Transmission and Distribution System Quiz

What is the primary function of electrical power transmission?

• Distribute electricity to consumers

• Transform voltage at substations

• Store electricity in power plants

• Generate electrical energy

What is the typical voltage generated in advanced countries for electrical power transmission?

• 33kV

• 11kV

• 66kV

• 132kV

What is the purpose of a step-up transformer in the transmission of electricity?

• Distribute voltage

• Reduce voltage

• Increase voltage

• Store voltage

What is the voltage level at which distribution companies like MERALCO bring electricity to homes?

• 33kV

• 132kV

• 66kV

• 11kV

What type of system is commonly used for secondary distribution in most countries?

• 3-phase, 4 wire system (STAR)

• 2-phase, 2 wire system

• 3-phase, 3 wire system (DELTA)

• Single-phase system

What is the formula for calculating percentage voltage regulation?

• (VR - VS) / VR

• (VR - VS) / VS

• (VS - VR) / VR

• (VS + VR) / VR

What is the efficiency of an overhead 3-d Transmission line delivering 5000kw at 22kv at 0.8 p.f lagging?

• 85.25%

• 93.94%

• 81.67%

• 76.12%

According to Kelvin's Law, what is the most economical area of conductor based on?

• Atmospheric conditions

• Total annual cost of transmission

• Conductor material

• Line voltage

What is the phenomenon known as corona in an overhead transmission line?

• Reduction in conductor size

• Production of ozone gas

• Power loss

• Voltage drop

What factor affects the occurrence of corona in an overhead transmission line?

• Spacing between conductors

• Atmosphere

• Line voltage

• Conductor size