Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Miscibility is the ability of the fluid to? Readily mix with other fluid Reacts with air and forms corrosion compounds Reacts with water and forms acidic compounds Reacts with water and air and burns | show 🗑
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| Most of the heat transfer from the heat exchanger is by which of the following? | show 🗑
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| show | Latent heat
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| _____ temperature is the temperature is the temperature below which moisture condense out of air? ______ Wet bulb Dry bulb Dew bulb | show 🗑
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| show | true
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| show |
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| show | Convection
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| 1 horsepower = _________ watts: 3.41 3140 746 7460 | show 🗑
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| True or false Mineral oils are not to be used with HFC alternate refrigerants: | show 🗑
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| In Psychrometric ________ indicates which of the following: Dew point temperature line? Lines that run diagonally from left to right across the chart Chart curved boundary X axis Y axis | show 🗑
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| The downstream velocity of the sound wave between the points is greater than that of the same wave in a fluid at rest. This is due to: Hall effect Newton effect Doppler effect Acoustic effect | show 🗑
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| show | Radiation
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| show | Equal to
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| show | Non linear
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| Which of the following type of controllers are used in HVAC applications? PI I ID P | show 🗑
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| show | 24v
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| show | Faster
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| show | Yellow hose
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| _______ use two special helical rotors that introduce suction vapors then compress them: Scroll Compressors, Reciprocating Compressors, All the options are correct or Screw Compressors | show 🗑
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| 1 Watt = _____ Btu? 3140, 0.341, 341 or 3.41 | show 🗑
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| show | Heavier
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| Which of the following shall not be used near flammable material: Ultrasonic leak detector, Electronic leak detector, Halide leak detector or Sulfur leak detector | show 🗑
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| _______ is the temperature at which oil starts to produce a waxy substance that may interfere with the refrigeration system: Pour point Floc point Boiling point Dash point | show 🗑
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| An oil separator is located in the _____: Liquid line Expansion line Suction line Discharge line | show 🗑
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| Higher the ambient temperatures, ____ will be the evacuation time of the refrigerants from the system: Higher Lesser | show 🗑
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| Furnaces are placed into categories based upon: Total airflow in CFM Venting characteristics Btuh capacity range Gas valve type | show 🗑
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| show | 15psig
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| ______ is the heat that is absorbed or extracted when a substance changes its state: Entropy Specific heat Latent heat Enthalpy | show 🗑
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| Sight glass is present at _____ in the refrigeration cycle Liquid line Suction line Expansion line Evaporation line | show 🗑
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| What will be the resistance in the circuit if the supply voltage is 30V and current flowing through the circuit is 5A: 6 ohms 1/6 ohms 3 ohms 1/3 ohms | show 🗑
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| Current in a closed circuit is limited by which of the following: Resistance Heat Temperature Voltage | show 🗑
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| show | 3140
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| Dual voltage three phase motor has _____ number of terminals 9, 6, 12 Or 3 | show 🗑
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| show | Nitrogen
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| show | Purge unit
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| show | Copper
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| Turning the TXV valve stem in _______ direction increases super heat: Counter clockwise Clockwise | show 🗑
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| Which of the following compressor uses pistons, cylinders and valves to compress the refrigerant gas: Screw compressor Both Reciprocating and screw compressors None of the options are correct Reciprocating compressor | show 🗑
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| Which of the following law states that the total pressure of a confined mixture of gases is the sum of pressures of each of the gases in the mixture: Dalton's law Boyle's law Charles's law Fleming's law | show 🗑
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| show | False
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| show | sublimation
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| show | Inlet line
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| At 32°F, 1 lb of ice can be changed to 1 lb of water by adding ____ Btu 144 Btu 36 Btu 108 Btu 72 Btu | show 🗑
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| Which of the following circuit does not have multiple paths for current flow: parallel ac series dc | show 🗑
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| Relays and contactors are ____ control switches: pressure-activated temperature-activated electrically operated manually operated | show 🗑
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| In Fire tube boiler, which of the following pass through the tubes: either flue gases or hot water hot water flue gases | show 🗑
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| show | True
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| show | All the options are correct
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| show | Dew point temperature line
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| show | 50 to 5000 psig
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| The heat energy change that is associated with a change in the phase (state) is: Sensible heat Latent heat Absolute heat Super heat | show 🗑
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| _____ is a combination of both sensible heat and latent heat: Enthalpy Entropy Resultant heat Absolute heat | show 🗑
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| What will be typical range of the current sensor: 4-20 mA 0 - 5 mA 5 - 20 mA 0 - 10 mA | show 🗑
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| Approximately _____ voltage is required for creating a spark on a spark ignition system: 150V 1500V 15000V 150000V | show 🗑
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| _____ is the air that is mixed with the fuel before the fuel reaches the burner: Primary air Secondary air Tertiary air None of the answers are correct | show 🗑
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| show | Compressor
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| Which one of the following is used in systems for pressurizing the building: Exhaust or relief dampers Exhaust None of the above Relief dampers | show 🗑
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| True or false Heat transferred by radiation travels through space without heating the space | show 🗑
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| show | Manometer
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| Disposable air filters should be changed atleast _______ times in a year: Twice Thrice Four times Once | show 🗑
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| show | solid fuels
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| The reclaimed refrigerant must meet the standards of _________ before it can be resold: ARI 500 ARI 740 ARI 1000 ARI 700 | show 🗑
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| For every 1000 feet above sea level,the capacity of a natural gas furnace is de-rated by _______ 1% 0.5% 4% 2% | show 🗑
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| show | False
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| show | Yellow
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| show | Compressor
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| The power developed by the centrifugal pump is proportional to _________ its speed: Square Proportional to Cube Quadruple | show 🗑
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| According to ASME, safety valve of the boiler should be tested for every _____ days: 7 30 45 15 | show 🗑
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| Flue gas temperatures at which the high-efficiency furnaces operate typically is: 100 and 275 degrees 250 and 450 degrees 450 and 675 degrees 180 and 360 degrees | show 🗑
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| show | Horizontal lines
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| Low pressure steam boilers will have operating pressure less than: 5 psi 15 psi 25 psi 50 psi | show 🗑
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| show | 5 to 7 times
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| show | False
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| show | Specific volume
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| show | outdoor fan
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| show | Solenoid valve
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| Which of the following element is used to increase the power factor of a circuit: All the options are correct Resistor Capacitor Inductor | show 🗑
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| Which of the following motors are more rugged and can handle more load: Sleeve bearing type motors Or Ball bearing type motors | show 🗑
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| True or false Square cut or butt joints are not permitted on corners of ductboard sections: | show 🗑
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| show | DC shunt motors
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| A suction line accumulator is used for which of the following purpose: All the options are correct Store liquid refrigerant during the off cycle Prevent liquid refrigerant from entering compressor Store liquid refrigerant during the off cycle | show 🗑
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| Which of the following is not available in heat pump: compressor crankcase heater suction line accumulator reversing valve low pressure sensing switch | show 🗑
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| show | 1800
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| show | superheat
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| An amperage is the measurement of which of the following: Voltage Current Electric charge Power | show 🗑
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| The efficiency of a boiler increases as the heating surface of the boiler ______ : increases decreases | show 🗑
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| show | Ball bearing type motors
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| show | Both the options are correct
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| show | Short circuit
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| show | Faster
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| show | 78%
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| True of false The wetback fire tube boiler has more heating surface compared to dryback fire tube boiler: | show 🗑
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| show | Compressor
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| show | Decreases
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| Suction pressure at the ________ is governed by the design of the evaporator: Condenser Compressor | show 🗑
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| show | 65%
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| ______ of a fan is the total pressure diminished by the fan velocity pressure: Velocity pressure Static pressure Dynamic pressure Total pressure | show 🗑
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| True of false A filter drier is located in the Liquid line at the outlet of the condenser: | show 🗑
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| show | Reciprocal Compressors
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| When a system is circulating an excessive amount of oil, the oil indicator may become saturated. This results in the indicator to appear in _______ color Red Brown Orange Yellow | show 🗑
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| Which of the following gas shall not be used to pressurize a refrigeration system: Both the options are correct Oxygen Acetylene | show 🗑
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| ________ compressors operate most efficiently with a high molecular weight, high specific volume refrigerant: Scroll Centrifugal Reciprocating | show 🗑
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| The horsepower required for any fan or blower varies directly as the ______ of the speed: Square directly proportional Cube 4 times | show 🗑
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| To minimize the possibility of freeze-up or corrosion, the maximum safe limits of moisture in Refrigerant R-22 is: 15 ppm 60 ppm 30 ppm 45 ppm | show 🗑
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| _______ Heat that can be measured or felt Internal heat External heat Sensible heat Latent heat | show 🗑
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| True or false Discharge Bypass Valves (DBV) responds to the change in downstream or suction pressure: | show 🗑
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| show | Lower
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| True or false Purging refers to the release of air or noncondensable gases from the system: | show 🗑
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| show | True
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| True or false In boiler safety valves can be used to vent: | show 🗑
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| A _______ uses a piston moving inside a cylinder to compress the refrigerant: Scroll Compressor Reciprocation Compressor Screw Compressor Centrifugal Compressor | show 🗑
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| show | Lagging
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| Smoke chamber should be constructed so that slopes at ______ angle from the smoke shaft to the flue opening: 75 degrees 30 degrees 45 degrees 60 degrees | show 🗑
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| One MBH is equivalent to ______ BTU’s per hour 12,400 1,000 746 5,400 | show 🗑
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Created by:
Tg89