WorksheetsApprentices Assessment on Power Systems
Total questions: 17
Worksheet time: 9mins
What is the primary purpose of a power generation station?
To distribute electricity
To generate electrical energy from various sources
To store electrical energy
To transform voltage levels
Which of the following is NOT a renewable source of energy?
Solar power
Wind power
Natural gas
Hydropower
What type of power plant uses steam produced from boiling water to generate electricity?
Hydroelectric plant
Thermal power plant
Nuclear power plant
Wind turbine
What is the typical voltage range for high-voltage transmission lines?
0-20 kV
20-100 kV
100-400 kV
Above 400 kV
Which of the following materials is commonly used for overhead transmission line conductors?
Iron
Steel
Aluminium
Copper
Which type of distribution system has a single path for electrical power to flow from the substation to consumers?
Radial system
Ring main system
Looped system
Mesh system
What is the primary purpose of a distribution transformer?
To generate electricity at high voltages
To step down voltage for consumer use
To store electrical energy
To maintain voltage levels in transmission lines
What is the primary purpose of earthing in electrical systems?
To enhance voltage levels
To provide a path for fault currents to ground
To increase the efficiency of electrical devices
To prevent power surges
Which type of earthing uses a copper plate buried in the ground?
Rod earthing
Plate earthing
Pipe earthing
Strip earthing
The average resistance of the human body is approximately:
500 ohms
1000 ohms
1500 ohms
2000 ohms
What is the recommended grounding resistance for effective earthing?
As low as possible
As high as possible
Always zero
None of the above
Which mixture is preferred for filling around an earth electrode?
Bone meal mixture
Coal salt mixture
Saw dust sand mixture
Lime-sand mixture
The earth's potential is generally considered to be:
Infinite
Supply voltage
1 volt
Zero
Which type of earthing is suitable for areas with rocky soil?
Rod earthing
Plate earthing
Strip earthing
Pipe earthing
In a TN-C-S system, what is the role of the neutral conductor?
Acts as a live wire.
Returns earth fault currents to the source.
Provides additional voltage.
Connects all appliances directly to the earth.
What is the minimum size of an earth continuity conductor in electrical installations?
Not less than 6 mm² for copper.
Not less than half of the largest conductor size used.
Not less than 10 mm² for aluminum.
No minimum size required.
The maximum allowable resistance to ground for an earthing system according to IEE regulations is typically:
Less than 5 ohms
Less than 10 ohms
Less than 15 ohms
Less than 20 ohms
