ICIT: Quiz on Three-Phase Systems

What is the star point in a star-connected system known as?

• Neutral point

• Voltage point

• Phase point

• Line point

In a star-connected load, what is the relationship between line voltage and phase voltage?

• V_L= V_P + 3

• V_L = V_P x √3

• V_L = V_P / √3

• V_L = V_P - 3

What is the phase current in a star-connected load denoted by?

• V_L

• V_P

• I_P

• I_L

In a delta-connected load, how are the line currents related to the phase currents?

• I_L = I_P / 3

• I_L = 3 x I_P

• I_L = I_P

• I_L = I_P x √3

What is the line voltage in a delta-connected load equal to?

• V_P

• V_P x 3

• V_L / 3

• V_L

What is the total power dissipated in a balanced resistive load connected in star?

• P = 3 x V_L * I_L

• P = V_P x I_P

• P = 3 x I_P² * R

• P = V_L x I_P

How many degrees apart are line voltages in a three-phase system?

• 120°

• 360°

• 90°

• 180°

What is the equivalent of 1 kWh in joules?

• 3,600,000 J

• 1,000,000 J

• 1,000 J

• 3,600 J

In a star-connected load, what is the phase voltage denoted by?

• I_L

• V_P

• V_L

• I_P

What is the power factor for a resistive load?

• 0.5

• 1

• 0.8

• 0