NEW
Font size
WorksheetsBSE UNIT 2 LESSON 3 electricity generated BY hydro scheme
Total questions: 57
Worksheet time: 29mins
How is electricity generated according to the hydro scheme illustrated in the image?
By heating water to produce steam
By moving a conductor through a magnetic field using forces such as water
By using solar panels to convert sunlight into electricity
By burning fossil fuels to turn a turbine
Which of the following are considered fossil fuels?
Solar, wind, water
Oil, gas, coal
Biomass, geothermal, hydroelectric
Tidal, wave, nuclear
Why is nuclear power considered controversial?
It is not a reliable source of energy
It is too expensive to harness
Radioactivity remains active for hundreds of years
It is a renewable source of energy
Which of the following is NOT a form of renewable energy?
Solar
Coal
Wind
Water
What do coal-fired power stations use to turn water into steam which then drives a turbine?
Oil
Gas
Coal
Nuclear fusion
What is the primary process that nuclear power relies on to generate electricity?
Combustion
Fusion
Photovoltaic conversion
Wind power
Which type of power generation uses wind farms to produce 'clean' energy by turning a turbine with the power of the wind?
Coal
Oil and gas
Nuclear power
Renewable generation
Oil and gas power stations generate electricity by producing heat on:
Cooling
Burning
Fission
Photosynthesis
What is the function of the cooling tower in a power generation system?
To heat up the water before it enters the boiler
To convert water into steam for the turbine
To cool down the water that has been heated by the steam condenser
To generate electricity from steam
Where is the generator located in the steam power plant system schematic?
Next to the cooling tower
Before the HP turbine
Between the IP turbine and the LP turbine
After the steam condenser
What is the purpose of the HP turbine in a steam power plant?
To reheat the steam before it enters the IP turbine
To generate electricity directly from steam
To increase the pressure of the steam before it enters the boiler
To extract energy from high-pressure steam
What is the base SI unit of measurement for current?
Ohm (Ω)
Volt (V)
Ampere (A)
Watt (W)
What does a volt (V) represent in electrical terms?
Unit of power
Unit of electrical resistance
Unit of electric potential difference and electromotive force
Unit of current
Which unit is used to measure electrical resistance?
Ampere (A)
Watt (W)
Ohm (Ω)
Volt (V)
What is the SI unit of power?
Volt (V)
Ohm (Ω)
Ampere (A)
Watt (W)
What is produced when a magnet moves into a coil of wire?
Electric current
Electromagnetic induction
Magnetic field
Electric resistance
What happens to the direction of the induced voltage when the magnet is moved out of the coil again?
It remains the same
It is reversed
It is doubled
It disappears
What will be induced in the circuit if the coil is part of a complete circuit when a current is generated by electromagnetic induction?
Voltage
Resistance
Current
Magnetism
What does an electrical generator consist of?
A copper coil surrounded by a plastic casing
A copper coil surrounded by a magnet
A copper coil surrounded by a battery
A copper coil surrounded by a transformer
What are the two main types of power transformers mentioned in the text?
Step-up and step-down transformers
Autotransformers and differing equipment supplies
Current and safety isolation transformers
Single-phase and three-phase transformers
Which type of transformer is typically used for electric shavers?
Current transformer
Safety isolation transformer
Autotransformer
Step-down transformer
What voltage systems are autotransformers associated with in the text?
12V
110V
230V
400V
For what reason might industrial equipment not run on 12V, 110V, or 230V according to the text?
Because these voltages are too high
Because there is too much power (current)
Because there is insufficient power (current) to drive heavy loads
Because these voltages are not available in industrial settings
What voltage supply is mentioned as being used for larger electrical motors?
12V
110V
230V
Three-phase 400V
What do step-up and step-down transformers allow us to do with voltage and current in AC circuits?
Convert AC to DC
Only increase voltage
Easily multiply or divide voltage and current
Only decrease current
What happens to the voltage and current when a transformer 'steps up' AC voltage?
Voltage is reduced and current is increased
Voltage and current both increase
Voltage is increased and current is reduced
Voltage and current both decrease
What is the purpose of 'stepping down' current in transformers?
To increase wire resistance
To reduce wire resistance power losses along power lines
To increase power losses along power lines
To convert AC current to DC current
In a step-down transformer, what is the effect of having fewer turns in the secondary coil compared to the primary coil?
Increases both voltage and current
Reduces both voltage and current
Increases voltage but reduces current
Reduces voltage but increases current
What are three-phase transformers used for?
To cool down industrial machines
To generate, transmit and distribute electrical energy
To convert direct current to alternating current
To measure electrical resistance in circuits
Three-phase transformers are a type of:
Dynamic hydraulic device
Static electromagnetic device
Mobile mechanical device
Programmable logic controller
What voltage and phase is used for domestic power distribution in the UK according to the star distribution system?
230V single phase
400V three-phase & neutral
110V single phase
220V three-phase
What voltage and phase is used for commercial power distribution in the UK according to the star distribution system?
230V single phase
400V three-phase & neutral
110V single phase
220V three-phase
What voltage and phase is used for industrial power distribution in the UK according to the star distribution system?
230V single phase
400V three-phase & neutral
110V single phase
220V three-phase
What is the voltage level used for high voltage transmission in the power distribution system shown?
11 kV
33 kV
400 kV and/or 275 kV
132 kV
What voltage level is supplied to light industry medium factories in the diagram?
230 V
11 kV
33 kV
132 kV
Which component in the power distribution system steps down the voltage from high voltage transmission to low voltage distribution?
Generator transformer
Transformer at power generation
Low voltage distribution transformer
Transformer before small commercial and residential
What voltage level is used for heavy industry large factories according to the diagram?
230 V
11 kV
33 kV
132 kV
What is the characteristic of direct current (DC) as compared to the mains supply?
It varies over time
It travels in multiple directions
It is a constant value and only travels in one direction
It operates with transformers
Which type of current do batteries prefer?
Alternating current (AC)
Variable current
Pulsating current
Direct current (DC)
Can transformers operate with direct current (DC)?
Yes, transformers are designed for DC
No, transformers only operate with alternating current (AC)
Yes, but only with special types of DC
No, transformers can operate with both AC and DC equally well
Why is 110V used onsite in construction?
Because it is a higher voltage and more efficient
Because it is a standard voltage for all buildings
Because it is a safer voltage
Because it is the only voltage that can be used onsite
What is the voltage system known as that is used in construction sites?
Standard voltage system
High voltage system
Reduced voltage system
Single-phase voltage system
What is the typical electrical supply requirement for domestic properties?
100A with a 110V single-phase supply
100A with a 230V single-phase supply
100A with a 400V three-phase supply
More than 100A with a 230V single-phase supply
What type of electrical supply is needed for large factories or commercial premises like hotels or schools?
100A with a 230V single-phase supply
Less than 100A with a 230V single-phase supply
400V with a single-phase supply
More than 100A with a 400V, three-phase & neutral supply
On what principle does a fuse operate when excess current melts a wire within it?
Magnetism
Heat
Voltage
Resistance
What is a circuit breaker likely to have that engages when very high fault currents occur?
Voltage trip isolator
Magnetic trip isolator
Thermal trip isolator
Resistance trip isolator
What type of safety devices are RCDs considered to be?
Purely thermal
Purely magnetic
Purely electric
Purely mechanical
What is a residual current device (RCD)?
A device that measures electrical current
A device that provides additional protection for earth faults
A device that generates electricity
A device that stores electrical energy
What action does an RCD take upon detecting an earth fault?
It increases the current flow
It alerts the user with a sound
It turns off the current immediately
It repairs the fault automatically
How do RCDs protect against injury and death by electric shock?
By providing a safe path for electricity to flow
By strengthening the electrical circuit
By detecting an imbalance between the outgoing and incoming total current of a circuit
By insulating the electrical components
On what principle do RCDs work?
If there is a difference between the electricity coming in and going out, it must have gone somewhere
If there is a constant flow of electricity, the system is safe
If the electricity flow is uninterrupted, no fault exists
If there is a surplus of electricity, it indicates a fault
What does it indicate if an RCD trips because there is no current flowing in the neutral?
The current has gone down the earthing system or through a person
The electrical system is functioning correctly
The RCD is malfunctioning
There is a surplus of current in the live wire
What is the purpose of the earth electrode at the sub-station in the return earth path diagram?
To provide a path for electricity to flow back to the sub-station in case of a fault
To supply power to the electrical appliance
To protect the local sub-station from lightning strikes
To measure the electrical usage of the appliance
What is the path a fault current takes referred to as?
Circuit loop
Earth loop impedance
Resistance path
Ohm's pathway
How is earth loop impedance measured?
In volts (V)
In amperes (A)
In ohms (Ω)
In watts (W)
What should be done if the total sum of loop impedance is less than what is registered in the wiring regulations?
It should be increased to match the regulations.
It indicates a fault that must be corrected immediately.
It is considered safe and no action is needed.
A protective device should isolate the supply within the expected time.
What is the expected time within which a protective device should isolate the supply if the loop impedance is less than the registered value?
0.1 seconds
0.2 seconds
0.4 seconds
1.0 seconds
