Topics: All categories in the pool
1: It takes how many BTU/hr to melt one pound of ice at 32F
- 970
- 212
- 144
- 180
2: The amount of heat required to raise the temperature of 1 lb of water 1F is?
- 1 Therm
- 1 Kelvin
- The rate of conduction
- 1 BTU
3: All low-pressure chillers use which type of compressor?
- Rotary
- Reciprocating
- Centrifugal
- Scroll
4: A motor starter is a device that includes an overload and a _______?
- contactor
- 2-pole contacts
- duel-coil
- all of the above
5: If your suction line is warmer than the room temperature, this may indicate
- a low charge
- an over charge
- plugged air filter
- below normal superheat
6: What effect does the temperature of air have on humidity?
- warmer air holds more moisture then cooler air
- cooler air holds more moisture then warmer air
- air has no effect of humidity
- none of the above
7: Low pressure systems have what kind of compressor?
- Scroll
- Centrifugal
- Rotary
- Reciprocating
8: The formula for Pure Power in a resistance circuit is
- Kw = volts X amps
- Watts = volts X amps
- Watts X power factor
- Watts X amps.
9: If two 500 ohm resistors are connected in series, the resistance will be
- 500 ohms
- 1000 ohms
- 20 ohms
- 200 ohms
10: Two capacitors are wired in parallel. One capacitor has a value of 15uf. The other has a value of 25uf. What is the total value supplied?
- 25 uf
- 20 uf
- 15 uf
- 40 uf
11: Heat cannot of itself, pass from a
- cold to a warmer body
- warm to a colder body
- state of hot energy to a state of cold energy
- None of the above
12: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- the gas returns to a liquid
- any decrease in pressure will cause condensation
- the gas is no longer saturated
13: Electricity involves the movement of electrons in atoms
- True
- False
14: Where are the three places that the discharge from an ammonia relief valve be piped?
- To chemical neutralizing tank only
- Underground, into drain, into mechanical room
- Atmosphere, Tank containing water, where the AHJ indicates.
- None of the above.
15: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 15
- 25
- III
- 10
16: All serviceable components of a refrigeration system shall be provided with
- service manuals
- safe access
- name plates with markings referring to pressure and temperature in accordance with ASME Boiler and Pressure Vessel Code
- manufactures instructions on start-up procedures
17: What is not a requirement of a Class T machine room?
- Tight fitting doors
- Self-closing doors
- Fire hose connected to the building fire protection system.
- Automatic ventilation
18: The best way to detect ammonia in brine is
- nessler regaent
- carbonation of soda
- CO2 gas
- potassium of line
19: A R-410A system running with a condensing temperature of 110F and 50F evaporator temperature will read pressures of ___ on the high side and ___ on the low side
- 226 psig, 68 psig
- 455 psig, 185 psig.
- 257 psig, 77 psig
- 365 psig, 120 psig
20: Low ambient controls are used when
- when systems run all year round
- economizers are used
- on air conditioning systems only
- always
21: What type of relief valve is used on a CO2 system?
- glove disc
- rupture disc
- gate valve
- fusible plug
22: The purpose of a receiver is
- a vessel to store refrigerant outside the system
- to increase the capacity that the system can hold
- to use a a later date
- all of the above
23: The principle used in continuous type absorption systems is
- Boyle's Law
- Ohm's Law
- Charles's Law
- Dalton's Law
24: What type of fuses must be used on a HVAC system?
- TR Type, Duel Element, Time Delay
- Fast blow
- 10% lower than RLA
- none of the above
25: What must be done to all doors and access points in duct work going through a mechanical room?
- Must be hindged
- Must be screwed shut
- Must be sealed and gasketed
- All of the above