Topics: All categories in the pool
1: To determine the pump size needed for an open cooling tower system, the following must be known,
- GPM and balanced head and friction head
- GPM and unbalanced head and friction head
- GPM and friction head
- GPM, pipe size, and equivalent head.
2: What will occur if the strong solution in an absorption chiller becomes too strong?
- The machine will stop cooling and the solution will evaporate.
- The machine will cool excessively as the solution evaporates
- The machine will stop cooling and solution will crystallize
- The machine will cool excessively as the solution crystallizes.
3: A high side float is a
- metering device used on critically charged systems that controls the level of the liquid refrigerant in the high pressure side of the system.
- float type valve that controls the amount of refrigerant stored in the receiver
- float type valve that controls the crankcase oil level
- float type switch that stops the compressor when the pressure on the high side becomes too high
4: Atmospheric pressure is equal to
- 29.92" Hg
- 14.7 psia
- 14.7 psig
- both a & b
5: An example of direct system is
- rooftop unit
- chiller
- absorber
- none of the above
6: RPM's of a centrifugal compressor are at approximately?
- 15,000
- 30,000
- 500
- 10,000
7: How many groups of refrigerants are there?
- 7
- 5
- 3
- 1
8: _____ alloys shall not be used in contact with an halogenated refrigerants.
- Copper
- Nickel
- Zinc
- Magnesium
9: When this is installed on the high side of a system, it must be capable of reading 1.2 times the design pressure (ASHRAE 15 9.11.3)
- Pressure gauge
- Temperature gauge
- Sight glass gauge
- All of the above
10: A total of all group A-2,B-2, A-3, and B-3 refrigerants shall not exceed ____ lb in the occupied areas and machinery rooms of institutional occupancies.
- 100
- 50
- 350
- 550
11: Fusible plugs shall not be used with pressure vessels of
- 3 cubic feet or less
- 15 cubic feet or more
- 3 cubic feet or more
- 15 square feet or less
12: Where are the three places that the discharge from an ammonia relief valve be piped?
- atmosphere, tank containing water, where the A.H.J. indicates
- underground, into drain, into mechanical room
- to chemical neutralizing tank only
- none of the above
13: Increasing superheat will do what to your frost line?
- Increasae
- Nothing
- Could either increase or decrease depending on the load conditions
- Decrease
14: What is specific heat?
- measured heat
- heat required to raise the temperature of 1lb of a substance 1 degree
- the specific heat required to change the state of one cubic foot of air to steam
- none of the above
15: Which winding have the most turns?
- run
- depends on the motor phase
- they have equal amount of turns
- Start
16: Low ambient controls are used when
- economizers are used
- always
- on air conditioning systems only
- when systems run all year round
17: Group A3 refrigerants have a ______ flammability rating than Group B1 refrigerants
- the same
- there is no Group B1 refrigerants
- lower
- higher
18: 1 HP = ____ Watts?
- 3,412
- 3.1416
- 11,239
- 746
19: What chemical in the refrigerant set off the leak detection alarm?
- Fluorine
- Chlorine
- Both A and B
- none of the above
20: B3 refrigerants are considered
- toxic and highly flammable
- non-toxic but flammable
- non-toxic but non-flammable
- toxic but non-flammable
21: "P" represents ______ in the Watt's law formula
- voltage
- reactance
- amperage
- watts
22: On a pumpdown system, the liquid-line solenoid is controlled by the
- defrost timer
- low pressure switch
- low-ambient controller
- thermostat
23: The total amount of refrigerant stored in a machinery room in all containers not provided with relief valves shall not exceed
- 330 lbs
- 55 lbs
- 500 lbs
- 660 lbs
24: 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
25: What is a megaohm meter?
- An electric meter used by electricians to test large 3-phase blower motors for the correct rotation
- An electric meter that measures very high resistance values by sending a 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
- Is an electric meter that measures extremely low resistance valves by sending high DC voltage signal into the object being tested.