Topics: All categories in the pool
1: What are the three components of a transformer?
- Primary coil, secondary coil, and copper contacts
- Primary core, secondary coil, and high and low voltage connectors.
- Primary coil, secondary coil, and core
- Contacts, secondary coil, and core
2: An electronic bridge circuit is basically a
- high voltage circuit
- Wheatstone
- suspension
- 24 volt control circuit
3: Machinery rooms must be vented to ______?
- basement
- unoccupied spaces
- outdoors
- neutralizing tank
4: If two 500 ohm resistors are connected in series, the resistance will be
- 1000 ohms
- 200 ohms
- 500 ohms
- 20 ohms
5: A premise where large numbers of people congregate and from which occupants can not quickly vacate the space is considered
- commercial occupancy
- mixed occupancy
- institutional occupancy
- public assembly occupancy
6: On a TXV, the purpose of an external equalizer is to?
- allow a greater adjustment spam
- compensate for a pressure drop across the evaporator coil
- balance the evaporator load
- Increase the pressure on the top of the power head diaphragm
7: If air is present in an absorption chilled water appliance, which of the following will most likely occur?
- Rust can form
- The Li-Br solution will become more concentrated
- The Li-Br solution will become more diluted
- System operating pressure will drop
8: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- far apart or greater difference
- nearly the same
- 2F difference
- a ling psychrometer doesn't have two theremometers.
9: The critical temperature of a refrigerant gas occurs when
- the gas is no longer saturated
- any decrease in pressure will cause condensation
- the gas returns to a liquid
- any increase in pressure will not liquefy the gas
10: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
11: Ammonia shall be discharged into ____________ or a tank containing one gallon of water for every pound of ammonia.
- the atmosphere
- a de-pressurized recovery tank with a silver top and yellow bottom
- a tank containing two pounds of a water/lithium bromide mix for every pound of ammonia
- All of the above
12: Low pressure systems have what kind of compressor?
- Scroll
- Reciprocating
- Rotary
- Centrifugal
13: What must be done if refrigeration lines pass through a concrete floor?
- insulated
- moisture barrier
- installed through a pipe casing
- leak checked
14: Viscosity is
- the ability of oil to flow
- measure of weight
- the coefficient of external friction
- a measure of heat content
15: Stop valves shall not be permitted between the system and the
- service valve
- relief valve
- condenser
- bleed valve
16: copper and its alloys shall not be used in contact with _____ except as a component of bronze alloys for bearing or other non-refrigerant containing uses.
- ammonia
- CFC-11
- Lithium bromide
- HCFC-123
17: When can recovered refrigerants be reused?
- They can't
- Only when used in original owner's equipment
- Only if used in 30 days of recovery
- None of the above
18: The oil separator is always inserted in the system
- where it can be easily serviced
- in a cool spot
- to prevent oil logging
- in the discharge line
19: On cooling towers, what causes the condenser water to drop
- ambient temperatures
- sensible heat
- tower fans
- evaporation of the water droplets
20: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
21: The certificate of inspection
- shall be posted on the compressor shell or electrical panel at the unit
- shall be $20 and an additional fee of $1 for each tone above 20 tons
- shall be authorized by a notarized insurance company
- shall be posted and protected from dirt, water, and other elements
22: Class A refrigerants are considered
- non-flammable
- toxic
- non-toxic
- flammable
23: On a 460V motor, what is he MAXIMUM voltage that can be safely applied to it?
- 506v
- 550v
- 660v
- None of the above
24: High pressure controls should be set no higher than
- 25% of set point
- 90% of set point
- 80% of set point
- 10% of set point
25: What type of material can't be used on the outlet of a relief valve?
- PVC
- Copper
- Magnesium alloy
- Stainless steel