Topics: All categories in the pool
1: "R" represents ___ in the Ohm's law formula
- voltage
- amperage
- capacitance
- resistance
2: What would be the classification for Stop & Shop grocery store?
- Instituional
- Large mercantile
- Industrial
- Place of assembly
3: Which creates more of a heat load?
- 30% RH
- 70% RH
- 50% RH
- 90% RH
4: What is considered a cooling agent?
- any liquid used for the transmission of heat when condensation occur
- any liquid used for the transmission of heat without condensation
- any liquid used for the transmission of heat without vaporization
- any liquid used for the transmission of heat when vaporization occurs
5: How much refrigerant can be stored in a mechanical room outside of the system?
- 150
- 200
- 330
- 100
6: What's the purpose of a megohmmeter?
- To measure low to very low resistance values
- To alternate the current in a DC circuit in order to calculate the total impedance of a circuit
- To measure very high resistances
- None of the above
7: Heat that changes the physical state of a substance without effecting a change in its temperature is known as
- lost heat
- latent heat
- sensible heat
- specific heat
8: What is the temperature that a liquid and a vapor can exist in equilibrium called?
- Saturated temperature
- Dry bulb temperature
- Critical temperature
- Wet bulb temperature
9: Ammonia (NH3) is a group III refrigerant
- True
- False
10: 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
- 5 amps
- 15 amps
- 20 amps
11: A low oil switch is typically
- manual reset
- automatic reset
- non used on semi-hermetic compressors over 10 ton capacity
- time-delay auto reset
12: Which refrigerant class listed below is the most flammable?
- A3
- B2
- A2
- C3
13: All low-pressure chillers use which type of compressor?
- Reciprocating
- Scroll
- Centrifugal
- Rotary
14: If the power element of an expansion valve should lose its charge the valve would
- go open
- go closed
- overfeed the evaporator
- underfeed the evaporator
15: 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
16: The principle used in continuous type absorption systems is
- Ohm's Law
- Charles's Law
- Dalton's Law
- Boyle's Law
17: When liquid receivers are used, the liquid refrigerant shall not exceed _______percent of the volume at 90F.
- 75%
- 80%
- 99%
- 90%
18: A VRF system is a direct system
- true
- false
19: Fractionation occurs when
- the pressures decreases as the heat load decreases
- 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
- the pressures increase as the heat load increases
20: The density of a gas refers to
- pounds per square foot
- pounds per absolute pressure
- pounds per cubic foot
- cubic feet per pound
21: What would be the classification of a church?
- Institutional
- Large mercantile
- Place of assembly
- Industrial
22: What should not (and can not) be located between a pressure imposing device and a pressure-limiting device?
- Foot valve
- Stop valve
- Muffler
- Moisture indicator
23: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 96
- 88
- 58
- 38
24: Increasing superheat will do what to your frost line?
- Could either increase or decrease depending on the load conditions
- Decrease
- Nothing
- Increasae
25: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- animal, vegetable, and castor
- animal, vegetable, and mineral
- naphthalene, mixed, and paraffin