Topics: All categories in the pool
1: Ohm's Law indicates Amps X Resistance = ___________.
- Ohms
- Impedance
- Volts
- Current
2: In an air conditioning plant which an indirect low side, water is used inside of bring: the proper sequence of operating the plan is
- reset the safety valve
- reset the expansion valve
- start the fan and circulating pump
- start the comrpessor
3: A 120 volt motor rated at 1,800 watts. You find the motor is drawings 25 amps. The motor is
- drawing RLA and is running as it should
- drawing LRA and is seized and should be replaced.
- running hot
- none of the above
4: Watt's Law indicates Volts X Amps = _________.
- Ohms
- Watts
- Current
- Resistance
5: The boiling point of a refrigerant is based on
- Temperature
- Heat content
- a pressure-temperature relationship
- None of the above.
6: What section governs pressure vessels?
- Section 8 ASHREA 15 ASME unfired
- Section 1 ASHREA 15 ASME fired
- Section ASHREA 34
- OSHA
7: What is the refrigerant dichlorodifluoromethane?
- R-134A
- R-22
- R-12
- R-123
8: Suction valve unloaders afford an effective means of
- evaporator control
- superheat control
- capacity control
- refrigerant control
9: How much clearance do you need around the perimeter of electrical panels?
- 12"
- 36"
- 18"
- 24"
10: Name a CFC refrigerant(s):
- R-11
- R-12
- R-123
- both a & b
11: What is the purpose of a surge capacitor on a contactor?
- to protect low voltage equipment
- to keep the contactor pulled in
- to provide smoother start/stops
- to balance the sine waves
12: Which is the lowest vacuum?
- 5 psig
- 10 psia
- 1,000 Microns
- 5" hg
13: A positive displacement compressor is
- a compressor in which the increase in pressure is attained by changing the internal pressure of the compression chamber
- where the compressor's suction pressure and the compressor;s discharge pressure is more than 50 PSI
- is a reciprocating type compressor with 2 or more pistons
- a compressor in which the increase in pressure is attained by changing the internal volume of the compression chamber
14: Ashrae states that the equipment on a building needs to conform to adjacent buildings classifications when within ____ feet from opening and intakes.
- 15
- 50
- 20
- 75
15: Adjusting the spring pressure on a TXV
- makes no difference
- changes subcooling
- adjusts the bulb charge
- changes superheat
16: The gauge thickness required on a CO2 tank construction is
- 1/16"
- 1/8"
- 3/32"
- 5/16"
17: Heat transferred by conduction from one body to another is done via:
- gas
- liquid
- solid
- All of the above
18: 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
19: How many refrigerant classifications are there for toxicity?
- 5
- 3
- 2
- 1
20: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Magnesium
- Zinc
- Nickel
- Copper
21: The generator shell contains the
- condenser and the generator
- condenser and the absorber
- condenser, the evaporator, and the generator
- evaporator and the absorber
22: Trichlorofluoromethane is the name of what refrigerant?
- R-11
- R-113
- R-12
- R-502
23: A R-22 system running with a condensing temperature of 110F and a 40F evaporator temperature will read pressures of ____ on the high side and ____ on the low side.
- 455 psig, 185 psig
- 257 psig, 77 psig
- 226 psig, 68 psig
- 350 psig, 120 psig
24: The 522 CMR 9.00 has adopted for reference ASHRAE ____
- 25
- III
- 10
- 15
25: Transformers are rated in
- amps
- volt-amps
- volts
- volts-ohms