HVAC/R Certification Test! Trivia Quiz
STIMULATE THE BRAINS OF NEW CONVERTS
Questions and Answers
- 1.
NAME 3 OF THE 6 COMMON TYPES OF COMPRESSORS USED IN HVAC/R
- A.
SCROLL, ROTARY, RECIPROCATING
- B.
SCREW, SCROLL, HERMITE
- C.
OPEN, CENTRIFUGAL, RECIPROCITY
- D.
ROTARY, RECIPROCATING, HERMITAGE
Correct Answer
A. SCROLL, ROTARY, RECIPROCATINGExplanation
The correct answer is SCROLL, ROTARY, RECIPROCATING. These are three common types of compressors used in HVAC/R systems. A scroll compressor uses two spiral-shaped scrolls to compress the refrigerant. A rotary compressor uses a rotating vane or screw to compress the refrigerant. A reciprocating compressor uses a piston and cylinder arrangement to compress the refrigerant. These types of compressors are commonly used in HVAC/R systems to compress and circulate refrigerant, allowing for the cooling or heating of a space.Rate this question:
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- 2.
THE COMPRESSOR, OF ANY TYPE PERFORMS TWO BASIC FUNCTIONS, TRUE OR FALSE?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The given correct answer is true. A compressor, regardless of its type, performs two basic functions. These functions include increasing the pressure of a gas or vapor and reducing the volume of the gas or vapor. These actions are essential in various applications such as refrigeration, air conditioning, and industrial processes. Therefore, it can be concluded that a compressor indeed performs these two fundamental functions.Rate this question:
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- 3.
THE INCREASE IN LOW SIDE PRESSURE WOULD INCREASE THE DENSITY OF THE REFRIGERANT VAPOR AND THUS INCREASING THE CAPACITY OF THE?
- A.
THERMO EXPANSION VALVE
- B.
CONDENSER COIL
- C.
COMPRESSOR
- D.
CONDENSER FAN MOTOR
- E.
LOW SIDE PRESSURE SWITCH
Correct Answer
C. COMPRESSORExplanation
When the low side pressure of the refrigerant increases, it means that more refrigerant vapor is being compressed by the compressor. This increase in density of the refrigerant vapor allows for more refrigerant to be compressed and circulated in the system, which ultimately increases the capacity of the compressor to cool the space. Therefore, the correct answer is the COMPRESSOR.Rate this question:
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- 4.
A HIGHER OUTDOOR TEMPURATURE OR A DIRTY CONDENSING COIL WOULD RAISE THE
Correct Answer
HIGH SIDE PRESSURE
HEAD PRESSURE
DISCHARGE PRESSUREExplanation
A higher outdoor temperature or a dirty condensing coil would cause an increase in the pressure on the high side of the system, specifically at the condenser. This increase in pressure is referred to as the high side pressure, head pressure, or discharge pressure.Rate this question:
- 5.
ON A MULTIMETER, WHAT READING REFLECT HOW MUCH WORK THE COMPRESSOR IS DOING?
- A.
HOW MANY TIMES THE COMPRESSOR CONTACTOR PULLS IN AND OUT
- B.
THE COMPRESSOR AMP DRAW
- C.
COMPRESSOR VOLTAGE DROP ACROSS THE WINDING'S
- D.
COMPRESSOR RESISTANCE TO GROUND
Correct Answer
B. THE COMPRESSOR AMP DRAWExplanation
The reading that reflects how much work the compressor is doing is the compressor amp draw. This measurement indicates the amount of electrical current that the compressor is drawing from the power supply. A higher amp draw typically indicates that the compressor is working harder and consuming more energy. Therefore, monitoring the amp draw can provide insight into the workload and efficiency of the compressor.Rate this question:
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- 6.
THE HIGH SIDE PRESSURE WILL REFLECT WHAT IS HAPPENING ON THE LOW SIDE, TRUE OR FALSE?
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The statement is true because the high side pressure in a refrigeration system is directly influenced by what is happening on the low side. The low side is responsible for absorbing heat from the desired area, while the high side is responsible for releasing that heat. Therefore, any changes or issues on the low side, such as a blockage or low refrigerant levels, will directly affect the high side pressure.Rate this question:
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- 7.
WHAT COMPONENT ON THE HVAC SYSTEM MEASURES AND ADJUSTS THE SUPERHEAT?
- A.
FIX ORIFICE METERING DEVICE
- B.
THERMAL EXPANSION VALVE
- C.
THE EXTERNAL EQUALIZER LINE
- D.
THE EVAPORATOR
- E.
THE SUCTION LINE ACCUMULATOR
Correct Answer
B. THERMAL EXPANSION VALVEExplanation
The thermal expansion valve is the component on the HVAC system that measures and adjusts the superheat. It is responsible for regulating the flow of refrigerant into the evaporator coil based on the temperature and pressure conditions. By controlling the amount of refrigerant entering the evaporator, the thermal expansion valve ensures that the superheat, which is the temperature difference between the refrigerant vapor and its saturation temperature, is maintained at the desired level. This helps optimize the cooling efficiency of the system and prevent any potential damage or inefficiency.Rate this question:
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- 8.
AT WHAT AERA OF A RESIDENTAL HVAC SYSTEM DO YOU CALCULATE A PROPER TEMPERATURE SPLIT?
- A.
SUPPLY AIR FURTHEST FROM THE AIR HANDLER, AND THE RETURN AIR GRILL
- B.
RETURN AIR GRILL, AND SUPPLY AIR CLOSEST TO THE AIR HANDLER
- C.
EVAPORATOR COIL AND METERING DEVICE
- D.
CONDENSER COIL, AND COMPRESSOR
Correct Answer
B. RETURN AIR GRILL, AND SUPPLY AIR CLOSEST TO THE AIR HANDLERExplanation
The proper temperature split in a residential HVAC system is calculated between the return air grill and the supply air closest to the air handler. This is because the return air grill measures the temperature of the air being pulled into the system, while the supply air closest to the air handler measures the temperature of the air being pushed out into the living space. By comparing these two temperatures, HVAC technicians can determine if the system is operating efficiently and effectively.Rate this question:
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- 9.
WHAT IS A NORMAL TEMPURATURE SPLIT FOR A RESIDENTAL HVAC SYSTEM?
- A.
BETWEEN 15-20
- B.
BETWEEN 21-30
- C.
BETWEEN 15-17
- D.
BETWEEN 13-25
- E.
BETWEEN 1-100
Correct Answer
A. BETWEEN 15-20Explanation
A normal temperature split for a residential HVAC system refers to the difference in temperature between the supply air and the return air. This measurement is important as it indicates the efficiency of the system and whether it is properly cooling or heating the space. A temperature split between 15-20 degrees is considered normal for a residential HVAC system, indicating that the system is functioning correctly and effectively cooling or heating the air.Rate this question:
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- 10.
CUSTOMER CALLS, SAID THEY HAVE NO COLD AIR COMING OUT OF VENTS, YOU ARRIVE TO THE HOUSE AND NOTICE THE INDOOR FAN ISNT BLOWING CUSTOMER SAID THE FAN HAS NOT BEEN WORKING FOR A WHOLE DAY, WHAT IS THE FIRST THING YOU CHECK WHEN STARTING YOUR DIAGNOSTICS ?
- A.
OHM OUT THE MOTOR FOR CONTINUITY
- B.
THERMOSTAT
- C.
POWER COMING IN TO THE AIR HANDLER
- D.
RUN CAPACITOR ON FAN MOTOR
Correct Answer
B. THERMOSTATExplanation
The first thing to check when starting the diagnostics is the thermostat. The customer mentioned that the fan has not been working for a whole day, so it is important to check if the thermostat is functioning properly. The thermostat controls the operation of the fan, so if it is not working correctly, it could be the cause of the issue with no cold air coming out of the vents. By checking the thermostat, the technician can determine if it needs to be repaired or replaced in order to restore the functionality of the fan.Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
Feb 29, 2012Quiz Created by
Mrallen37
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