Topics: All categories in the pool
1: What would be the classification of a prison?
- Institutional
- Place of assembly
- Large mercantile
- Industrial
2: A thermometer inside a duct measures ____ heat.
- latent
- sensible
- specific
- hidden
3: Before replacing a seized compressor, the _______ should be determinded.
- cause of seizure
- current draw
- designed head pressure
- type of refrigerant
4: No open flames are allowed in the machinery room unless?
- Approved by the authorized person
- Only when combustion air is provided from outside of the machinery room
- Approved by the installing contractor
- Never can be allowed
5: A tachometer is an instrument used to measure
- RPM
- air velocity
- static pressure
- speed
6: Low pressure systems have what kind of compressor?
- Scroll
- Rotary
- Centrifugal
- Reciprocating
7: Excessive head pressure is often caused by
- thermostat set too high
- air cooled condenser is plugged
- insufficient refrigerant
- leaking reed valve on the discharge side
8: A direct system
- is one which encloses a separate body of evaporative refrigerant
- is a self-contained complete factory made and tested system
- is where the refrigerant comes in contact with the space refrigerated
- is on where brine is cooled & circulated to the space refrigerated
9: On a TXV, the purpose of an external equalizer is to?
- compensate for a pressure drop across the evaporator coil
- allow a greater adjustment spam
- Increase the pressure on the top of the power head diaphragm
- balance the evaporator load
10: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- 12,000 tons of cooling
- two tons of cooling
- three tons of cooling
11: Liquid level gauges shall have _____________ with one exception being that of the liquid level gauge bull’s eye type.
- color-coded glass to determine type of refrigerant
- moisture indicators
- automatic closing shut-off valves
- All of the above
12: Class T machine room
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
13: If the power element on an expansion valve should lose its charge, the valve would
- Close
- Over feed
- Stay open
- Under feed
14: Before you change the type of refrigerant in a refrigeration system, what three things must be done?
- place sign, check for leaks, insulate
- you can't change refrigerants
- make sure it's compatible, notify owner, notify A.H.J
- nothing must be done
15: The most common type of motor starter is
- part winding starter
- duel-winding starter
- delts-wye starter
- across the line starter
16: What was the main reason for enacting the no venting rule of July 1, 1992?
- Ozone depletion
- Green house effect
- Global warming potential
- All of the above
17: Can you use Ammonia in industrial applications?
- When mixed with R-718
- Yes, Under certain condidtions
- No, never
- Yes, always
18: Can ammonia be used on domestic system?
- no
- no, unless there is proper ventilation system installed
- yes, for systems under 10 tons
- yes
19: Megaohm meters can detect a ground in the
- 10,000,000 ohms or higher
- up to 1,000 ohms
- up to 1,000,000 ohms
- up to 10,000 ohms
20: Heat transferred by conduction from one body to another is done
- via radiation
- via liquids
- via solids
- via heat rays
21: What must be done to refrigerant pipes before being buried?
- Certified
- Leaked checked
- Encased
- Coated
22: While the system is operating, the discharge line should be
- at the same temperature as the crankcase
- 10-15F warmer than ambient
- too hot to hold by hand
- room temperature
23: Crankcase heaters are energized
- when the compressor is off
- to allow easy compressor start-up
- while the compressor is running
- to prevent compressor freeze-up
24: What should never be used in pressure testing refrigeration systems?
- Oxygen
- Compressed air
- Nitrogen
- Both a and b
25: The Board of Boilers adopts by reference
- the MACS Pressure Vessel Code of Massachusetts
- the 1997 ANSI/ASHRAE Safety Code
- Montreal Protocol Safety Code
- MSCA Code