Topics: All categories in the pool
1: On a day with low relative humidity, the two thermometers on a sling psychrometer will read
- far apart or greater difference
- 2F difference
- nearly the same
- a ling psychrometer doesn't have two theremometers.
2: On cooling towers, what causes the condenser water to drop
- sensible heat
- evaporation of the water droplets
- tower fans
- ambient temperatures
3: A motor is rated for 120 volts and has a RLA (rated-load amps) of 5 amps. What is the wattage of the motor?
- 746 watts
- 5KW
- 600 watts
- 1000 watts
4: The location of the thermal bulb for the TXV on the evaporator effects
- both the pressure and temperature in the feeler bulb
- the amount of superheat required to operate the TXV
- the amount of liquid in the evaporator
- the amount of gas in the evaporator
5: A secondary coolant is defined as
- any liquid used for the transmission of heat without a change of state in A/C refrigeration systems having flash point above 150F
- a low temperature refrigerant used for cascading systems
- any refrigerant direcly in contact with the cooling space for process cooling
- a combination of interconnected parts from a closed circuit in where fluid is circulated for the purpose of cooling for a refrigeration system.
6: At higher altitudes, boiling temperatures
- increase
- are unaffected
- depends on the refrigerant
- decrease
7: The high side float assembly meters refrigerant into the evaporator through the
- upper chamber of the high side
- lower chamber of the low side
- lower chamber of the high side
- upper chamber of the low side
8: Thermodynamics is the branch of science that deals with
- molecular therory
- energy due to motion
- heat energy
- state of energy
9: The pressure relief device of a positive displacement compressor shall discharge in the ______________or in accordance with 9.7.8
- the vapor side of the system
- high side of the system
- the liquid side of the system
- low side of the system
10: What is the minimum height refrigeration piping should be placed against walls?
- 72"
- 7.25'
- 6'
- Ceiling height
11: Capacitors are rated in
- kelvins
- megaohms
- micro-farads
- volt - amperes
12: Class T machine room
- shall include closets used for setting equipment
- has no flame producing apparatus permanently installed
- shall have remote controls to stop the action of the refrigerant compressor
- shall have refrigerant leak detecting systems installed inside and outside the room
13: Brazed joints melt at temperatures above
- 500F
- 1,200F
- 800F
- 1,000F
14: Crankcase heaters are energized
- while the compressor is running
- to prevent compressor freeze-up
- when the compressor is off
- to allow easy compressor start-up
15: A chilled water pump's suction gauge reads 10 psig. The discharge gauge reads 48 psig. What is the head in feet the pump is working against?
- 96
- 38
- 88
- 58
16: The critical temperature of a refrigerant gas occurs when
- any increase in pressure will not liquefy the gas
- any decrease in pressure will cause condensation
- the gas returns to a liquid
- the gas is no longer saturated
17: E = I X R is
- Watts Law
- Ohms Law
- Amps Law
- Impedance Law
18: Large vessels containing refrigerant ______________________ from using two or more pressure-relief devices in parallel to obtain the required capacity.
- of Group B2 refrigerant shall be prohibited
- containing R-11, R-123 & R-717 exclusively shall not be prohibited
- shall not be prohibited
- shall be prohibited
19: Evaporators within 18" of a heating coil must be equipped with a
- high limit control
- zone valve
- pressure relief device
- low limit control
20: A chilled water pump suction gauge reads 10 psig. Discharge gauge reads 48 psig. The head in feet of the pump is working against
- 88
- 38
- 108
- 116
21: Refrigerant restricted in 2004 but used for transition for decades:
- R-134A
- R-22
- R-11
- R-123
22: How far from the window does a relief valve need to be according to ASHRAE-15?
- At least 20'
- There is no minimum for relief valve and windows.
- At least 40'
- At least 30'
23: "P" represents ______ in the Watt's law formula
- voltage
- watts
- reactance
- amperage
24: What is the amp draw of a 40 VA transformer at 24 volts
- 1,000 amps
- 1K amps
- 106 amps
- 1.6 amps
25: "E" references ____ in the Ohm's law formula
- resistance
- amperage
- capacitance
- voltage