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WHAT DO YOU KNOW ABOUT H.V.A.C.R.?

Total questions: 91

Worksheet time: 1hrs 9mins

Name
Class
Date
1.

What unit is used to measure the current flow in a circuit?

a)

Watts

b)

Ohms

c)

Volts

d)

Amps

2.

How is heat energy transferred by physical contact?

a)

Conduction

b)

Radiation

c)

Convection

d)

Induction

3.

What device is used to control air flow in supply air vents?

a)

Gate Valve

b)

Damper

c)

Crimpers

d)

Bracket

4.

What device is used to measure air?

a)

Thermocouple

b)

Anemometer

c)

Heat exchanger

d)

Psychrometer

5.

How is heat energy transferred through the movement of air?

a)

Radiation

b)

Conduction

c)

Convection

d)

Induction

6.

What unit is used to measure heat energy in the United States?

a)

PSI

b)

CFM

c)

AMP

d)

BTU

7.

What unit is used to measure the volume of air?

a)

PSI

b)

CFM

c)

AMP

d)

BTU

8.

What does a thermocouple measure?

a)

Voltage

b)

Temperature

c)

Humidity

d)

Current Flow

9.

How is heat energy transferred from the sun?

a)

Conduction

b)

Radiation

c)

Convection

d)

Induction

10.
How many square feet of floor tile is needed for a room 16' x 20'?
a)
320 cubic feet
b)
3200 square feet
c)
320 square feet
d)
32 square feet
11.
You have a board that measures 16' long, how many parts can you get if each part is 6" long?
a)
32
b)
35
c)
2.4
d)
3
12.
It costs a plumber $275 for labor and materials to install a toilet.  The materials cost is $110.  How much will he make in labor for a 2 bathroom house?
a)
$165
b)
$550
c)
$330
d)
$385
13.
Subtract these two fractions: 3/4 - 5/16
a)
2/8
b)
2/16
c)
7/16
d)
1/6
14.

The safety net responsible for trapping all harmful debris, moisture, and liquids from reaching the compressor and other vital parts of the A/C system. It separates gas from liquid, removes moisture, and filters out contaminants.

a)

Receiver/Drier

b)

Air Filter

c)

Cabin Air Filter

d)

Cold Air Intake

15.

In what state is the refrigerant when it exits the condenser?

a)

High pressure gas

b)

Low pressure gas

c)

High pressure liquid

d)

Low pressure liquid

16.

The receiver-drier is always located on the ________ pressure side of the refrigeration systems and is mounted ______________.

a)

low, next to the condenser or prior to the Thermal Xpansion Valve

b)

low, after the evaporator

c)

high, after the evaporator

d)

high, next to the condenser or prior to the Thermal Xpansion Valve

17.

as refrigerant moves through the condenser it goes from _____ to ________

a)

a Vapor to a Liquid

b)

a Liquid to a Vapor

c)

Low pressure Vapor to a low pressure vapor

d)

High pressure liquid to a low pressure liquid

18.
What does a TXV do?
a)
Cleans, dries and filters the refrigerant
b)
It controls the quantity of refrigerant entering the evaporator
c)
Allows for an increase in pressure and temperature prior to entering the condenser
d)
It acts as a safety device if the compressor is over pressuring the system
19.
If contamination within an air conditioning system is suspected and a flushing procedure is to be carried out what component should also be changed?
a)
Compressor
b)
Receiver Drier
c)
TXV
d)
Condenser
20.

Where would you expect to find a high pressure liquid within an AC system?

a)

Between the compressor and the Thermal Xpansion Valve

b)

Between the Thermal Xpansion Valve and the Evaporator

c)

Between the compressor and the condenser

d)

Between the Condenser and the Thermal Xpansion Valve

21.

The main components of the Air conditioning system are

a)

Thermistor, condenser, flow control and an evaporator.

b)

Fan blower, condenser, flow control and an evaporator.

c)

Compressor, condenser, flow control device and an evaporator.

d)

Drainage, condenser, flow control and an evaporator.

22.

In what state is the refrigerant when it exits the condenser?

a)

High pressure gas

b)

Low pressure gas

c)

High pressure liquid

d)

Low pressure liquid

23.
The two major functions of the compressor are to circulate refrigerant and to compress ____________. 
a)
Low-pressure refrigerant vapor into hot, high temperature vapor
b)
High-pressure refrigerant vapor into high-temperature, low temperature liquid
c)
Low-pressure refrigerant liquid into hot, high temperature vapor
d)
Low-pressure refrigerant liquid into hot, high temperature liquid
24.
The amount of heat needed to change states is known as _____ .
a)
Latent Heat
b)
Radiation
c)
fire
d)
cooking
25.
The ___________  the pressure on a liquid, the ________ its boiling point.
a)
higher, higher
b)
higher, lower
c)
lower, higher
26.
Where is the TXV installed in the refrigeration system? 
a)
At the condenser inlet and outlet tubes
b)
Between the evaporator outlet and the compressor inlet
c)
At the evaporator inlet and outlet fittings
d)
Between the evaporator outlet and condenser inlet
27.
How would you know the air con gas has been fully recovered from the system? 
a)
The gauge on the high pressure side reads a positive pressure
b)
The gauge on the low pressure side reads a negative pressure
c)
Both gauges read zero pressure at the end of the recovery process
d)
Both gauges read a positive pressure of 20 Bar at the end of the recovery process
28.
All of these are true about an air conditioner's evaporator EXCEPT:
a)
It removes humidity from the air.
b)
Refrigerant flows from the bottom to the top.
c)
Refrigerant enters the evaporator as a liquid.
d)
The refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.
29.
The air conditioning compressor acts as the ________ of the system, keeping refrigerant circulating during air conditioning system operation.
a)
Top
b)
Bottom
c)
Pump
d)
brain
30.
The amount of heat needed to raise the temperature of 1 pound of water 1 degree Fahrenheit (at sea level) 
a)
1 BTU
b)
convection
c)
Broil
d)
100 Kelvin
31.
____________ is the measurement of how hot or cold something feels.
a)
BTU
b)
freezing
c)
temperature
d)
comfort
32.

Where would you expect to find a high pressure liquid within an AC system?

a)

Between the compressor and the Thermal Xpansion Valve

b)

Between the Thermal Xpansion Valve and the Evaporator

c)

Between the compressor and the condenser

d)

Between the Condenser and the Thermal Xpansion Valve

33.

What does a Thermal Xpansion Valve do?

a)

Cleans, dries and filters the refrigerant

b)

It controls the quantity of refrigerant entering the evaporator

c)

Allows for an increase in pressure and temperature prior to entering the condenser

d)

It acts as a safety device if the compressor is over pressuring the system

34.

If contamination within an air conditioning system is suspected and a flushing procedure is to be carried out what component should also be changed?

a)

Compressor

b)

Receiver Drier

c)

Thermal Xpansion Valve

d)

Condenser

35.

Which of the following would require system recovery to replace?

a)

driven plate

b)

pulley

c)

clutch bearing

d)

shaft seal

36.

What is the main cause for retrofitting the A/C system.

a)

obsolete refrigerant

b)

obsolete refrigerant oil

c)

poor performance

d)

compressor leakage

37.

WHAT IS THE ROLE OF THE COMPRESSOR

a)

COMPRESS LIQUID REFRIGERANT

b)

CREATE PRESSURE DIFFERENCE

c)

THE HEART OF THE REFRIGERATION CYCLE

d)

METERS REFRIGERANT

38.

WHAT IS THE ROLE OF THE CONDENSER

a)

ABSORBS HEAT

b)

METERS REFRIGERANT

c)

CONDENSES GAS

d)

REJECTS HEAT

39.

WHAT IS THE ROLE OF THE METERING DEVICE

a)

COMPRESS LIQUID

b)

ABSORB HEAT

c)

METERS FLOW OF REFRIGERANT

d)

JUST LOOKS GOOD

40.

A COMPRESSOR CANNOT COMPRESS A (a)  

41.

SUPERHEAT IS MEASURED ON WHAT SIDE OF THE SYSTEM

a)

RIGHT

b)

LEFT

c)

HIGH

d)

LOW

42.

SUB COOLING IS MEASURED ON WHICH SIDE OF THE SYSTEM

a)

LOW

b)

LEFT

c)

RIGHT

d)

HIGH

43.

FIXED ORIFICE, TXV AND CAPILLARY TUBE ARE EXAMPLES OF WHAT

a)

FLAVORED DRINKS

b)

METERING DEVICES

c)

COMPRESSOR TYPES

d)

TYPES OF EVAPORATORS

44.

SCROLL, ROTARY, SCREW,RECIPROCATING AND CENTRIFUGAL ARE TYPES OF WHAT

a)

COMPRESSORS

b)

AUTOMOBILE ENGINES

c)

CONDENSORS

d)

EVAPORATORS

45.

THE COPPER LINE FROM THE COMPRESSOR TO THE CONDENSER IS CALLED THE

a)

LIQUID LINE

b)

EXPANSION LINE

c)

DISCHARGE LINE

d)

SUCTION LINE

46.

THE LINE FROM THE CONDENSER TO THE METERING DEVICE IS THE

a)

SUCTION LINE

b)

DISCHARGE LINE

c)

EXPANSION LINE

d)

LIQUID LINE

47.

Superheating will be found in which of the following locations?

a)

Discharge line

b)

Liquid line

c)

Suction line

d)

Expansion line

48.

Refrigerant changes from vapor to a liquid in which component?

a)

Liquid line

b)

Evaporator

c)

Suction line

d)

Condenser

49.

Which of the following will cause the compressor work harder?

a)

High suction pressure

b)

Low suction pressure

c)

Low charge

d)

Low load

50.

The area between the valve plate and the top of the piston at top dead center is _____?

a)

Discharge valve

b)

Suction valve

c)

Clearance volume

d)

Wrist pin

51.

What is the function of Evaporator in an AC refrigeration cycle?

a)

Absorbs heat from the room

b)

Compresses gas

c)

Reduces temperature of refrigerant

d)

Reduces temperature of refrigerant

52.

What is the function of Compressor in an AC refrigeration cycle?

a)

Absorbs heat from the room

b)

Compresses gas to ensure circulation

c)

Reduces temperature of refrigerant

d)

Converts gas into liquid

53.
It condenses the refrigerant vapor to liquid
a)
Condensor
b)
Compressor
c)
Evaporator
d)
Expansion Valve
54.
reduces the pressure of the refrigerant liquid and thus cools the liquid
a)
Expansion Valve
b)
Evaporator
c)
Compressor
d)
Condensor
55.

What is the Function of Condenser in an AC Refrigeration Cycle ?

a)

Compresses the gas to ensure circulation

b)

Reduces the temperature of the refrigerant

c)

Converts gas into liquid

d)

Absorbs heat from the room

56.

What is the compressor known as?

a)

The heart of the system.

b)

The leg of the system.

c)

The control system.

d)

The air system.

57.

How many BTU’s per hour are equivalent to one ton of refrigeration?

a)

554

b)

15,000

c)

12,000

d)

200

58.

In a Split AC, “Evaporator” is placed in …….

a)

Indoor Unit (IDU)

b)

Outdoor Unit (ODU)

c)

Both IDU and ODU

d)

Evaporator is not a component of Split AC

59.

Cooling Capacity of an AC is also known as ………

a)

Star Rating

b)

Tonnage of the AC

c)

ISEER Rating

d)

Units per year

60.

What is the function of Evaporator in an AC refrigeration cycle?

a)

Absorbs heat from the room

b)

Compresses gas

c)

Reduces temperature of refrigerant

d)

Reduces temperature of refrigerant

61.

What is the function of Capillary Tube in an AC refrigeration cycle?

a)

Reduces temperature of refrigerant

b)

Compresses gas to ensure circulation

c)

Increases temperature of refrigerant

d)

Converts liquid into gas

62.

What is the benefit of an AC with the digital converter compressor?

a)

It reduces the temperature of the refrigerant

b)

It reduces maintenance of condenser and evaporator

c)

It reduces the power consumption

d)

It reduces the speed of compressor

63.

If a standard room is 14 feet long and 11 feet wide, what is the size of AC you will recommend?

a)

1 Ton

b)

1.5 Ton

c)

2.0 Ton

d)

1.5 or 2.0 Ton, whichever is there in stock

64.

What is an example of a pilot duty control ?

a)

The main breaker of an electrical panel

b)

A motor starter

c)

A low voltage thermostat

d)

A defrost timer

65.

What does lock rotor current means ?

a)

Problem cause by defective motor

b)

Maximum starting torque of an electric motor

c)

The relation between working current and theoretical current of a motor

d)

The current inrush pulled by a motor at start up

66.

What is the purpose of a grounding circuit on a high current load ?

a)

Safety

b)

To lower the magnetic field emissions

c)

To reduce power consumption

d)

To improve efficiency

67.

What does AHU stands for in HVAC?

a)

Air Handler Unit

b)

Air Handling Unit

c)

Air Humidifier Unit

d)

None of the above

68.

Used to measure High/Liquid side

a)

True

b)

False

69.

Used to measure High/Liquid side

a)

True

b)

False

70.

Identify the following

a)

Water Pump

b)

Air pump

c)

Vacuum pump

d)

Refrigerant pump

71.

Identify the following

a)

Capacitor

b)

Contactor

c)

Compressor

d)

Conductor

72.

What is the yellow hose used for

a)

High side

b)

Low Side

c)

Service

d)

Vapor side

73.

A HIGH LIMIT SWITCH IS A SAFETY IN A FURNACE THAT PREVENTS THE FURNACE HEAT EXCHANGER FROM OVER HEATING

a)

TRUE

b)

FALSE

74.

PURGING WITH NITROGEN IS NOT REQUIRED WHEN BRAZZING

a)

TRUE

b)

FALSE

75.

THE PART OF A HEAT PUMP THAT REVERSES THE FLOW OF REFRIGERANT WHEN YOU SWITCH FROM COOLING TO HEATING

a)

REFRIGERANT SWITCH

b)

REVERSING VALVE

c)

KING VALVE

d)

THERMISTOR

76.

THIS PART TAKES REFRIGERANT FROM A HIGH PREASSURE LIQUID TO A LOW PREASSURE LIQUID

a)

EVAPORATOR

b)

COMPRESSOR

c)

CONDENSOR

d)

TXV VALVE

77.

THE EVAPORATOR COIL REMOVES HEAT FROM THE AIR IN A HOME AND TRANSFERS IT TO THE REFRIGERANT

a)

TRUE

b)

FALSE

78.

WHEN PULLING A VACUUM ON A SYSTEM YOU DO NOT NEED A MICRON GUAGE, 1 HOUR IS ENOUGH

a)

TRUE

b)

FALSE

79.

THIS DEVICE MEASURES THE WATER TEMPERATURE IN A BOILER

a)

THERMISTOR

b)

AQUA STAT

c)

BACKFLOW PREVENTOR

d)

THERMOSTAT

80.

KEEPING AS MUCH HEAT OF A TXV VALVE IS CRITICAL WHEN BRAZING AT THE INDOOR COIL

a)

TRUE

b)

FALSE

81.

THE HIGH SIDE OF A COOLING SYSTEM IS REPRESENTED BY WHICH COLOR ON YOUR GUAGES

a)

RED

b)

BLUE

82.

HOW MANY CFM'S ARE IN A TON OF COOLING

a)

300

b)

250

c)

400

d)

450

83.

IT IS IMPORTANT TO REDUCE DUCT SIZES IN A TRUNK LINE

a)

TRUE

b)

FALSE

84.

IF A GAS FURNACE LIGHTS BRIEFLY AND SHUTS DOWN WHAT COULD BE THE MOST LIKELY CULPRIT

a)

BAD TXV

b)

BAD DUCTWORK

c)

BAD IGNITOR

d)

DIRTY FLAME SENSOR

85.

PVC GLUE CURES FASTER IN A COLD ENVIRORMENT

a)

TRUE

b)

FALSE

86.

WHAT IS A PROPER TEMPERATURE SPLIT IN A/C

a)

12-15 DEGREES

b)

24-26 DEGREES

c)

18-20 DEGREES

d)

30-32 DEGREES

87.

IF YOUR SUPPLY TEMP IN A/C IS 62 AND YOUR RETURN IS 76 WHAT SHOULD YOU DO TO YOUR FAN SPEED

a)

RAISE IT

b)

LOWER IT

c)

LET IT GO

88.

IF YOUR SUPPLY TEMP IN HEATING 150 AND YOUR RETURN TEMPERATURE IS 65 WHAT SHOULD YOU DO TO YOUR FAN SPEED

a)

RAISE IT

b)

LOWER IT

89.

A BAD TXV VALVE WILL SHOW VERY LOW PREASUURE ON THE LOW SIDE OF THE GUAGES

a)

TRUE

b)

FALSE

90.

What unit is used to measure the current flow in a circuit?

a)

Watts

b)

Ohms

c)

Volts

d)

Amps

91.

Which ancient culture was the first to combine frozen ice and milk for dessert?

a)

Egyptian

b)

Chinese

c)

Greek

d)

Roman

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