Pressure vessels nameplate markings must be compliant with the
- ASHRAE 34 Standards
- CMR-588 & CMR-528
- ASME Boiler and Pressure Vessel Code
- All of the Above
20: Which refrigerant replaced R-12?
- R-22
- R-410A
- R-134A
- R-407A
21: Megaohm meters can detect a ground in the
- up to 10,000 ohms
- up to 1,000,000 ohms
- up to 1,000 ohms
- 10,000,000 ohms or higher
22: What is a Category "M" fluid?
- A fluid which is nonflammable, nontoxic, not damaging to human tissues, does not exceed 150 psig, and the designed temperature is between -20F to 366F
- A typical refrigerant used on newer air conditioning and heat pump systems
- A toxic fluid, which can produce serious irreversible harm to persons on breathing or bodily content
- Any fluid that exceeds 150 psig and has design temperatures over 366F
23: On a TXV, the purpose of an external equalizer is to?
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
- compensate for a pressure drop across the evaporator coil
24: A moisture indicator must
- be filled with liquid
- be sight side up
- change color when exposed to moisture
- be yellow
25: Volts x amps equals
- Inductance
- Watts
- Impedance
- Ohms Law