Topics: All categories in the pool
1: The freezing point of water at sea level is?
- 32C
- -10C
- 32F
- 0F
2: Fusible plugs must have what marked on them?
- Melting temperature in F
- Melting temperature in C
- Opening pressure
- All of the above
3: The equivalent length of pipe in a water piping system is
- the total length of pipe as you would measure it
- the total length of pipe plus equivalent of fittings multiplied by 2.31
- the total length of pipe plus equivalent-length of fittings
- the total length of pipe as you would measure it plus 25% for fittigns
4: A moisture indicator must
- be sight side up
- be yellow
- be filled with liquid
- change color when exposed to moisture
5: What pipe can not be used for refrigeration?
- L
- M
- N
- K
6: According to the 522 CMR Board of Boilers, refrigerant detectors, alarms, and the refrigeration mechanical room ventilating systems shall be tested
- regularly
- quarterly
- bi-annually
- annually
7: 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.
8: Name a reason that does not cause reduced condenser air quantity
- Dirty Coil
- Prevailing winds
- Dirty fan blades
- High ambient temperature
9: Liquid level gauge glasses shall have automatic closing shut off valves, except Bull's eye or reflex type.
- True
- False
10: In an electrical circuit, what is potential measured in?
- Amps
- Herys
- Volts
- Ohms
11: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- At least 40'
- At least 30'
- There is no minimum for relief valve and windows.
12: Clearance volume
- has no effect on compressor capacity
- affects compressor capacity
- varies depending on compressor speed
- is the same on all compressors
13: Megaohm meters can detect a ground in the
- up to 10,000 ohms
- 10,000,000 ohms or higher
- up to 1,000,000 ohms
- up to 1,000 ohms
14: It takes how many BTU/hr to melt one pound of ice at 32F
- 180
- 212
- 144
- 970
15: Increasing superheat will do what to your frost line?
- Decrease
- Nothing
- Could either increase or decrease depending on the load conditions
- Increasae
16: 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
17: If the suction pressure is low and the evaporator temperature high, the cause will be a?
- compressor suction valve stuck open
- starved evaporator
- too small evaporator
- overcharged
18: Which of the following is not an air velocity meter?
- Anemometer
- Hydrometer
- Velometer
- Anemotherm
19: A relief valve discharge capacity is rated in
- PSIA
- temperature minus pounds of air per second divided by release rate squared
- Pounds of air per minute.
- PSIG
20: Ohm's Law indicates Amps X Resistance = ___________.
- Impedance
- Current
- Volts
- Ohms
21: Which of the following is a drop-in for R-22
- R-410A
- R-134A
- R407C
- None of the above
22: There can be no airflow from an occupied space through a machine room unless what?
- System is high velocity
- System is ducted and sealed
- Duct is not located in the ceiling
- None of the above.
23: A normally operating R-410A system with a condensing temperature of 110F will have a high side pressure of around ______ psig
- 255 psig
- 365 psig
- 125 psig
- 327 psig
24: The absorber shell contains the
- evaporator and the absorber
- condenser and the generator
- condenser, the evaporator, and the generator
- condenser and the absorber
25: A single pole-double throw switch used how many wires excluding the ground wire?
- five
- two
- four
- three