Topics: All categories in the pool
1: If your suction line is warmer than the room temperature, this may indicate
- a low charge
- an over charge
- plugged air filter
- below normal superheat
2: The color code of a tank of ammonia is
- lavender
- light green
- silver
- white
3: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
4: Which winding have the most turns?
- depends on the motor phase
- they have equal amount of turns
- Start
- run
5: A mixed occupancy occurs when two or more occupancies are located with the same building
- true
- false
6: A class A3 refrigerant is considered
- toxic and somewhat flammable
- non-toxic and non-flammable
- non-toxic but highly flammable
- toxic and non-flammable
7: Which of the following is an example of an azeotropic refrigerant?
- R-134A
- R-404A
- R-410A
- R-500
8: Stop valves shall not be permitted between the system and the
- condenser
- bleed valve
- relief valve
- service valve
9: The solution that leaves the concentrator in an absorption chiller is referred to as the
- strong solution
- absorbed solution
- diluted solution
- weak solution
10: Name a reason that does not cause reduced condenser air quantity
- Dirty fan blades
- High ambient temperature
- Prevailing winds
- Dirty Coil
11: A relief valve shall be located at least ___ above grade.
- 10'
- 15'
- 25'
- 36'
12: Ammonia belongs to Group
- B-1
- A-2
- B-2
- A-1
13: Oils, classified as to source, are
- naphthalene, mixed, and paraffin
- animal, vegetable, and castor
- animal, vegetable, and mineral
- naphthalene, paraffin, and castor
14: What is an example of institutional occupancy?
- Shopping mall
- Dorms
- Football stadium
- Hospital
15: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary coil, secondary coil, and core
- Primary core, secondary coil, and high and low voltage connectors.
- Contacts, secondary coil, and core
16: A secondary coolant is defined as
- any refrigerant direcly in contact with the cooling space for process cooling
- 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
- a low temperature refrigerant used for cascading systems
17: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above
18: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 104 ohms
- 71 ohms
- 80 ohms
- 27 ohms
19: In designing duct work, pressure and ______ need to be considered
- length
- CFM
- duct sealant used
- all of the above
20: Refrigeration piping before being buried shall be
- leak tested
- encased in pipe duct
- pressure tested
- All of the above
21: 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 the occupied space
- is such that a leak of refrigerant from a failed connection will enter an unoccupied space
22: Starting relays for a single phase compressors are used to remove the starting circuit from operation when the motor reaches approximately ____ percent of its speed.
- 24
- 75
- 50
- 100
23: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a high DC voltage signal into the object being tested
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter that measures very high resistance values by sending a low voltage AC signal into the object being tested
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
24: A line voltage thermostat controls a 1,200 watt strip header at 120 volts. What must be minimum ampere rated of the stat be?
- 10 amps
- 20 amps
- 5 amps
- 15 amps
25: If the dry bulb temperature is 85F and the wet bulb temperature is 70F, the dew point temperature will be approximately (use psychometric chart)
- 70F
- 77F
- 32F
- 58F