Topics: All categories in the pool
1: The difference between saturated liquid and saturated vapor is
- heat
- pressure
- temperature
- volume
2: Which has more turns in the windings: Start windings or Run windings?
- Start windings
- Run windings
- They both have the exact same turns
- Depends on the system and capacitor used
3: The normal operating evaporator temperature of R-410A for air conditioning is typically
- 158F
- 45F
- 155F
- 32F
4: A direct system
- is where the refrigerant comes in contact with the space refrigerated
- is a self-contained complete factory made and tested system
- is on where brine is cooled & circulated to the space refrigerated
- is one which encloses a separate body of evaporative refrigerant
5: 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
6: A Low-Probability System
- 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 can not enter the occupied space
- is such that any leak will cause injury or death to anyone within a 100 square foot area
- is such that a leak of refrigerant from a failed connection will enter the occupied space
7: An air conditioning system rated for 36,000 BTU's is equivalent to
- one ton of cooling
- three tons of cooling
- 12,000 tons of cooling
- two tons of cooling
8: Where is the high-side float located on a chiller system?
- inside the chiller barrel
- liquid line
- discharge line
- flash line
9: Pipe identification labels are required when the system contains more than
- 110 lbs
- 65 lbs
- 55 lbs
- 120 lbs
10: Name a reason that does not cause reduced condenser air quantity
- Dirty fan blades
- High ambient temperature
- Prevailing winds
- Dirty Coil
11: Ohm's Law indicates Amps X Resistance = ___________.
- Current
- Impedance
- Volts
- Ohms
12: If a purge unit fails on a low pressure chiller, what are the symptoms?
- high head pressure
- increased capacity
- low pressure chillers do not have purge units
- low suction pressure
13: Control systems can be classified by
- safety
- economy of operation
- source of power
- tonnage of system
14: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 226 psig, 68 psig
- 365 psig, 120 psig
- 455 psig, 185 psig.
- 257 psig, 77 psig
15: Three-phase motors have what type of windings?
- three run windings and 3 start windings
- three run windings
- three start windings
- one start winding and one run winding.
16: A VRF system is a direct system
- true
- false
17: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the coolest evaporator
- Suction line at the compressor
- Suction line prior to the accumulator of the lowest temperature system
- Suction line of the warmest evaporator
18: All electrical work done on refrigeration systems must comply with
- ASHREA-15 Section 9.2.1
- OSHA
- NEC and Massachusetts Modifications
- Department of Energy
19: It takes how many BTU's of latent heat/hr to boil 1 lbs of water into steam?
- 970 BTU
- 12,000 BTU
- 24,000 BTU
- 144 BTU
20: Lithium-bromide, Li-Br, is best characterized as a
- sand
- soil
- salt
- sugar
21: R-22 falls under which safety classification?
- A-1
- B-2
- A-2
- B-1
22: Low-side system leaks in a low-pressure chiller will often result in
- system refrigerant leaking from the system
- nitrogen leaking out of the system.
- water being pulled into the system
- air being pulled into the system
23: Class 3 refrigerants are
- highly flammable
- non-toxic
- non-flammable
- toxic
24: A halide torch is most useful with a freon compression system
- to sweat flanges on the refrigeration piping
- to remove from from TXV's and evaporator coils
- to release a sticking valve
- to detect refrigeration leaks in piping joints
25: The best way to detect ammonia in brine is
- potassium of line
- CO2 gas
- nessler regaent
- carbonation of soda