Refrigeration Operator Final Exam
Questions and Answers
The type of instrument used to measure temperature are - Answer- liquid in glass
thermometers
By metal thermometers
Pyrometers
The expansion valve in a refrigeration system is located - Answer- Between the receiver
and the evaporator
The coefficient of expansion for gases is practically the same for different gases and is -
Answer- Practically the same for different temperatures
The change in links per unit length per degree rise and temperatures is also known as -
Answer- The coefficient of linear expansion
He is a form of energy which may be transferred from one body to another by virtue of
difference in - Answer- Temperature
The______ is the basic unit of all energy - Answer- Joule
1 KJ is equal to - Answer- 1000 joules
One Newton meter is - Answer- Equal to 1 Joule.
The specific heat of a substance is the quantity of heat required to raise the temperature
of a unit mass of the substance by - Answer- 1°C
The quantity of heat absorbed by a substance when it is increased in temperature
depends on - Answer- Temperature rise, the mass of the substance and the specific
heat of the substance
The change in length per unit length per degree raise in temperature is known as
though - Answer- Coefficient of linear expansion
According to the volume magic expansion of solids due to the increase in temperature,
when a body is heated, it will expand - Answer- Along all its dimensions
Unit of work in the SI system - Answer- Joule
, One watt is equal to - Answer- Joule/second
Unit of Power in the SI system - Answer- Watt
One kilopascal is equal to - Answer- 1 kN/m²
Code for safe design of boilers and pressure vessels - Answer- CSA B51
Code for safe design of refrigeration and air conditioning systems - Answer- CSA B-52
Units of measurement for specific humidity - Answer- Kg/kg (lb/lb) of air
pneumatic humidistats - Answer- Human hair element, membrane element, bi-wood
element
By keeping the temperature of spray water of an air conditioning system below the
dewpoint of the incoming air, the air is - Answer- Air is dehumidified
Control of outside air intake in air conditioning - Answer- A fixed quantity of outdoor air
is admitted by a two-position damper when the fan is in operation
System capable of heating, cooling, humidification, dehumidification, and cleaning of air
- Answer- Unitary systems or air washers
Percentage of moisture in air compared to maximum capacity - Answer- Relative
humidity
Relative humidity of air - Answer- Percentage of moisture in the air compared to the
maximum amount of moisture the air is capable of holding at the stated temperature
Device for measuring relative humidity - Answer- Chronometer
Dewpoint - Answer- Temperature at which water vapour will start to condense out of the
air
Relative humidity is - Answer- The ratio of water vapor in the air compared to the total
amount of water vapor at the air could contain at any given temperature
Air is approximately______ composition by volume - Answer- 21% 02 and 79% N2
The most efficient method of condenser cooling is - Answer- water cooled
The function of the condenser in refrigeration compression system is - Answer- To cool
the hot compressed refrigerant vapor until it condenses to a liquid
Questions and Answers
The type of instrument used to measure temperature are - Answer- liquid in glass
thermometers
By metal thermometers
Pyrometers
The expansion valve in a refrigeration system is located - Answer- Between the receiver
and the evaporator
The coefficient of expansion for gases is practically the same for different gases and is -
Answer- Practically the same for different temperatures
The change in links per unit length per degree rise and temperatures is also known as -
Answer- The coefficient of linear expansion
He is a form of energy which may be transferred from one body to another by virtue of
difference in - Answer- Temperature
The______ is the basic unit of all energy - Answer- Joule
1 KJ is equal to - Answer- 1000 joules
One Newton meter is - Answer- Equal to 1 Joule.
The specific heat of a substance is the quantity of heat required to raise the temperature
of a unit mass of the substance by - Answer- 1°C
The quantity of heat absorbed by a substance when it is increased in temperature
depends on - Answer- Temperature rise, the mass of the substance and the specific
heat of the substance
The change in length per unit length per degree raise in temperature is known as
though - Answer- Coefficient of linear expansion
According to the volume magic expansion of solids due to the increase in temperature,
when a body is heated, it will expand - Answer- Along all its dimensions
Unit of work in the SI system - Answer- Joule
, One watt is equal to - Answer- Joule/second
Unit of Power in the SI system - Answer- Watt
One kilopascal is equal to - Answer- 1 kN/m²
Code for safe design of boilers and pressure vessels - Answer- CSA B51
Code for safe design of refrigeration and air conditioning systems - Answer- CSA B-52
Units of measurement for specific humidity - Answer- Kg/kg (lb/lb) of air
pneumatic humidistats - Answer- Human hair element, membrane element, bi-wood
element
By keeping the temperature of spray water of an air conditioning system below the
dewpoint of the incoming air, the air is - Answer- Air is dehumidified
Control of outside air intake in air conditioning - Answer- A fixed quantity of outdoor air
is admitted by a two-position damper when the fan is in operation
System capable of heating, cooling, humidification, dehumidification, and cleaning of air
- Answer- Unitary systems or air washers
Percentage of moisture in air compared to maximum capacity - Answer- Relative
humidity
Relative humidity of air - Answer- Percentage of moisture in the air compared to the
maximum amount of moisture the air is capable of holding at the stated temperature
Device for measuring relative humidity - Answer- Chronometer
Dewpoint - Answer- Temperature at which water vapour will start to condense out of the
air
Relative humidity is - Answer- The ratio of water vapor in the air compared to the total
amount of water vapor at the air could contain at any given temperature
Air is approximately______ composition by volume - Answer- 21% 02 and 79% N2
The most efficient method of condenser cooling is - Answer- water cooled
The function of the condenser in refrigeration compression system is - Answer- To cool
the hot compressed refrigerant vapor until it condenses to a liquid
