Topics: All categories in the pool
1: 1 Watt = ______ BTU's?
- 3.412
- 12
- 7.216
- 4.482
2: Class T machine room
- shall include closets used for setting equipment
- shall have remote controls to stop the action of the refrigerant compressor
- has no flame producing apparatus permanently installed
- shall have refrigerant leak detecting systems installed inside and outside the room
3: What pipe can not be used for refrigeration?
- K
- L
- N
- M
4: Pressure-limiting device isn't required on a factory-sealed system containing less than ____ lbs.
- 18
- 33
- 50
- 22
5: Pressure vessels with an internal volume of 3 cubic feet or more
- do not need pressure relief protection
- shall use fusible plugs
- shall use pressure relief devices or fusible plugs
- shall use pressure relief devices
6: A crankcase heater has a supplied voltage of 100 volts and is drawing 1.4 amps. What is the resistance?
- 71 ohms
- 80 ohms
- 27 ohms
- 104 ohms
7: Ammonia (NH3) is a group III refrigerant
- True
- False
8: The main purpose of a refrigerant detector in a machinery room is to
- inform there is a refrigerant leak int he system
- detect toxins in the air caused by a refrigerant leak
- to set off an alarm when there is refrigerant present inside the room
- all of the above
9: Low ambient controls are used when
- economizers are used
- when systems run all year round
- always
- on air conditioning systems only
10: When an inspection is needed, how often must it be done?
- every 36 months
- every 24 months
- annually
- every 18 months
11: A tachometer is an instrument used to measure
- air velocity
- static pressure
- speed
- RPM
12: What happens to copper joints when overheated?
- nothing
- joint becomes oxidized and ditorted
- copper becomes harder
- none of the above
13: In a motor, an internal overload might open if
- there's a direct short
- there's an excess current draw through the motor
- there was a high pressure refrigerant was used for a low pressure system.
- there's an open start winding
14: A plug containing an alloy that will melt at a specific temperature to relief pressure is a
- relief plug
- fusion plug
- rupture plug
- fusible plug
15: Watt's Law indicates Volts X Amps = _________.
- Ohms
- Current
- Watts
- Resistance
16: An evaporator coil located near heating coil shall have a pressure-relief device installed within ______ inches of the evaporator.
- 48
- 18
- 36
- 24
17: Whoever owns/uses a refrigeration or air conditioning system covered by this code
- must notify the Department of Public Safety prior to starting the system
- shall be licensed by the Commonwealth of Massachusetts according to CMR 522
- shall make application for inspections to the Chief of Inspectors
- None of the above
18: Laten heat is associated with a change in state of a refrigerant but not temperature
- True
- False
19: Total heat of a substance is considered
- specific heat
- sensible heat
- empathetical
- enthalpy
20: If your suction line is warmer than the room temperature, this may indicate
- below normal superheat
- a low charge
- an over charge
- plugged air filter
21: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- lower
- there is no Group B1 refrigerants
- the same
- higher
22: What must be done to refrigerant pipes before being buried?
- Leaked checked
- Certified
- Coated
- Encased
23: Increasing superheat will do what to your frost line?
- Could either increase or decrease depending on the load conditions
- Increasae
- Decrease
- Nothing
24: E = I X R is
- Amps Law
- Impedance Law
- Ohms Law
- Watts Law
25: Heat is a form of
- power
- matter
- energy
- work