Refrigeration & HVAC MCQ Marathon

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HVAC tech MCQs for practice

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1 MeanIt

Philippines

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Refrigeration & HVAC MCQ Marathon


Refrigeration & HVAC MCQ MarathonVersion en ligne HVAC tech MCQs for practice par 1 MeanIt 1 What is the form of energy that flows from a higher-temperature body to a lower-temperature body? a Pressure b Work c Heat d Power 2 Which part of a refrigeration system compresses the refrigerant? a Compressor b Evaporator c Condenser d Expansion valve 3 Which refrigerant is considered least harmful to the environment among the choices? a R-22 b R-404A c R-134a d R-600a 4 What is the approximate value of atmospheric pressure under the conventional metric system? a 103.3 kgf/cm² b 0.103 kgf/cm² c 1.033 kgf/cm² d 10.33 kgf/cm² 5 What should be done with the refrigerant before performing a repair on a refrigeration system? a Release it into the atmosphere b Mix it with nitrogen and release it c Burn the refrigerant off d Recover the refrigerant properly 6 If the compressor is sweating badly, what could be the possible trouble? a Refrigerant overcharge b Clogged condenser c Refrigerant undercharge d Low room temperature 7 Which statement best describes how refrigerant moves through a refrigeration system? a Moves only through evaporator and compressor b Vapor flows from condenser to evaporator without compression c Refrigerant vapor is pulled from the evaporator, compressed in the compressor, and pushed toward the condenser d Liquid from condenser directly into compressor 8 Specialized clothing or equipment used for worker safety is called: a Personal Protective Equipment (PPE) b Safety Data Manual c Standard Operating Procedure d Maintenance Equipment 9 A technician lifts a 50-kg motor compressor using his back instead of his legs. What type of hazard is involved? a Ergonomic hazard b Chemical hazard c Electrical hazard d Biological hazard 10 Which statement is correct regarding the proper handling of refrigerant cylinders? a All of the above b Ignore heat exposure c Release cylinders periodically d Store in direct sun 11 Which among the following are biological hazards? a Dust, noise, and vibration b Electricity, heat, and radiation c Bacteria, viruses, molds, and fungi d Refrigerants, oils, and solvents 12 What does MSDS stand for? a Mechanical Safety Documentation System b Material Safety Data Sheet c Material Service and Diagnostic Standard d Maintenance Safety Data System 13 What is the condition of refrigerant from Point 3–4 in the basic refrigeration cycle? a High-pressure vapor b Low-pressure vapor c Low-pressure liquid d High-pressure liquid 14 What type of gas should be passed through the pipe while brazing refrigeration tubing? a Nitrogen (N2) b Carbon dioxide c Oxygen d Hydrogen 15 What is the purpose of using nitrogen while brazing refrigeration tubing? a Increase the brazing temperature b Prevent oxidation inside the tube c Cool the tubing rapidly d Increase refrigerant pressure 16 A clogged filter drier can cause compressor short cycling due to the activation of the: a Low-pressure switch b Overload relay c Temperature switch d High-pressure switch 17 The green wire from the motor should be connected to the: a Earth ground b Line terminal c Compressor terminal d Neutral terminal 18 When troubleshooting an electronic circuit board, what should the technician check first? a Printed circuit board b Relay c Power source d Capacitor 19 Which statement about motor protection devices is true? a The more expensive the motor, the more elaborate the protection devices should be b Small motors do not require protection devices c Protection devices are unnecessary if the motor is new d All motors require exactly the same protection devices 20 What does high superheat generally indicate? a Starved evaporator b Excessive liquid refrigerant in the compressor c Overcharged system d Flooded condenser 21 Which type of compressor uses pistons to compress refrigerant gas? a Centrifugal b Reciprocating c Scroll d Rotary 22 Where is the bulb of a thermostatic expansion valve (TXV) normally mounted? a Evaporator outlet b Liquid line c Condenser inlet d Compressor discharge line 23 Jorix and Kriz are discussing the proper procedure before repairing a refrigeration system. Jorix suggests releasing the refrigerant directly into the atmosphere, while Kriz recommends recovering the refrigerant using a recovery machine. Who is correct? a Jorix, because refrigerant can be safely released into the atmosphere. b Both Jorix and Kriz, because either method is acceptable. c Kriz, because refrigerant should be properly recovered before repair. d Neither, because the refrigerant should be burned off before repair. 24 Which component moves refrigerant vapor toward the condenser after compression? a TXV b Condenser c Evaporator d Expansion valve 25 What is the primary function of the evaporator in a refrigeration cycle? a Absorb heat from the cooled space b Compress refrigerant c Condense refrigerant d Release high-pressure gas 26 Which statement best describes how refrigerant moves through a refrigeration system? a Only liquids circulate b Vapor bypasses compressor c Vapor is compressed, liquefied, then expanded d Liquid moves directly to evaporator 27 What is the main purpose of the expansion device in a refrigeration cycle? a Store refrigerant b Heat the refrigerant c Increase pressure d Reduce refrigerant pressure and temperature 28 Which of the following is an example of a safety precaution in refrigeration work? a Release refrigerant as needed b Ignore heat sources c Follow proper PPE and procedures d Disregard MSDS 29 Which of the following best describes the direction of heat flow in a condenser? a From high pressure to low pressure b From air to refrigerant c From refrigerant to surrounding air d From liquid to vapor 30 Which unit is used to measure atmospheric pressure in the document’s context? a kPa b psi c kgf/cm² d atm 31 What is the correct action for a technician to take with a refrigerant before repairs? a Mix with nitrogen and release b Recover the refrigerant properly c Release to atmosphere d Burn it 32 Which statement correctly describes a basic refrigeration cycle step? a Expansion valve increases temperature b Condenser heats the refrigerant c Compressor cools the refrigerant d Evaporator absorbs heat, refrigerant vaporizes 33 Which item is NOT a common refrigerant safety acronym in the document? a OSHA b PPE c MSDS d TXV 34 What does this symbol represent in refrigeration and air-conditioning systems? a Compressor b Resistor c Fan Motor d Capacitor 35 What does this symbol represent in refrigeration and air-conditioning systems? a Compressor b Fan Motor c Magnetic contactor d Circuit breaker 36 What does this symbol represent in refrigeration and air-conditioning systems? a Resistor b Diode c Capacitor d Thermostat 37 Which of the following symbols represents a FLAMMABLE hazard? a b c d 38 Which of the following symbols represents a SERIOUS HEALTH hazard? a b c d 39 Which of the following symbols represents a TOXIC hazard? a b c d 40 What hazard does this symbol represent? a Toxic b Harmful c Hazardous to environment d Corrosive 41 What hazard does this symbol represent? Choose one or more answers a Toxic/Poisonous b Harmful/ Irritant c Hazardous to environment d Corrosive 42 What hazard does this symbol represent? a Gas under pressure b Oxidizing c Irritant d Explosion 43 What hazard does this symbol represent? a Irritant b Oxidizing c Toxic d Explosive 44 What electrical symbol does this picture represent? a Transformer b Resistor c Capacitor d Circuit breaker 45 What electrical symbol does this picture represent? a Transformer b Relay c Thermistor d Circuit breaker Feedback 1 Heat naturally moves from hot to cold bodies in thermodynamics. 2 The compressor raises the refrigerant’s pressure and temperature. 3 R-600a is a hydrocarbon with lower environmental impact compared to common HFCs. 4 Atmospheric pressure is about 1.033 kgf/cm² at sea level. 5 Refrigerants must be recovered to prevent environmental harm. 6 Excess refrigerant can cause high pressure and sweating. 7 Cycle: evaporator (absorb heat) → compressor (compress) → condenser (release heat). 8 Safety gear is collectively PPE. 9 Improper lifting risks musculoskeletal injury. 10 Proper handling includes avoiding heat, proper storage, and safety precautions. 11 Biological hazards include microbes. 12 MSDS is the safety data sheet for chemicals. 13 In basic cycle, after condenser, refrigerant is high-pressure liquid. 14 Nitrogen prevents oxidation during brazing. 15 Inert nitrogen protects joints from oxidation. 16 Low-pressure switch can trip if drying impairs flow. 17 Green is typically the safety earth ground. 18 Power is the first check in troubleshooting. 19 Protection scales with motor size and risk. 20 High superheat often means insufficient evaporator heat transfer. 21 Reciprocating compressors use pistons. 22 TXV sensing bulb is typically on the evaporator outlet side. 24 The condenser rejects heat and condenses vapor to liquid. 25 Evaporator absorbs heat, causing refrigerant to vaporize. 26 Cycle: evaporator → compressor → condenser → expansion. 27 Expansion device drops pressure to enable evaporation. 28 Safety procedures protect technicians and environments. 29 Condenser rejects heat to the environment. 30 The document uses kgf/cm² for pressure values. 31 Proper recovery prevents environmental harm. 32 During evaporation, refrigerant absorbs heat and vaporizes.

Refrigeration & HVAC MCQ Marathon

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Refrigeration & HVAC MCQ MarathonVersion en ligne

par 1 MeanIt

What is the form of energy that flows from a higher-temperature body to a lower-temperature body?

Which part of a refrigeration system compresses the refrigerant?

Which refrigerant is considered least harmful to the environment among the choices?

What is the approximate value of atmospheric pressure under the conventional metric system?

What should be done with the refrigerant before performing a repair on a refrigeration system?

If the compressor is sweating badly, what could be the possible trouble?

Which statement best describes how refrigerant moves through a refrigeration system?

Specialized clothing or equipment used for worker safety is called:

A technician lifts a 50-kg motor compressor using his back instead of his legs. What type of hazard is involved?

Which statement is correct regarding the proper handling of refrigerant cylinders?

Which among the following are biological hazards?

What does MSDS stand for?

What is the condition of refrigerant from Point 3–4 in the basic refrigeration cycle?

What type of gas should be passed through the pipe while brazing refrigeration tubing?

What is the purpose of using nitrogen while brazing refrigeration tubing?

A clogged filter drier can cause compressor short cycling due to the activation of the:

The green wire from the motor should be connected to the:

When troubleshooting an electronic circuit board, what should the technician check first?

Which statement about motor protection devices is true?

What does high superheat generally indicate?

Which type of compressor uses pistons to compress refrigerant gas?

Where is the bulb of a thermostatic expansion valve (TXV) normally mounted?

Jorix and Kriz are discussing the proper procedure before repairing a refrigeration system. Jorix suggests releasing the refrigerant directly into the atmosphere, while Kriz recommends recovering the refrigerant using a recovery machine. Who is correct?

Which component moves refrigerant vapor toward the condenser after compression?

What is the primary function of the evaporator in a refrigeration cycle?

Which statement best describes how refrigerant moves through a refrigeration system?

What is the main purpose of the expansion device in a refrigeration cycle?

Which of the following is an example of a safety precaution in refrigeration work?

Which of the following best describes the direction of heat flow in a condenser?

Which unit is used to measure atmospheric pressure in the document’s context?

What is the correct action for a technician to take with a refrigerant before repairs?

Which statement correctly describes a basic refrigeration cycle step?

Which item is NOT a common refrigerant safety acronym in the document?

What does this symbol represent in refrigeration and air-conditioning systems?

What does this symbol represent in refrigeration and air-conditioning systems?

What does this symbol represent in refrigeration and air-conditioning systems?

Which of the following symbols represents a FLAMMABLE hazard?

Which of the following symbols represents a SERIOUS HEALTH hazard?

Which of the following symbols represents a TOXIC hazard?

What hazard does this symbol represent?

What hazard does this symbol represent?

What hazard does this symbol represent?

What hazard does this symbol represent?

What electrical symbol does this picture represent?

What electrical symbol does this picture represent?