Electrical -1 end term questions

What is the phase difference between any two phases in a three-phase system?

• 30 degrees
• 60 degrees
• 90 degrees
• 120 degrees

Which type of power supply is more efficient for transmitting power over long distances?

• Single phase
• Three phase
• Both are equally efficient
• None of the above

In a star connection, the line voltage is

• Equal to the phase voltage.
• √3 times the phase voltage.
• Half the phase voltage.
• Three times the phase voltage.

What is the primary need for protective devices in electrical circuits?

• To stabilize voltage
• To ensure safety by interrupting fault currents
• To increase circuit efficiency
• To reduce circuit complexity

Which of the following is a rewireable fuse?

• HRC fuse
• Cartridge fuse
• KIT KAT fuse
• D-type fuse

Which circuit breaker is suitable for industrial applications with higher currents?

• MCB
• MCCB
• RCCB
• HRC fuse

Which of the following is NOT a component of an earthing system?

• Earth electrode
• Earth wire
• Circuit breaker
• Grounding pit

Which factor significantly affects the efficiency of an earthing system?

• Material of the earth electrode
• Length of the wiring
• Ambient temperature
• Color coding of wires

Which of the following is NOT a renewable energy source?

• Wind
• Solar
• Geothermal
• Natural gas

Which of the following is the primary fuel used in thermal power plants?

• Natural gas
• Coal
• Nuclear fuel
• Solar energy