Topics: All categories in the pool
1: Doors communicating with outside from a mechanical room must be?
- Steel, approved, weather-stripped
- Self-closing, wooden, fire door
- Self-closing, approved, fire door
- Self-closing, aligned, fire door
2: 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
3: Fractionation occurs when
- the pressures decreases as the heat load decreases
- the pressures increase as the heat load increases
- some of the blended refrigerant evaporates or condenses before the rest of the blend
- when a fraction of refrigerant is added as the full charge
4: The first step in mechanical refrigeration is
- condensation
- expansion
- compression
- evaporation
5: What is a Category "M" fluid?
- 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
- 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
- Any fluid that exceeds 150 psig and has design temperatures over 366F
6: The equivalent length of pipe in a water piping system is
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it
- the total length of pipe as you would measure it plus 25% for fittigns
- the total length of pipe plus equivalent of fittings multiplied by 2.31
7: 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
8: Suction line oil traps should be installed when the condenser is
- located outside the operates in temperatures below 35F
- more than 100' away from the evaporator
- in the basement and the evaporator is on the third floor
- on the third floor roof and the evaporator is in the basement
9: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low-ambient controller
- low pressure switch
- thermostat
10: In a motor, an internal overload might open if
- there's an open start winding
- there's an excess current draw through the motor
- there was a high pressure refrigerant was used for a low pressure system.
- there's a direct short
11: What is the minimum size wire you can use on a 30 amp circuit?
- 10 AWG
- 16 AWG
- 14 AWG
- 12 AWG
12: The gauge thickness required on a CO2 tank construction is
- 5/16"
- 3/32"
- 1/16"
- 1/8"
13: Dew point is
- the temperature above which water vapor in the air will start to condense
- the temperature of air of 50% RH
- the temperature below which water vapor in the air will start to evaporate
- the temperature below which water vapor in the air will start to condense
14: 746 watts is equal to
- 10 hp
- 100 hp
- 1 hp
- Pi
15: pressure relief valves must discharge to the atmosphere at a location not less than 15 feet from ground level and ____ feet from any window, ventilation opening, or exits of buildings.
- 20
- 15
- 10
- 25
16: How many gallons of water do you need per pound of ammonia?
- 100
- 50
- 1
- 10
17: What is a megaohm meter?
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- 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 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
18: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- the same
- higher
- there is no Group B1 refrigerants
- lower
19: A premise or that portion of a premise where people transact business, receive personal service, or purchase foods, other goods is considered a
- public assembly occupancy.
- business occupancy
- commercial occupancy
- mercantile occupancy
20: How many refrigerant classifications are there for toxicity?
- 5
- 3
- 1
- 2
21: A movie theater would be considered a
- institutional occupancy
- mixed occupancy
- commercial occupancy
- public assembly occupancy
22: The start winding has _____ turns than the run winding.
- more
- less
- the same
- none of the above
23: Watt's Law indicates Volts X Amps = _________.
- Resistance
- Current
- Watts
- Ohms
24: "I" represents ____ in the Ohm's law formula.
- resistance
- amperage
- capacitance
- voltage.
25: Relief valves are rated in
- pounds of air per hour
- pounds of air per minute
- gallons of water per hour
- gallons of water per minute