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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is the total real power for a balanced three-phase system with VL = 400 V, IL = 30 A, and a power factor of 0.9?
💡 Hint: Use the formula Ptotal = 3 × VL × IL × PF.
Question 2
Easy
If apparent power is 17 kVA and power factor is 0.9, what is the total real power?
💡 Hint: Real power can be calculated by multiplying apparent power by power factor.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the formula for calculating total real power in a three-phase system?
- Ptotal = VL × IL
- Ptotal = 3 × VL × IL × PF
- Ptotal = VL + IL
💡 Hint: Remember that 'P' stands for real power.
Question 2
True or False: Reactive power does useful work in the circuit.
- True
- False
💡 Hint: Think about the roles of different types of power.
Solve 2 more questions and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
A balanced three-phase load has an IL of 15 A and PF of 0.85. If VL is 440 V, calculate the total real, apparent, and reactive power using the appropriate formulas.
💡 Hint: Start by calculating the total real power using the power factor.
Question 2
In a star connection, if the line voltage is 480 V and the line current is 12 A with a PF of 0.7, verify your calculations involving real and reactive power, confirming your finding about apparent power.
💡 Hint: Make sure to derive sin(ϕ) after finding PF.
Challenge and get performance evaluation