Topics: All categories in the pool
1: The oil separator is always inserted in the system
- in the discharge line
- where it can be easily serviced
- in a cool spot
- to prevent oil logging
2: A compressor in which the increase in vapor pressure is attained without changing the internal volume of the compression chamber is called
- non-volumetric displacement compressor
- neutral chamber-type compressor
- non-positive displacement compressor
- negative displacement compressor
3: Control systems can be classified by
- source of power
- economy of operation
- tonnage of system
- safety
4: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- higher
- the same
- lower
- there is no Group B1 refrigerants
5: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
6: Start to Run windings will have what resistance?
- The least resistance value
- The most resistance value
- Somewhere between the actual start winding and run winding resistance value
- All will be at equal values
7: Usually dry bulb temperature is
- lower than dry bulb temperature
- not important and shall be ignored
- higher than wet bulb temperature
- same as wet bulb temperature
8: The gauge thickness required on a CO2 tank construction is
- 3/32"
- 1/16"
- 5/16"
- 1/8"
9: The main purpose of the accumulator is to
- provide space for vapor to accumulate
- prevent liquid slugs at the compressor
- provide space for the accumulation of oil and containminants
- store liquid refrigerant
10: How many refrigerant classifications are there for flammability?
- 2
- 1
- 3
- 7
11: "E" references ____ in the Ohm's law formula
- amperage
- voltage
- resistance
- capacitance
12: Where is an EPR valve located on a multi-evaporator system?
- Suction line of the warmest evaporator
- Suction line prior to the accumulator of the lowest temperature system
- Suction line at the compressor
- Suction line of the coolest evaporator
13: How many square inches per square foot?
- 64
- 24
- 98
- 144
14: How can you test mechanical strength of an electrical connection?
- measure ohms with an electrical meter
- measure voltage across the connection
- attempt to pull the wire from the connector by hand
- none of the above.
15: R22 and 410A operate at the same range of condensing and evaporating temperatures
- true
- false
16: What is the purpose of a surge capacitor on a contactor?
- to protect low voltage equipment
- to provide smoother start/stops
- to balance the sine waves
- to keep the contactor pulled in
17: Oils, classified as to source, are
- naphthalene, paraffin, and castor
- naphthalene, mixed, and paraffin
- animal, vegetable, and mineral
- animal, vegetable, and castor
18: Low pressure chiller systems use what type of compressor?
- Screw
- Scroll
- Centrifugal
- Reciprocating
19: The critical temperature of a refrigerant gas occurs when
- the gas returns to a liquid
- any decrease in pressure will cause condensation
- the gas is no longer saturated
- any increase in pressure will not liquefy the gas
20: What is a megaohm meter?
- An electric meter that measures very high resistance values by sending a low voltage AC 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
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
21: 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 plus 25% for fittigns
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent of fittings multiplied by 2.31
22: What do you need to do when you install a new system?
- Add refrigerant
- Insulate the suction line before you take a superheat reading
- Document the superheat and subcooling reading
- Have it inspected
23: Large mercantile occupancy is
- a premise of that portion of a premise where more than 50 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise of that portion of a premise where more than 100 persons congregate on levels above of below street level to purchase personal merchandise.
- a premise or that portion of a premise where more than 1500 persons congregate on levels above or below street level to purchase personal merchandise
- a premise or that portion of a premise where more than 200 persons congregate on levels above or below street level to purchase personal merchandise
24: Excessive head pressure is often caused by
- thermostat set too high
- air cooled condenser is plugged
- insufficient refrigerant
- leaking reed valve on the discharge side
25: Which winding have the most turns?
- they have equal amount of turns
- depends on the motor phase
- run
- Start