WorksheetsPrinciples of Combustion Worksheet part 5
Total questions: 45
Worksheet time: 23mins
What are the three components required for fire according to the principles of combustion?
Fuel, Oxygen, Heat
Water, Oxygen, Heat
Fuel, Water, Light
Oxygen, Water, Spark
Combustion is a chemical reaction with which element?
Nitrogen
Oxygen
Carbon
Hydrogen
What is produced when propane, oxygen, and a spark are combined?
Water
Smoke
Flame
Ice
Which of the following is described as one of the most destructive elements that exists?
Water
Fire
Air
Earth
Which of the following is a common gas used in plumbing situations?
Oxygen
Natural gas
Carbon dioxide
Nitrogen
What is the relative density of natural gas?
0.58
1.78
2.0
1.00
Which gas has the highest calorific value among natural gas, propane, and butane?
Butane
Propane
Natural gas
Methane
What is the approximate air/gas ratio for propane?
24:1
10:1
30:1
15:1
Which gas produces the highest flame temperature?
Butane
Propane
Natural gas
Methane
What is the calorific value of natural gas?
38.5MJ/m³
95.0MJ/m³
121.5MJ/m³
50.0MJ/m³
Which gas is commonly used in domestic properties for boiler and cooker fuel, but is not hot enough for soldering?
Butane
Propane
Natural gas
Oxygen
What is propane commonly used for?
Barbecues
Caravan boiler and cooking
Welding
Lighting
Which gas is commonly used in barbecues due to its high calorific value?
Natural gas
Propane
Butane
Methane
Why is ventilation required when using natural gas, propane, or butane?
To increase temperature
To prevent gas leaks
For safety in certain applications
To reduce cost
Which gas is too hot for soldering?
Natural gas
Propane
Butane
Helium
What is the unit for electromotive force (emf) in electricity?
Volt
Ampere
Ohm
Watt
Which unit is used to measure electric current?
Ohm
Ampere
Volt
Watt
What does resistance in an electrical circuit oppose?
Voltage
Power
Flow of current
Frequency
Which symbol is commonly used to represent current in equations?
V
R
I
P
The ohm is the unit of which electrical property?
Voltage
Current
Resistance
Power
What is the unit of power for an appliance?
Joules (J)
Volts (V)
Watts (W)
Amperes (A)
Which unit is used to measure electrical energy, but is generally not used because it is so small?
Watts (W)
Joules (J)
Volts (V)
Amperes (A)
How is electricity usage typically measured for billing purposes today?
In joules
In amperes
In kilowatt hours
In volts
What does the "W" stand for in the relationship between watts, amps, and volts?
Watts
Wire
Work
Weight
In the triangle diagram showing the relationship between watts, amps, and volts, what does the "A" represent?
Amps
Area
Angle
Atom
What does the "V" stand for in the triangle diagram about the principles of electricity?
Volts
Velocity
Volume
Value
If an appliance needs 3kW in a domestic property, what is the fuse size?
12.5 amp.
10 amp.
15 amp.
8 amp.
In a domestic property, an appliance has a fuse size of 3 amp. What is the maximum power rating of the appliance?
720w or 0.72kW.
600w or 0.6kW.
900w or 0.9kW.
480w or 0.48kW.
An appliance has a 5 amp fuse and needs 1.2kW of power. What is the voltage required?
240v.
120v.
220v.
110v.
What does Ohm’s Law show the relationship between?
Voltage, current, and resistance
Power, energy, and time
Frequency, wavelength, and speed
Capacitance, inductance, and resistance
In the Ohm’s Law triangle, what does the letter "V" stand for?
Voltage
Velocity
Volume
Variable
Which letter in the Ohm’s Law triangle represents resistance?
R
V
I
S
What is the symbol for current in the Ohm’s Law triangle?
I
V
R
C
What would be the resistance of a domestic appliance if the fuse size was 3 amp?
80 ohms.
60 ohms.
100 ohms.
30 ohms.
What is the fuse size for a domestic appliance which has 1,200 ohms resistance?
0.2 amp.
2 amp.
12 amp.
0.5 amp.
If an appliance had a fuse rated at 13 amp and the resistance was 32 ohms, what would the voltage be?
415v.
320v.
130v.
52v.
What does AC stand for in the context of electricity?
Alternating current
Absolute current
Active current
Atomic current
What is the frequency of mains electricity in the UK?
60 Hz
40 Hz
50 Hz
30 Hz
What does Hz stand for in the context of electricity?
Hertz, which means cycles per second
High voltage
Heat zone
Heavy zero
What is the main type of electricity supplied to homes in the UK?
Direct current (DC)
Alternating current (AC)
Static electricity
Solar electricity
What does the diagram represent?
The waveform of alternating current (AC)
The waveform of direct current (DC)
The waveform of static electricity
The waveform of a battery
What does DC stand for in the context of electricity?
Direct current
Dynamic charge
Double circuit
Digital current
Which of the following is used to create a simple battery as described in the principles of electricity?
Dissimilar metals in a dilute acid solution
Identical metals in pure water
Plastic rods in oil
Glass rods in air
In a simple battery, what happens to the anode?
It is eaten away by the cathode
It becomes positively charged
It remains unchanged
It turns into a gas
Which terminal is the positive terminal in a typical battery?
Cathode
Anode
Zinc rod
Air space
