WorksheetsUnit 202 - Scientific Principles within RAC and HP Systems
Total questions: 17
Worksheet time: 9mins
Which of the following is the base unit of length used in the SI system of measurement ?
Millimetre
Centimetre
Metre
Kilometre
When using the SI system of measurement, which temperature scale must be used?
Baume
Kelvin
Rankine
Celsius
Which of the following is the speed at which molecules move about in a substance ?
Temperature
Internal Energy
Enthalpy
Entropy
Zero degrees on the celsius temperature scale was established by using which of the following values as a reference point ?
Fusion point of mercury at atmospheric pressure
Boiling point of water at 300 microns
Vaporisation point of mercury at 3000 microns
Melting point of ice at atmospheric pressure
The temperature known as absolute zero is...
The temperature used for organic food storage
300 degrees below the melting point of ice
the lowest possible temperature that can be attained
created when gas molecules approach the speed of light
The temperature of 200k has which of the following values when converted to Celsius ?
Minus 73°c
Minus 50°c
Minus 30°c
Minus 10°c
Which of the following describes the second law of thermodynamics ?
Heat and work are interchangeable
When work is done on a substance, heat is produced
Heat Flows from hot to cold
evaporator temperatures must be lower than air temperatures
Overheating in an unlubricated fan bearing is an application of which of the thermodynamic law ?
Boyles law
Charles law
First Law
Second Law
in order that heat energy can transfer between 2 bodies, which of the following conditions is necessary ?
there must be a temperature difference between the bodies
the bodies must be in contact
the bodies must be apart
there must be a pressure difference between the bodies
Heat transfer by convection can only take place...
Between two gases
between solids and liquids
in liquids and gases
in a vacuum
When a force of 1 Newton is used to move an object a distance of 1 Metre, the energy expended is known as...
Joule
Pascal
Watt
Calorie
In the SI system, the term used to describe at which heat flows into a substance is known as...
Watt
Joule
Enthalpy
Entropy
In the SI system of units, the description "power" is the name for which of the following?
N/m/s2
Nm/s
kJ/kg
kJ/kgK
The rate at which energy is consumed is called ?
Power
Kwh
Pressure
kNm
What is the power input to the compressor if 0.6kg's of a gas has its enthalpy changed by 20kj/kg when flowing through a compressor ?
1.2kW
1.2kj
12kW
12kj
When a substance has a latent head added, which of the following values remains constant during the process?
Temperature
Enthalpy
Volume
Entropy
if a substance undergoes a sensible heat process, which of the following statements applies?
Temperature glide will take place
it causes a change in temperature but not in phase
flash gas may be formed
it causes a change in phase, but not in temperature
